kopia lustrzana https://github.com/micropython/micropython-lib
applied codeformat
rkompass
rodzic
8698e33a77
commit
c8b81047e8
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@ -21,13 +21,16 @@ def accumulate(iterable, func=lambda x, y: x + y, initial=None):
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total = func(total, element)
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yield total
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# chain('abcd',[],range(5))) --> 'a' 'b' 'c' 'd' 0 1 2 3 4
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class chain:
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def __init__(self, *iterables):
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self.iterables = list(iterables)
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self.it = iter([])
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def __iter__(self):
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return self
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def __next__(self):
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while True:
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try:
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@ -38,12 +41,14 @@ class chain:
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continue
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except IndexError:
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raise StopIteration
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# chain.from_iterable(['ABC', 'DEF']) --> 'A' 'B' 'C' 'D' 'E' 'F'
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@staticmethod
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def from_iterable(iterables):
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def from_iterable(iterables):
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for it in iterables:
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yield from it
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# combinations('ABCD', 2) --> ('A','B') ('A','C') ('A','D') ('B','C') ('B','D') ('C','D')
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def combinations(iterable, r):
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pool = tuple(iterable)
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@ -65,6 +70,7 @@ def combinations(iterable, r):
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indices[j] = indices[j - 1] + 1
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yield tuple(pool[i] for i in indices)
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# combinations_with_replacement('ABC', 2) --> ('A','A') ('A','B') ('A','C') ('B','B') ('B','C') ('C','C')
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def combinations_with_replacement(iterable, r):
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pool = tuple(iterable)
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@ -84,21 +90,24 @@ def combinations_with_replacement(iterable, r):
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indices[index:] = [indices[index] + 1] * (r - index)
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yield tuple(pool[i] for i in indices)
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# compress('ABCDEF', [1,0,1,0,1,1]) --> A C E F
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def compress(data, selectors):
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return (d for d, s in zip(data, selectors) if s)
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# count(4, 3) --> 4 7 10 13 16 19 ....
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def count(start=0, step=1):
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while True:
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yield start
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start += step
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# cycle('abc') --> a b c a b c a b c a ....
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def cycle(iterable):
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try:
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len(iterable)
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except TypeError: # len() not defined: Assume p is a finite iterable: We cache the elements.
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except TypeError: # len() not defined: Assume p is a finite iterable: We cache the elements.
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cache = []
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for i in iterable:
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yield i
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@ -107,6 +116,7 @@ def cycle(iterable):
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while iterable:
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yield from iterable
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# # dropwhile(lambda x: x<5, [1,4,6,4,1]) --> 6 4 1
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def dropwhile(predicate, iterable):
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it = iter(iterable)
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@ -117,6 +127,7 @@ def dropwhile(predicate, iterable):
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for x in it:
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yield x
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# filterfalse(lambda x: x%2, range(10)) --> 0 2 4 6 8
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def filterfalse(predicate, iterable):
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if predicate is None:
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@ -125,38 +136,48 @@ def filterfalse(predicate, iterable):
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if not predicate(x):
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yield x
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# groupby('aaaabbbccdaa'))) --> ('a', gen1) ('b', gen2) ('c', gen3) ('d', gen4) ('a', gen5)
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# where gen1 --> a a a a, gen2 --> b b b, gen3 --> c c, gen4 --> d, gen5 --> a a
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def groupby(iterable, key=None):
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it = iter(iterable)
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keyf = key if key is not None else lambda x: x
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def ggen(ktgt):
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nonlocal cur, kcur
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while kcur == ktgt:
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yield cur
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try:
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cur = next(it); kcur = keyf(cur)
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cur = next(it)
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kcur = keyf(cur)
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except StopIteration:
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break
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kcur = kold = object() # need an object that never can be a returned from key function
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break
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kcur = kold = object() # need an object that never can be a returned from key function
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while True:
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while kcur == kold: # not all iterables with the same (old) key were used up by ggen, so use them up here
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while (
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kcur == kold
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): # not all iterables with the same (old) key were used up by ggen, so use them up here
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try:
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cur = next(it); kcur = keyf(cur)
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cur = next(it)
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kcur = keyf(cur)
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except StopIteration:
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return
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kold = kcur
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yield (kcur, ggen(kcur))
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# islice('abcdefghij', 2, None, 3)) --> c f i
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# islice(range(10), 2, 6, 2)) --> 2 4
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def islice(iterable, *sargs):
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if len(sargs) < 1 or len(sargs) > 3:
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raise TypeError('islice expected at least 2, at most 4 arguments, got {:d}'.format(len(sargs)+1))
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raise TypeError(
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"islice expected at least 2, at most 4 arguments, got {:d}".format(len(sargs) + 1)
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)
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step = 1 if len(sargs) < 3 else sargs[2]
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step = 1 if step is None else step
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if step <= 0:
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raise ValueError('step for islice() must be a positive integer or None')
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raise ValueError("step for islice() must be a positive integer or None")
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start = 0 if len(sargs) < 2 else sargs[0]
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stop = sargs[0] if len(sargs) == 1 else sargs[1]
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it = iter(iterable)
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@ -173,10 +194,11 @@ def islice(iterable, *sargs):
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except StopIteration:
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return
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# pairwise(range(5)) --> (0,1) (1,2) (2,3) (3,4)
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# pairwise('abcdefg') --> ('a','b') ('b','c') ('c','d') ('d','e') ('e','f') ('f','g')
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def pairwise(iterable):
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it = iter(iterable)
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it = iter(iterable)
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try:
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l = next(it)
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while True:
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@ -184,7 +206,8 @@ def pairwise(iterable):
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yield l, c
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l = c
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except StopIteration:
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return
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return
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# permutations('ABCD', 2) --> AB AC AD BA BC BD CA CB CD DA DB DC
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# permutations(range(3)) --> 012 021 102 120 201 210
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@ -211,6 +234,7 @@ def permutations(iterable, r=None):
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else:
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return
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# product('ABCD', 'xy') --> ('A','x') ('A','y') ('B','x') ('B','y') ('C','x') ('C','y') ('D','x') ('D','y')
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# product(range(2), repeat=3) --> 000 001 010 011 100 101 110 111 # but in tuples, of course
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def product(*args, repeat=1):
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@ -221,6 +245,7 @@ def product(*args, repeat=1):
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for prod in result:
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yield tuple(prod)
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# repeat(10, 3) --> 10 10 10
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def repeat(obj, times=None):
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if times is None:
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@ -230,11 +255,13 @@ def repeat(obj, times=None):
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for _ in range(times):
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yield obj
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# starmap(pow, [(2,5), (3,2), (10,3)]) --> 32 9 1000
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def starmap(function, iterable):
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for args in iterable:
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yield function(*args)
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# takewhile(lambda x: x<5, [1,4,6,4,1]) --> 1 4
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def takewhile(predicate, iterable):
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for x in iterable:
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@ -243,27 +270,33 @@ def takewhile(predicate, iterable):
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else:
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break
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# tee(range(2,10), 3) --> (it1, it2, it3) all parallel generators, but dependent on original generator (e.g. range(2,10))
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# --> (min(it1), max(it2), sum(it3)) --> (2, 9, 44)
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def tee(iterable, n=2):
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if iter(iterable) is not iter(iterable): # save buffer for special cases that iterable is range, tuple, list ...
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if iter(iterable) is not iter(
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iterable
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): # save buffer for special cases that iterable is range, tuple, list ...
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return [iter(iterable) for _ in range(n)] # that have independent iterators
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it = iter(iterable)
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if n < 1:
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return ()
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elif n == 1:
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return (it,)
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buf = [] # Buffer, contains stored values from itr
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ibuf = [0]*n # Indices of the individual generators, could be array('H', [0]*n)
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def gen(k): # but we have no 0 in ibuf in MP
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nonlocal buf, ibuf # These are bound to the generators as closures
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buf = [] # Buffer, contains stored values from itr
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ibuf = [0] * n # Indices of the individual generators, could be array('H', [0]*n)
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def gen(k): # but we have no 0 in ibuf in MP
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nonlocal buf, ibuf # These are bound to the generators as closures
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while True:
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if ibuf[k] < len(buf): # We get an object stored in the buffer.
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if ibuf[k] < len(buf): # We get an object stored in the buffer.
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r = buf[ibuf[k]]
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ibuf[k] += 1
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if ibuf[k] == 1: # If we got the first object in the buffer,
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if 0 not in ibuf: # then check if other generators do not wait anymore on it
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buf.pop(0) # so it may be popped left. Afterwards decrease all indices by 1.
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if ibuf[k] == 1: # If we got the first object in the buffer,
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if 0 not in ibuf: # then check if other generators do not wait anymore on it
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buf.pop(
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0
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) # so it may be popped left. Afterwards decrease all indices by 1.
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for i in range(n):
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ibuf[i] -= 1
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elif ibuf[k] == len(buf):
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@ -273,8 +306,10 @@ def tee(iterable, n=2):
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ibuf[k] += 1
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except StopIteration:
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return
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yield r # The returned generators are not thread-safe. For that the access to the
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return tuple(gen(i) for i in range(n)) # shared buf and ibuf should be protected by locks.
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yield r # The returned generators are not thread-safe. For that the access to the
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return tuple(gen(i) for i in range(n)) # shared buf and ibuf should be protected by locks.
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# zip_longest('ABCD', 'xy', fillvalue='-') --> ('A','x') ('B','y') ('C','-') ('D','-')
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def zip_longest(*args, fillvalue=None):
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@ -299,12 +334,12 @@ def zip_longest(*args, fillvalue=None):
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# # Full analog of CPython builtin iter with 2 arguments
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# def iter(*args):
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#
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#
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# if len(args) == 1:
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# return builtins.iter(args[0])
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#
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#
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# class _iter:
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#
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#
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# def __init__(self, args):
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# self.f, self.sentinel = args
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# def __next__(self):
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@ -312,6 +347,5 @@ def zip_longest(*args, fillvalue=None):
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# if v == self.sentinel:
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# raise StopIteration
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# return v
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#
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#
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# return _iter(args)
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@ -6,36 +6,66 @@ assert list(itertools.accumulate([0])) == [0]
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assert list(itertools.accumulate([0, 2, 3])) == [0, 2, 5]
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assert list(itertools.accumulate(reversed([0, 2, 3]))) == [3, 5, 5]
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assert list(itertools.accumulate([1, 2, 3], lambda x, y: x * y)) == [1, 2, 6]
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assert list(itertools.accumulate([1,2,3,4,5], func=lambda x, y: x - y, initial=10)) == [10, 9, 7, 4, 0, -5]
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assert list(itertools.accumulate([1, 2, 3, 4, 5], func=lambda x, y: x - y, initial=10)) == [
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10,
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9,
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7,
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4,
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0,
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-5,
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]
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# chain
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assert list(itertools.chain()) == []
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assert list(itertools.chain([],[],[])) == []
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assert list(itertools.chain(range(3),[2*(i+1) for i in range(4)])) == [0, 1, 2, 2, 4, 6, 8]
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assert list(itertools.chain('abcd',[],range(5))) == ['a', 'b', 'c', 'd', 0, 1, 2, 3, 4]
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assert list(itertools.chain([], [], [])) == []
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assert list(itertools.chain(range(3), [2 * (i + 1) for i in range(4)])) == [0, 1, 2, 2, 4, 6, 8]
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assert list(itertools.chain("abcd", [], range(5))) == ["a", "b", "c", "d", 0, 1, 2, 3, 4]
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assert list(itertools.chain.from_iterable([])) == []
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assert list(itertools.chain.from_iterable(['ABC', 'DEF'])) == ['A', 'B', 'C', 'D', 'E', 'F']
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assert list(itertools.chain.from_iterable(["ABC", "DEF"])) == ["A", "B", "C", "D", "E", "F"]
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# combinations
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assert list(itertools.combinations('', 1)) == []
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assert list(itertools.combinations('ABCD', 0)) == [()]
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assert list(itertools.combinations('ABCD', 1)) == [('A',), ('B',), ('C',), ('D',)]
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assert list(itertools.combinations('ABCD', 3)) == [('A', 'B', 'C'), ('A', 'B', 'D'), ('A', 'C', 'D'), ('B', 'C', 'D')]
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assert list(itertools.combinations('ABCD', 4)) == [('A', 'B', 'C', 'D')]
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assert list(itertools.combinations('ABCD', 5)) == []
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assert list(itertools.combinations("", 1)) == []
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assert list(itertools.combinations("ABCD", 0)) == [()]
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assert list(itertools.combinations("ABCD", 1)) == [("A",), ("B",), ("C",), ("D",)]
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assert list(itertools.combinations("ABCD", 3)) == [
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("A", "B", "C"),
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("A", "B", "D"),
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("A", "C", "D"),
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("B", "C", "D"),
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]
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assert list(itertools.combinations("ABCD", 4)) == [("A", "B", "C", "D")]
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assert list(itertools.combinations("ABCD", 5)) == []
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assert len(list(itertools.combinations(range(7), 4))) == 35
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assert len(set(itertools.combinations(range(7), 4))) == 35
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# combinations with replacement
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assert list(itertools.combinations_with_replacement('ABCD', 0)) == [()]
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assert list(itertools.combinations_with_replacement('ABCD', 1)) == [('A',), ('B',), ('C',), ('D',)]
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assert list(itertools.combinations_with_replacement('ABC', 2)) == [('A', 'A'), ('A', 'B'), ('A', 'C'), ('B', 'B'), ('B', 'C'), ('C', 'C')]
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assert list(itertools.combinations_with_replacement('ABC', 3)) == [('A', 'A', 'A'), ('A', 'A', 'B'), ('A', 'A', 'C'), ('A', 'B', 'B'), ('A', 'B', 'C'), ('A', 'C', 'C'), ('B', 'B', 'B'), ('B', 'B', 'C'), ('B', 'C', 'C'), ('C', 'C', 'C')]
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assert list(itertools.combinations_with_replacement("ABCD", 0)) == [()]
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assert list(itertools.combinations_with_replacement("ABCD", 1)) == [("A",), ("B",), ("C",), ("D",)]
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assert list(itertools.combinations_with_replacement("ABC", 2)) == [
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("A", "A"),
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("A", "B"),
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("A", "C"),
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("B", "B"),
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("B", "C"),
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("C", "C"),
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]
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assert list(itertools.combinations_with_replacement("ABC", 3)) == [
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("A", "A", "A"),
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("A", "A", "B"),
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("A", "A", "C"),
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("A", "B", "B"),
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("A", "B", "C"),
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("A", "C", "C"),
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("B", "B", "B"),
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("B", "B", "C"),
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("B", "C", "C"),
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("C", "C", "C"),
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]
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# compress
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assert tuple(itertools.compress('ABCDEF', (1,0,1,0,1,1))) == ('A', 'C', 'E', 'F')
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assert tuple(itertools.compress('ABCDEF', (1,0,1,1,0))) == ('A', 'C', 'D')
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assert tuple(itertools.compress("ABCDEF", (1, 0, 1, 0, 1, 1))) == ("A", "C", "E", "F")
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assert tuple(itertools.compress("ABCDEF", (1, 0, 1, 1, 0))) == ("A", "C", "D")
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# count
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it = itertools.count(4, 3)
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@ -44,53 +74,120 @@ for _ in range(200):
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assert list(next(it) for _ in range(5)) == [604, 607, 610, 613, 616]
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# cycle
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it = itertools.cycle(iter('abcde'))
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assert list(next(it) for _ in range(12)) == ['a', 'b', 'c', 'd', 'e', 'a', 'b', 'c', 'd', 'e', 'a', 'b']
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it = itertools.cycle([2, 4, 'x'])
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assert list(next(it) for _ in range(7)) == [2, 4, 'x', 2, 4, 'x', 2]
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it = itertools.cycle(iter("abcde"))
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assert list(next(it) for _ in range(12)) == [
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"a",
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"b",
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"c",
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"d",
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"e",
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"a",
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"b",
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"c",
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"d",
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"e",
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"a",
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"b",
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]
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it = itertools.cycle([2, 4, "x"])
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assert list(next(it) for _ in range(7)) == [2, 4, "x", 2, 4, "x", 2]
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# dropwhile
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assert list(itertools.dropwhile(lambda x: x<5, [1,4,6,4,1])) == [6, 4, 1]
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assert list(itertools.dropwhile(lambda x: ord(x)<118, '')) == []
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assert list(itertools.dropwhile(lambda x: ord(x)<118, 'dropwhile')) == ['w', 'h', 'i', 'l', 'e']
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assert list(itertools.dropwhile(lambda x: x < 5, [1, 4, 6, 4, 1])) == [6, 4, 1]
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assert list(itertools.dropwhile(lambda x: ord(x) < 118, "")) == []
|
||||
assert list(itertools.dropwhile(lambda x: ord(x) < 118, "dropwhile")) == ["w", "h", "i", "l", "e"]
|
||||
|
||||
# filterfalse
|
||||
assert list(itertools.filterfalse(lambda x: ord(x)<110, 'dropwhile')) == ['r', 'o', 'p', 'w']
|
||||
assert list(itertools.filterfalse(lambda x: ord(x) < 110, "dropwhile")) == ["r", "o", "p", "w"]
|
||||
|
||||
# groupby
|
||||
assert list(((k,''.join(g)) for k,g in itertools.groupby('aaaabbbccdaa'))) == [('a', 'aaaa'), ('b', 'bbb'), ('c', 'cc'), ('d', 'd'), ('a', 'aa')]
|
||||
assert list(((k, "".join(g)) for k, g in itertools.groupby("aaaabbbccdaa"))) == [
|
||||
("a", "aaaa"),
|
||||
("b", "bbb"),
|
||||
("c", "cc"),
|
||||
("d", "d"),
|
||||
("a", "aa"),
|
||||
]
|
||||
|
||||
# islice
|
||||
assert ''.join(itertools.islice('', 2, 5)) == ''
|
||||
assert ''.join(itertools.islice('abcdefgh', 2, 5)) == 'cde'
|
||||
assert ''.join(itertools.islice('abcdefghij', 2, None, 3)) == 'cfi'
|
||||
assert ''.join(itertools.islice('abcdefghij', 2, None)) == 'cdefghij'
|
||||
assert ''.join(itertools.islice('abcdefghij', 6)) == 'abcdef'
|
||||
assert ''.join(itertools.islice('abcdefghij', 6, 6)) == ''
|
||||
assert "".join(itertools.islice("", 2, 5)) == ""
|
||||
assert "".join(itertools.islice("abcdefgh", 2, 5)) == "cde"
|
||||
assert "".join(itertools.islice("abcdefghij", 2, None, 3)) == "cfi"
|
||||
assert "".join(itertools.islice("abcdefghij", 2, None)) == "cdefghij"
|
||||
assert "".join(itertools.islice("abcdefghij", 6)) == "abcdef"
|
||||
assert "".join(itertools.islice("abcdefghij", 6, 6)) == ""
|
||||
assert list(itertools.islice(range(10), 2, 6, 2)) == [2, 4]
|
||||
assert list(itertools.islice(itertools.cycle([1, 2, 3]), 10)) == [1, 2, 3, 1, 2, 3, 1, 2, 3, 1]
|
||||
|
||||
# pairwise
|
||||
assert list(itertools.pairwise(range(5))) == [(0, 1), (1, 2), (2, 3), (3, 4)]
|
||||
assert list((''.join(t) for t in itertools.pairwise('abcdefg'))) == ['ab', 'bc', 'cd', 'de', 'ef', 'fg']
|
||||
assert list((''.join(t) for t in itertools.pairwise('ab'))) == ['ab']
|
||||
assert list((''.join(t) for t in itertools.pairwise('a'))) == []
|
||||
assert list((''.join(t) for t in itertools.pairwise(''))) == []
|
||||
assert list(("".join(t) for t in itertools.pairwise("abcdefg"))) == [
|
||||
"ab",
|
||||
"bc",
|
||||
"cd",
|
||||
"de",
|
||||
"ef",
|
||||
"fg",
|
||||
]
|
||||
assert list(("".join(t) for t in itertools.pairwise("ab"))) == ["ab"]
|
||||
assert list(("".join(t) for t in itertools.pairwise("a"))) == []
|
||||
assert list(("".join(t) for t in itertools.pairwise(""))) == []
|
||||
|
||||
# permutations
|
||||
assert list(itertools.permutations('', 1)) == []
|
||||
assert list((''.join(t) for t in itertools.permutations('a', 2))) == []
|
||||
assert list((''.join(t) for t in itertools.permutations('abcd', 0))) == ['']
|
||||
assert list((''.join(t) for t in itertools.permutations('ab', 2))) == ['ab', 'ba']
|
||||
assert list((''.join(t) for t in itertools.permutations('abcd', 2))) == ['ab', 'ac', 'ad', 'ba', 'bc', 'bd', 'ca', 'cb', 'cd', 'da', 'db', 'dc']
|
||||
assert list(itertools.permutations(range(3))) == [(0, 1, 2), (0, 2, 1), (1, 0, 2), (1, 2, 0), (2, 0, 1), (2, 1, 0)]
|
||||
assert list(itertools.permutations("", 1)) == []
|
||||
assert list(("".join(t) for t in itertools.permutations("a", 2))) == []
|
||||
assert list(("".join(t) for t in itertools.permutations("abcd", 0))) == [""]
|
||||
assert list(("".join(t) for t in itertools.permutations("ab", 2))) == ["ab", "ba"]
|
||||
assert list(("".join(t) for t in itertools.permutations("abcd", 2))) == [
|
||||
"ab",
|
||||
"ac",
|
||||
"ad",
|
||||
"ba",
|
||||
"bc",
|
||||
"bd",
|
||||
"ca",
|
||||
"cb",
|
||||
"cd",
|
||||
"da",
|
||||
"db",
|
||||
"dc",
|
||||
]
|
||||
assert list(itertools.permutations(range(3))) == [
|
||||
(0, 1, 2),
|
||||
(0, 2, 1),
|
||||
(1, 0, 2),
|
||||
(1, 2, 0),
|
||||
(2, 0, 1),
|
||||
(2, 1, 0),
|
||||
]
|
||||
|
||||
# product
|
||||
assert list(itertools.product()) == [()]
|
||||
assert list(itertools.product(range(2), repeat=0)) == [()]
|
||||
assert list((''.join(t) for t in itertools.product('ABC', 'xy'))) == ['Ax', 'Ay', 'Bx', 'By', 'Cx', 'Cy']
|
||||
assert list((''.join(t) for t in itertools.product('A', 'xy', repeat=2))) == ['AxAx', 'AxAy', 'AyAx', 'AyAy']
|
||||
assert list((''.join(map(str,t)) for t in itertools.product(range(2), repeat=3))) == ['000','001','010','011','100','101','110','111']
|
||||
assert list(("".join(t) for t in itertools.product("ABC", "xy"))) == [
|
||||
"Ax",
|
||||
"Ay",
|
||||
"Bx",
|
||||
"By",
|
||||
"Cx",
|
||||
"Cy",
|
||||
]
|
||||
assert list(("".join(t) for t in itertools.product("A", "xy", repeat=2))) == [
|
||||
"AxAx",
|
||||
"AxAy",
|
||||
"AyAx",
|
||||
"AyAy",
|
||||
]
|
||||
assert list(("".join(map(str, t)) for t in itertools.product(range(2), repeat=3))) == [
|
||||
"000",
|
||||
"001",
|
||||
"010",
|
||||
"011",
|
||||
"100",
|
||||
"101",
|
||||
"110",
|
||||
"111",
|
||||
]
|
||||
|
||||
# repeat
|
||||
assert list(itertools.repeat(10, 0)) == []
|
||||
|
|
@ -99,29 +196,42 @@ assert list(itertools.repeat(10, 3)) == [10, 10, 10]
|
|||
|
||||
# starmap
|
||||
assert list(itertools.starmap(pow, [])) == []
|
||||
assert list(itertools.starmap(pow, [(2,5), (3,2), (10,3)])) == [32, 9, 1000]
|
||||
assert list(itertools.starmap(pow, [(2, 5), (3, 2), (10, 3)])) == [32, 9, 1000]
|
||||
assert list(itertools.starmap(lambda x, y: x * y, [[1, 2], [2, 3], [3, 4]])) == [2, 6, 12]
|
||||
|
||||
# takewhile
|
||||
assert list(itertools.takewhile(lambda x: x<5, [1,4,6,4,1])) == [1, 4]
|
||||
assert list(itertools.takewhile(lambda x: ord(x)<118, 'dropwhile')) == ['d', 'r', 'o', 'p']
|
||||
assert list(itertools.takewhile(lambda x: x < 5, [1, 4, 6, 4, 1])) == [1, 4]
|
||||
assert list(itertools.takewhile(lambda x: ord(x) < 118, "dropwhile")) == ["d", "r", "o", "p"]
|
||||
|
||||
# tee
|
||||
def genx(n):
|
||||
i=1;
|
||||
i = 1
|
||||
while True:
|
||||
yield i; i+=1
|
||||
if i >n:
|
||||
yield i
|
||||
i += 1
|
||||
if i > n:
|
||||
return
|
||||
it1, it2, it3 = itertools.tee(genx(1000), 3); _ = next(it1) # case of iterable that is unique; iterate once
|
||||
assert [min(it1), max(it2), sum(it3)] == [2, 1000, 500500]
|
||||
it1, it2, it3 = itertools.tee(range(2,10), 3); _ = next(it1) # iterable that is not unique; iterate once
|
||||
assert [min(it1), max(it2), sum(it3)] == [3, 9, 44] # the min is increased, other iterators remained full
|
||||
|
||||
|
||||
it1, it2, it3 = itertools.tee(genx(1000), 3)
|
||||
_ = next(it1) # case of iterable that is unique; iterate once
|
||||
assert [min(it1), max(it2), sum(it3)] == [2, 1000, 500500]
|
||||
it1, it2, it3 = itertools.tee(range(2, 10), 3)
|
||||
_ = next(it1) # iterable that is not unique; iterate once
|
||||
assert [min(it1), max(it2), sum(it3)] == [
|
||||
3,
|
||||
9,
|
||||
44,
|
||||
] # the min is increased, other iterators remained full
|
||||
|
||||
# zip_longest
|
||||
assert list(itertools.zip_longest('', '')) == []
|
||||
assert list(itertools.zip_longest('', '', fillvalue='-')) == []
|
||||
assert list(itertools.zip_longest('', 'xy')) == [(None, 'x'), (None, 'y')]
|
||||
assert list(itertools.zip_longest('', 'xy', fillvalue='-')) == [('-', 'x'), ('-', 'y')]
|
||||
assert list(itertools.zip_longest('ABCD', 'xy', fillvalue='-')) == [('A','x'),('B','y'),('C','-'),('D','-')]
|
||||
|
||||
assert list(itertools.zip_longest("", "")) == []
|
||||
assert list(itertools.zip_longest("", "", fillvalue="-")) == []
|
||||
assert list(itertools.zip_longest("", "xy")) == [(None, "x"), (None, "y")]
|
||||
assert list(itertools.zip_longest("", "xy", fillvalue="-")) == [("-", "x"), ("-", "y")]
|
||||
assert list(itertools.zip_longest("ABCD", "xy", fillvalue="-")) == [
|
||||
("A", "x"),
|
||||
("B", "y"),
|
||||
("C", "-"),
|
||||
("D", "-"),
|
||||
]
|
||||
|
|
|
|||
Ładowanie…
Reference in New Issue