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micropython/tests/cpydiff/modules_random_randint.py

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Python
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extmod/modurandom: Add error message when getrandbits has bad value. The random module's getrandbits() method didn't give a proper error message when calling it with a value that was outside of the range of 1-32, which can lead to confusion using this function (which under CPython can accept numbers larger than 32). Now instead of simply giving a ValueError it gives an error message that states that the number of bits is constrained. Also, since the random module's functions getrandbits() and randint() differ from CPython, tests have been added to describe these differences. For getrandbits the relevant documentation is shown and added to the docs. The same is given for randint method so that the information is more easily found. Finally, since the int object lacks the bit_length() method there is a test for that method also to include within the docs, showing the difference to CPython.
2020-12-23 17:05:26 +00:00
"""
categories: Modules,random
description: ``randint`` method can only return an integer that is at most the native word size.
cause: PRNG is only able to generate 32 bits of state at a time. The result is then cast into a native sized int instead of a full int object.
workaround: If you need integers larger than native wordsize use the random module from micropython-lib.
"""
import random
all: Update Python formatting to latest Black version 22.1.0. Signed-off-by: Damien George <damien@micropython.org>
2022-02-02 05:11:25 +00:00
x = random.randint(2**128 - 1, 2**128)
extmod/modurandom: Add error message when getrandbits has bad value. The random module's getrandbits() method didn't give a proper error message when calling it with a value that was outside of the range of 1-32, which can lead to confusion using this function (which under CPython can accept numbers larger than 32). Now instead of simply giving a ValueError it gives an error message that states that the number of bits is constrained. Also, since the random module's functions getrandbits() and randint() differ from CPython, tests have been added to describe these differences. For getrandbits the relevant documentation is shown and added to the docs. The same is given for randint method so that the information is more easily found. Finally, since the int object lacks the bit_length() method there is a test for that method also to include within the docs, showing the difference to CPython.
2020-12-23 17:05:26 +00:00
print("x={}".format(x))