Tests: tidy up printbuf().

uasyncio_iostream/tests/iotest1.py

@@ -11,8 +11,7 @@ MP_STREAM_POLL = const(3)
 MP_STREAM_ERROR = const(-1)
 
 def printbuf(this_io):
-    for ch in this_io.wbuf[:this_io.wprint_len]:
-        print(chr(ch), end='')
+    print(bytes(this_io.wbuf[:this_io.wprint_len]).decode(), end='')
 
 class MyIO(io.IOBase):
     def __init__(self):

uasyncio_iostream/tests/iotest2.py

@@ -12,8 +12,7 @@ MP_STREAM_POLL = const(3)
 MP_STREAM_ERROR = const(-1)
 
 def printbuf(this_io):
-    for ch in this_io.wbuf[:this_io.wprint_len]:
-        print(chr(ch), end='')
+    print(bytes(this_io.wbuf[:this_io.wprint_len]).decode(), end='')
     this_io.wbuf = b''
 
 class MyIO(io.IOBase):

uasyncio_iostream/tests/iotest3.py

@@ -51,8 +51,7 @@ class MyIOR(io.IOBase):
 # a ready status. For the demo it stores the characters in .wbuf for printing.
 
 def printbuf(this_io):
-    for x in range(this_io.wprint_len):
-        print(chr(this_io.wbuf[x]), end = '')
+    print(bytes(this_io.wbuf[:this_io.wprint_len]).decode(), end='')
 
 class MyIOW(io.IOBase):
     def __init__(self):

uasyncio_iostream/tests/iotest4.py

@@ -20,8 +20,7 @@ MP_STREAM_POLL = const(3)
 MP_STREAM_ERROR = const(-1)
 
 def printbuf(this_io):
-    for ch in this_io.wbuf[:this_io.wprint_len]:
-        print(chr(ch), end='')
+    print(bytes(this_io.wbuf[:this_io.wprint_len]).decode(), end='')
 
 class MyIO(io.IOBase):
     def __init__(self, read=False, write=False):

uasyncio_iostream/tests/iotest5.py

@@ -20,8 +20,7 @@ MP_STREAM_POLL = const(3)
 MP_STREAM_ERROR = const(-1)
 
 def printbuf(this_io):
-    for ch in this_io.wbuf[:this_io.wprint_len]:
-        print(chr(ch), end='')
+    print(bytes(this_io.wbuf[:this_io.wprint_len]).decode(), end='')
 
 class MyIO(io.IOBase):
     def __init__(self, read=False, write=False):