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The TypeError message when a call to subprocess.Popen() lacks the args argument is incorrect.
For 3.3 and 3.4, the message incorrectly says that a positional argument is required when a keyword argument will do:
>>> import subprocess
>>> subprocess.Popen()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: __init__() missing 1 required positional argument: 'args'
>>> subprocess.Popen(args=['test'])
<subprocess.Popen object at 0x10bed4840>
For 3.2 and 2.7, the problem is slightly different. It says that two arguments are needed and that two have been given:
>>> subprocess.Popen()
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: __init__() takes at least 2 arguments (1 given)
>>> subprocess.Popen(shell=True)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: __init__() takes at least 2 arguments (2 given)
I don't know if this issue affects other functions in the standard library, but I suspect it might.