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It seems shlex fails on processing strings ending in space, causing this bug that I reported for IPython:
https://github.com/ipython/ipython/issues/1109
Fernando Perez made a minimal example of the problem, quoted below. As he points out, it would be best to fix this at the source, namely the shlex module.
Python 2.7.2 |EPD 7.1-1 (32-bit)| (default, Jul 3 2011, 15:13:59) [MSC v.1500 32 bit (Intel)] on win32
>>> import shlex
>>> lex = shlex.shlex(' ("a ")', posix=False)
>>> lex.whitespace_split = True
>>> list(lex)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "C:\Python27\lib\shlex.py", line 269, in next
 token = self.get_token()
 File "C:\Python27\lib\shlex.py", line 96, in get_token
 raw = self.read_token()
 File "C:\Python27\lib\shlex.py", line 172, in read_token
 raise ValueError, "No closing quotation"
ValueError: No closing quotation