[issue35787] shlex.split inserts extra item on backslash space space
Eric V. Smith
report at bugs.python.org
Sun Jan 20 10:27:33 EST 2019
Eric V. Smith <eric at trueblade.com> added the comment:
I agree that the current behavior makes sense. I think "preserve the literal value of the next character" means the space won't be interpreted as a separator.
In the first example (I think better written as shlex.split(r'a \ b')), the first space is a separator. The second space is not a separator because of the backslash, so it's part of the second token ' b'.
In the second example (shlex.split(r'a \ b')), the first space is a separator, the second space is not a separator because of the backslash, and the third space is a separator. This explains why there's no space before the 'b'.
I assume peter.otten's example is bash. I can confirm with zsh:
[~]$ python3 -c 'import sys; print(sys.argv)' a b
['-c', 'a', 'b']
[~]$ python3 -c 'import sys; print(sys.argv)' a \ b
['-c', 'a', ' b']
[~]$ python3 -c 'import sys; print(sys.argv)' a \ b
['-c', 'a', ' ', 'b']
I'm going to close this. But anyone wants to suggest a documentation patch, feel free to reopen this.
Also, changing this would no doubt break some code, so I'd recommend against changing it even if I didn't think it was doing the right thing.
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nosy: +eric.smith
resolution: -> not a bug
stage: -> resolved
status: open -> closed
type: -> behavior
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