paul j3 added the comment:
These three changes end up testing for the same thing. The initial 'if' catches
different test cases. 'subparsers' or 'remainder' might 'confuse' the 'O'
test. The zero-width test ends up weeding out everything but the test cases
added for this issue.
# if we haven't hit the end of the command line strings,
if start_index + sum(arg_counts) != len(arg_strings_pattern):
while arg_counts and arg_counts[-1] == 0:
arg_counts.pop()
# same test using selected_pattern (= arg_strings_pattern[start_index:])
if len(selected_pattern) != sum(arg_counts):
while arg_counts and arg_counts[-1] == 0:
arg_counts.pop()
# alt test: test for optional in the remaining pattern
if 'O' in selected_pattern:
while arg_counts and arg_counts[-1] == 0:
arg_counts.pop()
----------
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<http://bugs.python.org/issue15112>
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