Terry J. Reedy added the comment:
If you are the same 'ariel' as on SO, thank you for the detective work and the
informative report here. Without it this 2.7-only bug would be low priority and
might have sat open until we stopped patching 2.7.
The underlying issue is that a) 2.x had the 'feature' of allowing tuples of
parameter names to signal automatic unpacking of tuples of arguments, and b)
the unnamed tuple got a pseudoname of the form '.n' in the list of argument
names, which calltips uses.
>>> def f((a,b), (c,d)): pass
>>> f.func_code.co_varnames
('.0', '.1', 'a', 'b', 'c', 'd')
Issue #791968 added the following line to change '.n' to '<tuple>'.
arg_text = "(%s)" % re.sub("\.\d+", "<tuple>", arg_text)
But this also changes float strings of form 'm.n' to 'm<tuple>'. The solution
is to recognize the difference between the absence and presence of a preceding
digit and not do the substitution in the latter case. Adding the negative
lookbehind assertion (?<![0-9]) makes
def f((a,b), c=0.0):
produce (<tuple>, c=0.0). I am preparing a patch, including the test.
----------
assignee: -> terry.reedy
nosy: +terry.reedy
stage: -> test needed
title: Arguments tooltip wrong if def contains fractional default value -> Idle
2.7: Calltip wrong if def contains float default value
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Python tracker <[email protected]>
<http://bugs.python.org/issue18539>
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