[New-bugs-announce] [issue28257] Regression for star argument parameter error messages

[Kay Hayen]

New submission from Kay Hayen:

Hello,

there is a regression in the beta (alpha 4 was ok) for this kind of code:

print("Complex call with both invalid star list and star arguments:")

try:
    a = 1
    b = 2.0

    functionWithDefaults(1,c = 3,*a,**b)
except TypeError as e:
    print(repr(e))

try:
    a = 1
    b = 2.0

    functionWithDefaults(1,*a,**b)
except TypeError as e:
    print(repr(e))

try:
    a = 1
    b = 2.0

    functionWithDefaults(c = 1, *a,**b)
except TypeError as e:
    print(repr(e))

try:
    a = 1
    b = 2.0

    functionWithDefaults(*a,**b)
except TypeError as e:
    print(repr(e))

This prints with beta1 3.6

Complex call with both invalid star list and star arguments:
TypeError("'int' object is not iterable",)
TypeError("'int' object is not iterable",)
TypeError("'float' object is not iterable",)
TypeError('functionWithDefaults() argument after ** must be a mapping, not float',)

The later message is what they all probably should be like. This is 3.5 output:

Complex call with both invalid star list and star arguments:
TypeError('functionWithDefaults() argument after ** must be a mapping, not float',)
TypeError('functionWithDefaults() argument after ** must be a mapping, not float',)
TypeError('functionWithDefaults() argument after ** must be a mapping, not float',)
TypeError('functionWithDefaults() argument after ** must be a mapping, not float',)

The function itself doesn't matter obviously, it's never called. Please restore the old behavior, thanks.

Yours,
Kay

----------
messages: 277270
nosy: kayhayen
priority: normal
severity: normal
status: open
title: Regression for star argument parameter error messages
type: behavior
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28257>
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