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Issue 24205: Improve inspect.Signature.bind() error messages.

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This commit is contained in:
Yury Selivanov 2015-05-19 00:27:49 -04:00
parent fee05daef8
commit 8687275358
2 changed files with 29 additions and 17 deletions
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16
Lib/inspect.py
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@ -2762,7 +2762,7 @@ class Signature:
parameters_ex = (param,)
break
else:
msg = '{arg!r} parameter lacking default value'
msg = 'missing a required argument: {arg!r}'
msg = msg.format(arg=param.name)
raise TypeError(msg) from None
else:
@ -2775,7 +2775,8 @@ class Signature:
if param.kind in (_VAR_KEYWORD, _KEYWORD_ONLY):
# Looks like we have no parameter for this positional
# argument
raise TypeError('too many positional arguments')
raise TypeError(
'too many positional arguments') from None
if param.kind == _VAR_POSITIONAL:
# We have an '*args'-like argument, let's fill it with
@ -2787,8 +2788,9 @@ class Signature:
break
if param.name in kwargs:
raise TypeError('multiple values for argument '
'{arg!r}'.format(arg=param.name))
raise TypeError(
'multiple values for argument {arg!r}'.format(
arg=param.name)) from None
arguments[param.name] = arg_val
@ -2817,7 +2819,7 @@ class Signature:
# arguments.
if (not partial and param.kind != _VAR_POSITIONAL and
param.default is _empty):
raise TypeError('{arg!r} parameter lacking default value'. \
raise TypeError('missing a required argument: {arg!r}'. \
format(arg=param_name)) from None
else:
@ -2836,7 +2838,9 @@ class Signature:
# Process our '**kwargs'-like parameter
arguments[kwargs_param.name] = kwargs
else:
raise TypeError('too many keyword arguments')
raise TypeError(
'got an unexpected keyword argument {arg!r}'.format(
arg=next(iter(kwargs))))
return self._bound_arguments_cls(self, arguments)