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gh-71494: string.Formatter: support keys/attributes in unnumbered fields (GH-21767)

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qm2k 2025-01-31 12:16:24 +00:00 • committed by GitHub
parent 0373926260
commit 22b2d37f42
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3 changed files with 28 additions and 7 deletions
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15
Lib/string.py
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@ -212,19 +212,20 @@ def _vformat(self, format_string, args, kwargs, used_args, recursion_depth,
# this is some markup, find the object and do
# the formatting
# handle arg indexing when empty field_names are given.
if field_name == '':
# handle arg indexing when empty field first parts are given.
field_first, _ = _string.formatter_field_name_split(field_name)
if field_first == '':
if auto_arg_index is False:
raise ValueError('cannot switch from manual field '
'specification to automatic field '
'numbering')
field_name = str(auto_arg_index)
field_name = str(auto_arg_index) + field_name
auto_arg_index += 1
elif field_name.isdigit():
elif isinstance(field_first, int):
if auto_arg_index:
raise ValueError('cannot switch from manual field '
'specification to automatic field '
'numbering')
raise ValueError('cannot switch from automatic field '
'numbering to manual field '
'specification')
# disable auto arg incrementing, if it gets
# used later on, then an exception will be raised
auto_arg_index = False