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Update "Format String Syntax" documentation block to match actual behaviour#132736
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python-cla-botbot commentedApr 19, 2025 • edited
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StanFromIreland commentedApr 19, 2025 • edited
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See:#127833 We could update the whole snippet now. I'd ask Petr for what his plan was but he's unavailable at the moment. |
Doc/library/string.rst Outdated
| arg_name: [`~python-grammar:identifier` | `~python-grammar:digit`+] | ||
| attribute_name:`~python-grammar:identifier` | ||
| arg_name: [`~python-grammar:digit`+ | `attribute_name`] | ||
| attribute_name:<any source character except "]" or "."> + |
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Any?
Are you sure that can use bothN andℕ as attribute names?
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Yes, any. 👌
It works the same way as kwargs in functions.
In [1]: def f(**kwargs): ...: print(kwargs) ...: In [2]: d = {"-": 1, "N": 2, "ℕ": 3, "փ": 4, " ": 5}In [3]: f(**d){'-': 1, 'N': 2, 'ℕ': 3, 'փ': 4, ' ': 5}In [4]: "{-} {N} {ℕ} {փ} { }".format(**d)Out[4]: '1 2 3 4 5'
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You can even use]:
>>classC:...def__init__(self,path=()):self.path=path...def__getitem__(self,key):returnC((*self.path,key))...def__getattr__(self,name):returnC((*self.path,name))...def__str__(self):returnstr(self.path)...>>>'{].][{].\0!s}'.format_map(C())"(']', ']', '{', '\\x00')">>>'{.][{].\0!s}'.format(C())"(']', '{', '\\x00')"
| attribute_name: <any source character except "]" or "."> + | |
| attribute_name: <any source character except "{", "}", "[", or "."> + |
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You are right, thank you! 👍
Updated the PR. 👌
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Hello, let me try to help a bit with docs.
Here is an string formatting example:
This behaviour differs fromFormat String Syntax:
So I updated
arg_nameandattribute_namesyntax in that section to follow the actual behaviour:identifierwithattribute_nameinarg_nameattribute_nameasanything that doesn’t contain "." or "]"You can find original discussion threadhere
📚 Documentation preview 📚:https://cpython-previews--132736.org.readthedocs.build/en/132736/library/string.html#format-string-syntax