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33 lines
981 B
Python
33 lines
981 B
Python
"""Utilities for formatting strings."""
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from string import Formatter
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from typing import Any, Mapping, Sequence, Union
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class StrictFormatter(Formatter):
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"""A subclass of formatter that checks for extra keys."""
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def check_unused_args(
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self,
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used_args: Sequence[Union[int, str]],
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args: Sequence,
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kwargs: Mapping[str, Any],
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) -> None:
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"""Check to see if extra parameters are passed."""
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extra = set(kwargs).difference(used_args)
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if extra:
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raise KeyError(extra)
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def vformat(
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self, format_string: str, args: Sequence, kwargs: Mapping[str, Any]
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) -> str:
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"""Check that no arguments are provided."""
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if len(args) > 0:
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raise ValueError(
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"No arguments should be provided, "
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"everything should be passed as keyword arguments."
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)
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return super().vformat(format_string, args, kwargs)
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formatter = StrictFormatter()
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