27 lines
680 B
Python
27 lines
680 B
Python
"""
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Module implementing message related functions and classes.
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"""
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from typing import Type, TypeVar
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QuestionInst = TypeVar('QuestionInst', bound='Question')
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class MessageError(Exception):
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pass
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class Question(str):
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"""
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A single question with a defined prefix.
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"""
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prefix = '=== QUESTION ==='
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def __new__(cls: Type[QuestionInst], string: str) -> QuestionInst:
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"""
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Make sure the tag string does not contain the default separator.
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"""
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if cls.prefix in string:
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raise MessageError(f"Question '{string}' contains the prefix '{cls.prefix}'")
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instance = super().__new__(cls, string)
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return instance
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