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50 lines
1.0 KiB
Python
50 lines
1.0 KiB
Python
#!/usr/bin/env python3
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"""Global utility methods and classes."""
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def strtobool(value):
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"""Convert a string representation of truth to true or false."""
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_map = {
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"y": True,
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"yes": True,
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"t": True,
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"true": True,
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"on": True,
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"1": True,
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"n": False,
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"no": False,
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"f": False,
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"false": False,
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"off": False,
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"0": False
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}
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try:
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return _map[str(value).lower()]
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except KeyError as err:
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raise ValueError(f'"{value}" is not a valid bool value') from err
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def to_bool(string):
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return bool(strtobool(str(string)))
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def dict_intersect(d1, d2):
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return {
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k: dict_intersect(d1[k], d2[k]) if isinstance(d1[k], dict) else d1[k]
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for k in d1.keys() & d2.keys()
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}
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class Singleton(type):
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"""Singleton metaclass."""
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_instances = {}
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def __call__(cls, *args, **kwargs):
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if cls not in cls._instances:
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cls._instances[cls] = super().__call__(*args, **kwargs)
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return cls._instances[cls]
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