docker-tidy/dockertidy/utils.py

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#!/usr/bin/env python3
"""Global utility methods and classes."""
from distutils.util import strtobool
def to_bool(string):
return bool(strtobool(str(string)))
def dict_intersect(d1, d2):
return {
k: dict_intersect(d1[k], d2[k]) if isinstance(d1[k], dict) else d1[k]
for k in d1.keys() & d2.keys()
}
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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): # noqa
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if cls not in cls._instances:
cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
return cls._instances[cls]