py-pbr/pbr/options.py

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import os


TRUE_VALUES = ('true', '1', 'yes')


def get_boolean_option(option_dict, option_name, env_name):
    return ((option_name in option_dict
             and option_dict[option_name][1].lower() in TRUE_VALUES) or
            str(os.getenv(env_name)).lower() in TRUE_VALUES)