def METHOD_NAME():
    # Terraform expects case-sensitive environment variables, which does not work inside tox
    # on Windows since it passes down variables using the case-insensitive os.environ.
    env = dict(os.environ)
    for key in list(env):
        _, prefix, variable = key.lower().partition('tf_var_')
        if prefix:
            value = env.pop(key)
            env['TF_VAR_{}'.format(variable)] = value
    return env