How to use 'how to make python not case sensitive' in Python

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def prep_case_insensitive(value):
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    """Prepare a string for case-insensitive comparison.
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    This is defined in RFC4518. For simplicity, all this function does is
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    lowercase all the characters, strip leading and trailing whitespace,
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    and compress sequences of spaces to a single space.
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    """
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    value = re.sub(r'\s+', ' ', value.strip().lower())
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    return value

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def test_case_insensitive_true(self):
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    """Verify that case insensitive variants of 'true' returns the True
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    boolean.
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    """
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    values = ['true', 'TRUE', 'True', 'tRuE', 't', 'T', ]
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    for value in values:
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        received = str_to_bool(value)
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        self.assertTrue(received)