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import hashlib
class SHA1MatchException(Exception):
...
def sha1_check(path, data, expected):
"""
Check if the SHA1 checksum of the 'data' is equal to the 'expected' checksum.
If the checksum does not match, an exception is raised.
"""
sha1 = hashlib.sha1()
sha1.update(data)
current = sha1.hexdigest().upper()
if current != expected:
raise SHA1MatchException(f"SHA1 checksum is not matching for '{path}'.\n'{current}'\n'{expected}'")
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