21 lines
466 B
Python
21 lines
466 B
Python
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import re
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def upc_to_gtin_13(upc: str):
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"""
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Convert UPC-A to GTIN-13, return None if validation failed
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may add or remove padding 0s from different source
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"""
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s = upc.strip() if upc else ""
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if not re.match(r"^\d+$", s):
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return None
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if len(s) < 13:
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s = s.zfill(13)
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elif len(s) > 13:
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if re.match(r"^0+$", s[0 : len(s) - 13]):
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s = s[len(s) - 13 :]
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else:
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return None
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return s
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