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27 lines
486 B
Python
27 lines
486 B
Python
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import re
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def dna(dna: str) -> str:
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"""
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https://en.wikipedia.org/wiki/DNA
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Returns the second side of a DNA strand
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>>> dna("GCTA")
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'CGAT'
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>>> dna("ATGC")
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'TACG'
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>>> dna("CTGA")
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'GACT'
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>>> dna("GFGG")
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'Invalid Strand'
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"""
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r = len(re.findall("[ATCG]", dna)) != len(dna)
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val = dna.translate(dna.maketrans("ATCG", "TAGC"))
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return "Invalid Strand" if r else val
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if __name__ == "__main__":
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__import__("doctest").testmod()
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