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add the dna algorithm (#6323)

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* adding the dna algorithm

* following bot recommendations

following bot recommendations for the indentation

* following bot recommendations

following bot recommendations regarding indentation [ again ]

* following bot recommendations

following bot recommendations regarding indentation [ again. ]

* following bot recommendations

following bot recommendations.
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Margaret 2022-09-05 04:51:11 +03:00 committed by GitHub
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import re
def dna(dna: str) -> str:
"""
https://en.wikipedia.org/wiki/DNA
Returns the second side of a DNA strand
>>> dna("GCTA")
'CGAT'
>>> dna("ATGC")
'TACG'
>>> dna("CTGA")
'GACT'
>>> dna("GFGG")
'Invalid Strand'
"""
r = len(re.findall("[ATCG]", dna)) != len(dna)
val = dna.translate(dna.maketrans("ATCG", "TAGC"))
return "Invalid Strand" if r else val
if __name__ == "__main__":
__import__("doctest").testmod()