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dna.py
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importre
defdna(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")
Traceback (most recent call last):
...
ValueError: Invalid Strand
"""
iflen(re.findall("[ATCG]", dna)) !=len(dna):
raiseValueError("Invalid Strand")
returndna.translate(dna.maketrans("ATCG", "TAGC"))
if__name__=="__main__":
importdoctest
doctest.testmod()
