What did I do wrong with this function?
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Felipe Galdino Campos
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Published on 2012-10-21T22:54:43Z
Indexed on
2012/10/21
23:00 UTC
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Filed under:
python
I don't know what I did - it's wrong . Can someone help me?
def insert_sequence(dna1, dna2, number):
'''(str, str, int) -> str
Return the DNA sequence obtained by inserting the second DNA sequence
at the given index. (You can assume that the index is valid.)
>>> insert_sequence('CCGG', 'AT', 2)
'CCATGG'
>>> insert_sequence('TTGC', 'GG', 2)
'TTGGGC'
'''
index = 0
result = '';
for string in dna1:
if index == number:
result = result + dna2
result = result + string
index += 1
print(result)
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