How to create a strand count? [closed]

by

May be you want this:

import re

def rna_strand_count(test_string,sub_string):
    test_string = test_string.replace(' ','').upper()    
    sub_string = sub_string.replace(' ','').upper()    
    first = sub_string[0]
    second = sub_string[1:]
    return {sub_string:len(re.findall(r'{0}(?={1})'.format(first,second),test_string))}


print rna_strand_count('AAAA','AA')

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