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def count_substring(string, sub_string):
l=len(string)
count = 0
for i in range(l-len(sub_string) + 1):
if string[i:i + len(sub_string)] == sub_string:
count=count+1
return count
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def count_substring(string, sub_string): l=len(string) count = 0 for i in range(l-len(sub_string) + 1): if string[i:i + len(sub_string)] == sub_string: count=count+1