Can anyone explain this code?

Question

https://code.sololearn.com/cYQngYd7YWBA/?ref=app

Answer 1

string.count(sub, i, i+len(sub))

is equivalent to

string[i:i+len(sub)] == sub

because slice length is never longer than sub length so it does somehing like this:
find('abcabcd', 'abc')
count += abc == abc
count += bca == abc
...
count += bcd == abc

Answer 2

str.count(substr, start, end) returns non overlapping occurences of substr in str[start:end]

this function returns all occurences including overlapping so
'aaa'.count('aa') returns 1 but this function returns 2

Answer 3

The function basically counts the number of occurrences of another smaller string in a larger string:
string = "this is a string"
sub_string = "is"
Number of occurrences = 2 # because there are two "is" in "this is a string"

However I see no purpose of that implementation because str.count(substring) already returns the number of occurrences

Answer 4

Mert Yazıcı i know but how does the code do that can you please explain

Answer 5

thanks