Check out example codes for "count how many characters in the same position are eqial in both strings". It will help you in understanding the concepts better.

Code Example 1

sum(c1 == c2 for c1, c2 in zip(string1, string2))

Code Example 2

sum(1 if c1 == c2 else 0 for c1, c2 in zip(string1, string2))

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