Python > String-2 chance

Medium python string problems -- 1 loop.. Use + to combine strings, len(str) is the number of chars in a String, str[i:j] extracts the substring starting at index i and running up to but not including index j.

double_char H	count_hi H	cat_dog
count_code	end_other H	xyz_there

See also Python Example Code. Python help docs: Python Strings | Python Lists | Python If Boolean

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