Encode a Run-Length Style String

EasyPython

Problem

Encode a string as 'frequency + character', e.g. "aabccc" is encoded as "2a1b3c".

Asked in the online screening test stage. Q1 of 2; the wording was reported as very easy.

Input and Output

Implement encode_string(s), which accepts a string and returns a string containing one count + character segment for each consecutive run. Counts must be written as decimal integers, and character order must be preserved.

Constraints

0 <= len(s) <= 10^5
The input contains printable characters
Counts must be represented as decimal integers
Consecutive runs, not total character frequencies, are encoded

Function Signature

def encode_string(s):

CodePython 3

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