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#!/usr/bin/env python3
# -*- coding:utf-8 -*-
from functools import reduce
CHAR_TO_INT = {
'0': 0,
'1': 1,
'2': 2,
'3': 3,
'4': 4,
'5': 5,
'6': 6,
'7': 7,
'8': 8,
'9': 9
}
def str2int(s):
ints = map(lambda ch: CHAR_TO_INT[ch], s)
return reduce(lambda x, y: x * 10 + y, ints)
print(str2int('666'))