Python编程：Python2和Python3下的translate函数字符映射替换

# -*- coding: utf-8 -*-
import string
trantab = string.maketrans("123", "ABC")
s = "123 456"
ret = s.translate(trantab)
print(ret) # ABC 456

unicode 的translate方法的映射表也就是字典的键必须是unicode的位序数
值可以是unicode的位序数、unicode字符串或这None
# -*- coding: utf-8 -*-
from __future__ import unicode_literals, print_function
dct = {
    ord("1"): "AA",
    ord("2"): "BB",
    ord("3"): "CC"
}
s = "123456"
ret = s.translate(dct)
print(ret) # AABBCC456

# 参数： 原始字符表，转换字符表，删除字符表
table = str.maketrans("123", "ABC", "4")
s = "1234"
ret = s.translate(table)
print(ret)  # ABC

dct = {
    "1": "AA",
    "2": "BB",
    "3": "CC"
}
table = str.maketrans(dct)
s = "1234"
ret = s.translate(table)
print(ret)  # AABBCC4