运算方法
# !/usr/bin/python3# -*- coding: utf-8 -*-
# @Time : 2023/2/16 21:00
# @Author : xiongming
# @File : yunsuanfangfa.py
# @Desc : 运算方法
def S(str):
def __add__(self, other):
return len(self) + len(other)
s1 = S("FishC")
s2 = S("Python")
# s1 + s2 == s1.__add__(s2)
# s1 + "Python" 11
# "FishC" + s2 "FishCPython"
def S1(str):
def __add__(self, other):
return NotImplemented
def S2(str):
def __radd__(self, other):
return len(self) + len(other)
s1 = S1("Apple")
s2 = S2("Banana")
# s1 + s2 11
class S3(str):
def __iadd__(self, other):
return len(self) + len(other)
s3 = S3("Apple")
# s3 += s2
# s3 11
# type(s3) <class 'int'>
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