python逻辑if语句 Python初识逻辑与if语句及用法大全
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逻辑判断与逻辑语句
- 对于─件事情正确与否(真假的判断) √ X
- 根据判断的结果做不同的事情,就是我们的逻辑业务
- 对于条件满足的判断语句,就是条件语句
- 一个逻辑语句是由条件语句和业务语句组合而成
if语句功能
判断一个命题的真实性,如果命题为真( True )则执行if的逻辑语句
if语句用法
用法:
if bool_result: # 语法块 do # 业务代码块注意缩进
参数︰
-
bool_result
: 判断结果的真假,布尔类型 do
: 如果bool_result为True时执行任意python代码
返回值: if属于关键字,没有返回值
>>> insane_status = 'hunger >>> if insane_status == 'hunger': print( 'xiaomu invites Insane to dinner' ) xiaomu invites Insane to dinner
实战
# coding:utf-8 info = 'my name is insane' info_list = info.split() print(info_list) if info_list[0] == 'insane': print(1) info_list[0] = 'loafer' if info_list[1] == 'insane': print(2) info_list[1] = 'loafer' if info_list[2] == 'insane': print(3) info_list[2] = 'loafer' if info_list[-1] == 'insane': print(4) info_list[-1] = 'loafer' print(info_list) info = ' '.join(info_list) print(info) info = 'my name is insane, i am a pythoner, i love python' info_list = info.split() if info_list[0] in ['python', 'i']: info_list[0] = '*' if info_list[1] == 'python' or info_list[1] == 'i': info_list[1] = '*' if info_list[2] == 'python' or info_list[2] == 'i': info_list[2] = '*' if info_list[3] == 'python' or info_list[3] == 'i': info_list[3] = '*' if info_list[4] == 'python' or info_list[4] == 'i': info_list[4] = '*' if info_list[5] == 'python' or info_list[5] == 'i': info_list[5] = '*' if info_list[6] == 'python' or info_list[6] == 'i': info_list[6] = '*' if info_list[7] == 'python' or info_list[7] == 'i': info_list[7] = '*' if info_list[8] == 'python' or info_list[8] == 'i': info_list[8] = '*' if info_list[9] == 'python' or info_list[9] == 'i': info_list[9] = '*' if info_list[-1] in ['python', 'i']: info_list[-1] = '*' print(info_list) info = ' '.join(info_list) print(info) info = 'my name is insane' print(len(info)) if len(info) > 10 and len(info) != 15: print(info.replace('insane', 'loafer')) if len(info) > 10 and len(info) != 17: print(info.replace('name', 'iop')) print('finish')
['my', 'name', 'is', 'insane'] 4 ['my', 'name', 'is', 'loafer'] my name is loafer ['my', 'name', 'is', 'insane,', '*', 'am', 'a', 'pythoner,', '*', 'love', '*'] my name is insane, * am a pythoner, * love * 17 my name is loafer finish Process finished with exit code 0
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