Python初识逻辑与if语句及用法大全

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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