python入门学习笔记（四）——if语句

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5. if语句

5.1  简单if语句

sum = 20;

if sum < 19:

    print('OK')

    

 

5.2  if-else语句

name = ['sss','dddd','eeee']

if name == 'cccc':

    print('OK')

else:

    print('NO')

##########################

NO

5.3 if-elif-elif(多条件)

age = 12

if age < 4 :

    print('年龄小于四岁。')

elif age < 10 :

    print('年龄大于等于四岁，小于十岁。')

elif age > 10 :

    print('年龄大于十岁。')

5.4 if-elif-elif-else（多条件）

age = 12

if age < 4:

    print('年龄小于四岁')

elif age <10:

    print('年龄小于十岁大于等于四岁')

else:

    print('年龄大于等于十岁')

5.5 and和or 类似逻辑运算符 &&和||

age = 12

if age < 4 and age < 8:

    print('pa = 0')

 

else:

    print('pa = 1')

######################

pa = 1