关系操作符:< <= > >= == !=
逻辑运算符:and or not
if condition:
expresstion
else :
expression
if condition:
expression
elif conditon:
expression
else :
expression
关系操作符:< <= > >= == !=
逻辑运算符:and or not
if condition:
expresstion
else :
expression
if condition:
expression
elif conditon:
expression
else :
expression