Python（二）运算类型

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本文介绍了Python中的运算类型，包括数学运算、赋值运算、逻辑运算、比较运算和关系运算。详细讲解了各运算符的用法，如加减乘除、幂、取余等，并探讨了字典在关系运算中的特殊性，特别是is和in运算符在不同数据类型上的表现。

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运算类型

>数学运算

+（加）；-（减）；*（乘）；/（除）；**（幂）；//（整除）；%（取余）

#数学运算
#author：xuer

print("1.加法")
print("1+2 =",1+2)

print("2.减法")
print("3-2 =",3-2)

print("3.乘法")
print("2*3 =",2*3)

print("4.除法")
print("6/2 =",6/2)

print("5.幂")
print("2**4 =",2**4)

print("6.整除")
print("10//3 =",10//3)

print("7.取余")
print("7%2 =",7%2)

>赋值运算

= += -= *= /= **= //= %=

#赋值运算
#author：xuer

print("a=1")
a=1
print("a =",a)

print("a+=2")
a+=2
print("a =",a)

print("a-=1")
a-=1
print("a =",a)

print("a*=3")
a*=3
print("a =",a)

print("a/=2")
a/=2
print("a =",a)

print("a**=4")
a**=4
print("a =",a)

print("a//=7")
a//=7
print("a =",a)

print("a%=4")
a%=4
print("a =",a)

>逻辑运算

and or not
and判断两个值，按顺序判断，若都为true则返回后一个值
or判断两个值，按顺序判断，若第一个为true则返回该值
not的返回值为：True，False

#逻辑运算
#author：xuer

print("1 and 2 =",1 and 2)
print("2 and 1 =",2 and 1)  #and判断两个值，按顺序判断，若都为true则返回后一个值
print("0 and 1 =",0 and 1)
print("1 and 0 =",1 and 0)

print("1 or 2 =",1 or 2)
print("2 or 1 =",2 or 1)    #or判断两个值，按顺序判断，若第一个为true则返回该值
print("0 or 1 =",0 or 1)
print("1 or 0 =",1 or 0)

print("not 1 =",not 1)
print("not 0 =",not 0)    #not的返回值为：True，False

>比较运算

> < == >= <= !=
返回值为：True，False

#比较运算
#author：xuer

print("3 > 2",3>2)
print("1 > 2",1>2)

print("2 < 3",2<3)
print("4 < 3",4<3)

print("4 == 5",4==5)
print("6 == 6",6==6)

print("1 >= 2",1>=2)
print("4 >= 3",4>=3)

print("1 <= 2",1<=2)
print("2 <= 1",2<=1)

print("1 != 2",1!=2)
print("1 != 1",1!=1 )

>关系运算

in not in is is not
返回值为：True，False
数字、字符串、元组是不变量，则is运算时，两者相同时为True
列表、集合、字典是可变量，则is运算时，即使两者相同也为False

#关系运算
#author：xuer

print("m=11")
m=11
print("n=66")
n=66
print("s=[11,22,33,44,55]")
s=[11,22,33,44,55]
print("m in s ",m in s)
print("n not in s ",n not in s)

print("a=6")
a=6
print("b=6")
b=6
print("a is b ",a is b)
print("a is not b ",a is not b) #数字、字符串、元组是不变量，则两者相同时为True

print("c=[1,2,3]")
c=[1,2,3]
print("d=[1,2,3]")
d=[1,2,3]
print("c is d ",c is d)
print("c is not d ",c is not d) #列表、集合、字典是可变量，则即使两者相同也为False

字典的关系运算

字典默认索引为key值
若想直接索引value值，需使用d.values()

#字典的关系运算
#author：xuer

print("p=99")
p=99
print('d1={"1":99,"2":88,"3":77,"4":66}')
d1={"1":99,"2":88,"3":77,"4":66}
print("p in d1 ",p in d1)
print("p in d1.values ",p in d1.values())