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python中两个数组的减法运算 python两数求减法

前端2024-05-09 22:55:53

运算符:

1、算数运算符
2、赋值运算符
3、比较运算符
4、逻辑运算符
5、成员运算符
6、身份运算符
7、位运算符
8、运算符优先级
9、思维导图式整理（可以最后看这里）

1、算数运算符

1、加法

a, b = 4, 2
print a+b # 6

2、减法

a, b = 4, 2
print a-b # 2

3、乘法

a, b = 4, 2
print a*b # 8

4、除法

a, b = 4, 2
print a/b # 2

5、取余数

a, b = 4, 2
print a%b # 0

6、幂运算

a, b = 4, 2
print a**b # 16

7、向下取整数

a, b = 4, 2
print a // b # 2

2、赋值运算符

1、简单赋值

a = 5
c = a
print c # 5

2、加法赋值

a, c = 1, 2
c += a
print c # 3

3、减法赋值

a, c = 1, 2
c -= a
print c # 1

4、乘法赋值

a, c = 1, 2
c *= a
print c # 2

5、除法赋值

a, c = 1, 2
c /= a
print c  # 2

6、取余数赋值

a, c = 1, 2
c %= a
print c # 0

7、幂运算赋值

a, c = 2, 3
c **= a
print c # 9

8、向下取整赋值

a, c = 2, 5
c //= a
print c # 2

3、比较运算符

1、等于 == 用于判断值是否相等

a, b, c = 1, 2, 1
print a == b # False
print a == c # True

2、不等于

a, b, c = 1, 2, 1
print a != b # True
print a != c # False

3、大于

a, b, c = 1, 2, 1
print a > b # False
print a > c # False

4、小于

a, b, c = 1, 2, 1
print a < b # True
print a < c # False

5、大于等于

a, b, c = 1, 2, 1
print a >= b # False
print a >= c # True

6、小于等于

a, b, c = 1, 2, 1
print a <= b # True
print a <= c # True

4、逻辑运算符

1、逻辑与 and

a, b = 1, 2
q, w = True, False
print a and b # 2
print q and w # False

2、逻辑或 or

a, b = 1, 2
q, w = True, False
print a or b # 1
print q or w # True

3、逻辑非 not

a, b = 1, 2
q, w = True, False
print not a  # False
print not q # False

5、成员运算符

1、变量存在指定的的序列中 in

a = 'aa'
str = 'dfaaefdsccasda'
list = [1, 2, 'a', 4312]
tuple = ('aa', 1, 2)
print a in str # True
print a in list # False
print a in tuple # True

2、变量不存在指定的序列中 not in

a = 'aa'
str = 'dfaaefdsccasda'
list = [1, 2, 'a', 4312]
tuple = ('aa', 1, 2)
print a not in str # False
print a not in list # True
print a not in tuple # False

6、身份运算符

1、两个标识来自同一个对象(同一块内存空间) is

a, b, c = 1, 2, 1
print a is b # False
print a is c # True

aa = [1, 2, 3]
bb = aa
cc = aa[:]
print aa is bb # True
print aa == bb # True
print aa is cc # False
print aa == cc # True

2、两个标识不是来自同一个对象(同一块内存空间) is not

a, b, c = 1, 2, 1
print a is not b # True
print a is not c # False

aa = [1, 2, 3]
bb = aa
cc = aa[:]
print aa is not bb # False
print aa is not cc # True