Python 运算符 - 快速参考

Python 运算器允许我们对变量进行共同处理,我们将以示例和运算器优先级来研究不同类型的运算器,它们是能够操纵一个或多个运算符的值的特殊符号。

Python 操作员列表

Python 操作员可以分为几个类别。

配置运算符
算术运算符
逻辑运算符
比较运算符
Bitwise运算符

Python 任务操作员

分配操作员包括等于签名 (=)的基本分配操作员。

但是,为了简化代码,并减少冗余,Python还包括算术分配操作员。

这包括用于添加分配的 += Python 操作员, //=地板分配分配操作员等。

以下是 Python 中的所有算术分配运算符的列表。

Operator	Description
+=	a+=b is equivalent to a=a+b
*=	a=b is equivalent to a=ab
/=	a/=b is equivalent to a=a/b
%=	a%=b is equivalent to a=a%b
**=	a=b is equivalent to a=ab (exponent operator)
//=	a//=b is equivalent to a=a//b (floor division)

使用分配操作员

 1# take two variable, assign values with assignment operators
 2a=3
 3b=4
 4
 5print("a: "+str(a))
 6print("b: "+str(b))
 7
 8# it is equivalent to a=a+b
 9a+=b
10
11print("a: "+str(a))
12print("b: "+str(b))
13
14# it is equivalent to a=a*b
15a*=b
16print("a: "+str(a))
17print("b: "+str(b))
18
19# it is equivalent to a=a/b
20a/=b
21print("a: "+str(a))
22print("b: "+str(b))
23
24# it is equivalent to a=a%b
25a%=b
26print("a: "+str(a))
27print("b: "+str(b))
28
29# it is equivalent to a=a**b ( exponent operator)
30a**=b
31print("a: "+str(a))
32print("b: "+str(b))
33
34# it is equivalent to a=a//b ( floor division)
35a//=b
36print("a: "+str(a))
37print("b: "+str(b))

Python Assignment Operators

Python 算术运算器

Operator	Description	Example
+	used to add two numbers	sum = a + b
–	used for subtraction	difference = a – b
*	used to multiply two numbers. If a string and int is multiplied then the string is repeated the int times.	mul = ab>>> `Hi`5
‘HiHiHiHiHi’
/	used to divide two numbers	div = b/a
%	modulus operator, returns the remainder of division	mod = a%b
**	exponent operator

 1#create two variables
 2a=100
 3b=200
 4
 5# addition (+) operator
 6print(a+b) 
 7
 8# subtraction (-) operator
 9print(a-b) 
10
11# multiplication (*) operator
12print(a*b)
13
14# division (/) operator
15print(b/a)
16
17# modulus (%) operator
18print(a%b) # prints the remainder of a/b
19
20# exponent (**) operator
21print(a**b) #prints a^b

Output: Python Arithmetic Operators

Python 操作器比较

Operator	Description	Example
==	returns True if two operands are equal, otherwise False.	flag = a == b
!=	returns True if two operands are not equal, otherwise False.	flag = a != b
>	returns True if left operand is greater than the right operand, otherwise False.	flag = a > b
<	returns True if left operand is smaller than the right operand, otherwise False.	flag = a < b
>=	returns True if left operand is greater than or equal to the right operand, otherwise False.	flag = a > b
<=	returns True if left operand is smaller than or equal to the right operand, otherwise False.	flag = a < b

 1# create two variables
 2a=100
 3b=200
 4
 5# (==) operator, checks if two operands are equal or not
 6print(a==b)
 7
 8# (!=) operator, checks if two operands are not equal
 9print(a!=b)
10
11# (>) operator, checks left operand is greater than right operand or not
12print(a>b)
13
14# (<) operator, checks left operand is less than right operand or not
15print(a<b)
16#(>=) operator, checks left operand is greater than or equal to right operand or not
17print(a>=b)
18
19# (<=) operator, checks left operand is less than or equal to right operand or not
20print(a<=b)

Python Comparison Operators

Python Bitwise 操作员

Operator	Description	Example
&	Binary AND Operator	x = 10 & 7 = 2
		Binary OR Operator
^	Binary XOR Operator	x = 10 ^ 7 = 13
~	Binary ONEs Compliment Operator	x = ~10 = -11
<<	Binary Left Shift operator	x = 10<<1 = 20
>>	Binary Right Shift Operator	x = 10>>1 = 5

 1#create two variables
 2a=10 # binary 1010
 3b=7  # binary 0111
 4
 5# Binary AND (&) operator, done binary AND operation
 6print(a&b)
 7
 8# Binary OR (|) operator, done binary OR operation
 9print(a|b)
10
11# Binary XOR (^) operator, done binary XOR operation
12print(a^b)
13
14# Binary ONEs Compliment (~) operator, done binary One's Compliment operation
15print(~a)
16
17# Binary Left Shift (<<) operator, done binary Left Shift operation
18print(a<<1) 
19# Binary Right Shift (>>) operator, done binary Right Shift operation
20print(a>>1)

Python Bitwise Operators

Python 逻辑操作器

Operator	Description	Example
and	Logical AND Operator	flag = exp1 and exp2
or	Logical OR Operator	flag = exp1 or exp2
not	Logical NOT Operator	flag = not(True) = False

 1#take user input as int
 2a=int(input())
 3
 4# logical AND operation
 5
 6if a%4==0 and a%3==0:
 7    print("divided by both 4 and 3")
 8
 9# logical OR operation
10if a%4==0 or a%3==0:
11    print("either divided by 4 or 3")
12
13# logical NOT operation
14if not(a%4==0 or a%3==0):
15    print("neither divided by 4 nor 3")

Python Logical Operators

Python 操作器先行性

这些运算符的优先级意味着运算符的优先级级别. 当一个表达式有多个运算符时,这变得至关重要。

1>>> 2+3*4

现在,你认为操作序列会是什么呢?我们可以添加2和3,然后以4来倍增结果,此外,我们可以先倍增3和4,然后添加2。

下面列出了指示优先级级的操作员列表,它以下降顺序进行,这意味着上方的组比下方的组具有更大的优先级。

Parenthesis – ()
Exponentiation – **
Compliment, unary plus and minus – ~, +, -
Multiply, Divide, modulo – *, /, %
Addition and Subtraction – +, -
Right and Left Shift – >>, <<
Bitwise AND – &
Bitwise OR and XOR – |, ^
Comparison Operators – ==, !=, >, <, >=, <=
Assignment Operator- =