Python = vs ==

不念不忘少年蓝@ 2022-12-07 13:27 154阅读 0赞

Hello everyone, in this tutorial you’ll see what’s the difference between = and == in python. Most of new programmers get confused with them.

大家好，在本教程中，您将看到python中=和==之间的区别是什么。 大多数新程序员对它们感到困惑。

## Python = vs == **(**Python = vs ==**)** ##

### =(赋值运算符) **(**= (assignment operator)**)** ###

Well, in simple words, ‘=’** **is an assignment operator which is used to assign a value (on right side) to a variable (on left side).

好吧，简单来说，'=' ** ** 是一个赋值运算符，用于将一个值(在右侧)分配给一个变量(在左侧)。

**Example:**

**例：**

*var\_name = 10*

here var\_name is a variable name and 10 is the value to be assigned, we’re using ‘=’ to assign it.

这里var\_name是变量名，10是要分配的值，我们使用'='进行分配。

**Example Programs:**

**示例程序：**

#example 1
    n = 10
    print("n = ", n)

**Output****:**

**输出** **：**

*n = 10*

#example  2
    n1 = 10
    n2 = 20
    sum = n1 + n2
    print("sum = ", sum)

**Output:**

**输出：**

*sum = 30*

*总和= 30*

As in above program, we can also write an expression on the right side of  ‘=’ . the result of that expression will be assigned to the variable on left side.

和上面的程序一样，我们也可以在'='的右侧写一个表达式。 该表达式的结果将分配给左侧的变量。

#example  3
    n1,n2 = 10,20
    print("n1 = " , n1)
    print("n2 = " , n2)

**Output:**

**输出：**

*n1 = 10*

*n2 = 20*

In python, we can also assign more than one value at once using commas.

在python中，我们还可以使用逗号一次分配多个值。

#example 4
    n = input("please enter your name:")
    print("name = " + n)

**Output:**

**输出：**

*please enter  your name :  crazy programmer*

*请输入您的姓名：疯狂的程序员*

*name =  crazy programmer*

*名字=疯狂的程序员*

The value received by input() function will be assigned to variable ‘n’.

input()函数接收的值将分配给变量'n'。

### **==(等于运算符)** **(****==  (equal to operator)****)** ###

“==” equal to operator is a relational operator just like “!=”, “<=”. It is used to compare the operands on both of its side. It returns a boolean value (true or false), when both operands are equal then it returns ‘true’ otherwise ‘false’. Mostly it is used in conditional statements.

等于运算符的“ ==”是关系运算符，就像“！=”，“ <=”一样。 它用于比较其两侧的操作数。 它返回一个布尔值(真或假)，当两个操作数相等时，它返回“真”，否则返回“假”。 通常，它用于条件语句中。

**Example Programs:**

**示例程序：**

#example 1
    n = 10
    print(n == 12)

**Output:**

**输出：**

*False*

*假*

In above program, the operands on both side of ‘==’ will be compared with each other. If they are equal then program will print “True”, if not then it will print “False”. The output of above program will be ‘False’ because ‘n’ is not equal to ‘12’.

在上面的程序中，'=='两侧的操作数将相互比较。 如果它们相等，则程序将打印“ True”，否则，将打印“ False”。 上面程序的输出将为“ False”，因为“ n”不等于“ 12”。

#example 2
    name = input("enter your name:")
    if(name == "xyz"):
      print("login successful")
    else:
      print("login unsuccessful")

**Output: **

**输出：**

*enter your name: xyz*

*输入您的名字：xyz*

*login successful*

*登陆成功*

In this program first user will enter a name then interpreter will check the condition. Inside the if statement we wrote ‘name == “xyz”’. If the name entered by user is ‘xyz’ then it will return ‘True’ otherwise ‘False’. In output window we’re entering ‘xyz’ as name then the ‘if’ will be true and will print “login successful”.

在该程序中，第一个用户将输入一个名称，然后解释器将检查条件。 在if语句中，我们写了'name ==“ xyz”'。 如果用户输入的名称是“ xyz”，则它将返回“ True”，否则返回“ False”。 在输出窗口中，我们输入“ xyz”作为名称，然后“ if”为真，并显示“ login success”。

I hope your doubt has been cleared. If you have any problem related with this article then please comment below, we’ll reply as soon as possible.

希望您的疑虑已经消除。 如果您有与本文相关的任何问题，请在下面发表评论，我们将尽快答复。

> 翻译自: [https://www.thecrazyprogrammer.com/2018/02/python-equal-vs-double-equal.html][https_www.thecrazyprogrammer.com_2018_02_python-equal-vs-double-equal.html]

[https_www.thecrazyprogrammer.com_2018_02_python-equal-vs-double-equal.html]: https://www.thecrazyprogrammer.com/2018/02/python-equal-vs-double-equal.html