python 示例_带有示例的Python字典pop（）方法

爱被打了一巴掌 2023-03-05 15:54 12阅读 0赞

python 示例

## 字典pop()方法 **(**Dictionary pop() Method**)** ##

**pop() method** is used to remove an item from the dictionary with specified key from the dictionary.

**pop()方法**用于从字典中删除具有指定键的项。

**Syntax:**

**句法：**

dictionary_name.pop(key, value)

**Parameter(s):**

**参数：**

*  key – It represents the specified key whose value to be removed.
    
    key –它代表要删除其值的指定键。
 *  value – It is an optional parameter, it is used to specify the value to be returned if “key” does not exist in the dictionary.
    
    value –这是一个可选参数，用于指定字典中不存在“键”时要返回的值。

**Return value:**

**返回值：**

The return type of this method is the type of the value, it returns the value which is being removed.

此方法的返回类型是值的类型，它返回要删除的值。

**Note**: If we do not specify the value and key does not exist in the dictionary, then method returns an error.

**注意** ：如果我们未指定值并且字典中不存在键 ，则方法将返回错误。

**Example 1:**

**范例1：**

# Python Dictionary pop() Method with Example
    
    # dictionary declaration
    student = {
        
      "roll_no": 101,
      "name": "Shivang",
      "course": "B.Tech",
      "perc" : 98.5
    }
    
    # printing dictionary
    print("data of student dictionary...")
    print(student)
    
    # removing 'roll_no'
    x = student.pop('roll_no')
    print(x, ' is removed.')
    
    # removing 'name'
    x = student.pop('name')
    print(x, ' is removed.')
    
    # removing 'course'
    x = student.pop('course')
    print(x, ' is removed.')
    
    # removing 'perc'
    x = student.pop('perc')
    print(x, ' is removed.')
    
    # printing default value if key does 
    # not exist
    x = student.pop('address', 'address does not exist.')
    print(x)

**Output**

**输出量**

data of student dictionary...
    {'course': 'B.Tech', 'roll_no': 101, 'perc': 98.5, 'name': 'Shivang'}
    101  is removed.
    Shivang  is removed.
    B.Tech  is removed.
    98.5  is removed.
    address does not exist.

Demonstrate the example, if key does not exist and value is not specified.

演示该示例，如果键不存在并且未指定value。

**Example 2:**

**范例2：**

# Python Dictionary pop() Method with Example
    
    # dictionary declaration
    student = {
        
      "roll_no": 101,
      "name": "Shivang",
      "course": "B.Tech",
      "perc" : 98.5
    }
    
    # printing dictionary
    print("data of student dictionary...")
    print(student)
    
    # demonstrating, when method returns an error
    # if key does not exist and value is not specified
    student.pop('address')

**Output**

**输出量**

data of student dictionary...
    {'course': 'B.Tech', 'name': 'Shivang', 'roll_no': 101, 'perc': 98.5}
    Traceback (most recent call last):
      File "main.py", line 17, in <module>
        student.pop('address')
    KeyError: 'address'

> 翻译自: [https://www.includehelp.com/python/dictionary-pop-method-with-example.aspx][https_www.includehelp.com_python_dictionary-pop-method-with-example.aspx]

python 示例

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