描述
Python3 列表 clear() 方法用于清空列表，类似于 del a[:]。
语法
clear() 方法语法：
L.clear()参数
- 无。
返回值
该方法没有返回值。
实例
以下实例展示了 clear() 方法的使用方法：
#!/usr/bin/python3 L1 = ['Google', 'Runoob', 'Taobao', 'Baidu'] L1.clear() print ("列表清空后 : ", L1)以上实例输出结果如下：
列表清空后 : []转载于:https://www.cnblogs.com/wushuaishuai/p/7729182.html
python 示例
列出clear()方法 (List clear() Method)
clear() method is used to clear a list i.e. it is used to remove all elements from the list.
clear()方法用于清除列表，即用于从列表中删除所有元素。
Syntax:
句法：
list_name.clear()Parameter(s):
参数：
It does not accept any parameter.
它不接受任何参数。
Return value:
返回值：
The return type of this method is <class 'NoneType'>, it returns nothing.
此方法的返回类型为<class'NoneType'> ，它什么也不返回。
Example 1:
范例1：
# declaring a list cities = ["New Delhi", "Mumbai", "Banglore"] # printing elements before clearing the list print("Before clear() method...") print("cities = ", cities) # clearing the list cities.clear() # printing elements after clearing the list print("After clear() method...") print("cities = ", cities)Output
输出量
Before clear() method... cities = ['New Delhi', 'Mumbai', 'Banglore'] After clear() method... cities = []Example 2:
范例2：
# declaring the lists x = ["ABC", "XYZ", "PQR"] y = ["PQR", "MNO", "YXZ"] z = ["123", "456", "789"] # printing sets before clearing the list print("Before clear() method...") print("x: ", x) print("y: ", y) print("z: ", z) # clearing the lists x.clear() y.clear() z.clear() # printing sets after clearing the list print("After clear() method...") print("x: ", x) print("y: ", y) print("z: ", z)Output
输出量
Before clear() method... x: ['ABC', 'XYZ', 'PQR'] y: ['PQR', 'MNO', 'YXZ'] z: ['123', '456', '789'] After clear() method... x: [] y: [] z: []翻译自: https://www.includehelp.com/python/list-clear-method-with-example.aspx
python 示例
目录
list.clear() ->该函数无参数，无返回值In [49]: target =[1, 2, 3, 4, 5, 6]
In [50]: target.clear()
In [51]: print(target)
[]
clear函数比直接定义一个空列表更节省性能# coding:utf-8
mixs = ['python', 1, (1,), {'name': 'insane'}]
print(mixs, len(mixs))
mixs.clear()
print(mixs, len(mixs))
['python', 1, (1,), {'name': 'insane'}] 4
[] 0
Process finished with exit code 0
Python 3 列表方法 clear( )
Python 3.8.5
语法格式：
list.clear()描述：
# clear() 方法只是清空了列表里的内容，列表变成空列表，但列表依然存在
>>> list = ['大头', '儿子']
>>> list.clear()
>>> list
[]# 调用 clear() 方法后，已经赋值给其它变量的列表也会被清空。
>>> list_1 = ['A', 'B', 'C', 'D']
>>> list_2 = list_1
>>> list_1.clear()
>>> list_1
[]
>>> list_2
[]
