Python 中清除列表的不同方式
有许多方法可以通过 Python 语言提供的不同构造的方法来清除列表。让我们试着逐一理解每种方法。
-
Method #1 : Using
clear()method```py
Python program to clear a list
using clear() method
Creating list
GEEK = [6, 0, 4, 1] print('GEEK before clear:', GEEK)
Clearing list
GEEK.clear() print('GEEK after clear:', GEEK) ```
输出:
```py GEEK before clear: [6, 0, 4, 1] GEEK after clear: []
```
-
Method #2 : Reinitializing the list : The initialization of the list in that scope, initializes the list with no value. i.e list of size 0. Let’s see the example demonstrating Method 1 and 2 to clear list
```py
Python3 code to demonstrate
clearing a list using
clear and Reinitializing
Initializing lists
list1 = [1, 2, 3] list2 = [5, 6, 7]
Printing list1 before deleting
print ("List1 before deleting is : " + str(list1))
deleting list using clear()
list1.clear()
Printing list1 after clearing
print ("List1 after clearing using clear() : " + str(list1))
Printing list2 before deleting
print ("List2 before deleting is : " + str(list2))
deleting list using reinitialization
list2 = []
Printing list2 after reinitialization
print ("List2 after clearing using reinitialization : " + str(list2)) ```
输出:
```py List1 before deleting is : [1, 2, 3] List1 after clearing using clear() : [] List2 before deleting is : [5, 6, 7] List2 after clearing using reinitialization : []
```
-
Method #3 : Using “*= 0” : This is a lesser known method, but this method removes all elements of the list and makes it empty.
```py
Python3 code to demonstrate
clearing a list using
*= 0 method
Initializing lists
list1 = [1, 2, 3]
Printing list1 before deleting
print ("List1 before deleting is : " + str(list1))
deleting list using *= 0
list1 *= 0
Printing list1 after *= 0
print ("List1 after clearing using *= 0: " + str(list1)) ```
输出:
py List1 before deleting is : [1, 2, 3] List1 after clearing using *= 0: [] -
Method #4 : Using del : del can be used to clear the list elements in a range, if we don’t give a range, all the elements are deleted.
```py
Python3 code to demonstrate
clearing a list using
del method
Initializing lists
list1 = [1, 2, 3] list2 = [5, 6, 7]
Printing list1 before deleting
print ("List1 before deleting is : " + str(list1))
deleting list1 using del
del list1[:] print ("List1 after clearing using del : " + str(list1))
Printing list2 before deleting
print ("List2 before deleting is : " + str(list2))
deleting list using del
del list2[:] print ("List2 after clearing using del : " + str(list2)) ```
输出:
```py List1 before deleting is : [1, 2, 3] List1 after clearing using del : [] List2 before deleting is : [5, 6, 7] List2 after clearing using del : []
```
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