Clearing up all the elements in a python list can be done in many ways. Below are the some of the methods which are implemented to achieve this.
using clear()
This function is a part of standard library and empties the python list completely.
Syntax: list_name.clear() list_name is the name of the list supplied by
Example
In the below example we take a list and apply the clear (). The result is an empty list.
list = ['Mon', 'Tue', 'Wed', 'Thu']
print("Existing list\n",list)
#clear the list
list.clear()
print("After clearing the list\n")
print(list)Output
Running the above code gives us the following result −
Existing list ['Mon', 'Tue', 'Wed', 'Thu'] After clearing the list []
Using del()
The del() function you can selectively remove items at a given index or you can also remove all the elements, making the list empty.
Syntax: del list_name
In the below example we take a list, remove the element at index 2. Then we remove all the elements.
Example
list = ['Mon', 'Tue', 'Wed', 'Thu']
print("Existing list\n",list)
#deleting one element from the list
del list[2]
print("After deleting an element\n")
print(list)
# Removing all elements
del list[:]
print("After deleting all elements\n")
print(list)Output
Running the above code gives us the following result −
Existing list ['Mon', 'Tue', 'Wed', 'Thu'] After deleting an element ['Mon', 'Tue', 'Thu'] After deleting all elements []
Using *=0
In this approach we just assign 0 to all elements in the list which makes the list empty. The * is a character representing all elements.
Example
list = ['Mon', 'Tue', 'Wed', 'Thu']
print("Existing list\n",list)
# Removing all elements
list *= 0
print("After deleting all elements\n")
print(list)Output
Running the above code gives us the following result −
Existing list ['Mon', 'Tue', 'Wed', 'Thu'] After deleting all elements []
List Re-Initialization
We can re-initialize a list by just assigning an empty list to it. In the below example we take a list and then assign an empty list to it which creates an empty list.
Example
list = ['Mon', 'Tue', 'Wed', 'Thu']
print("Existing list\n",list)
# Removing all elements
list = []
print("After deleting all elements\n")
print(list)Output
Running the above code gives us the following result −
Existing list ['Mon', 'Tue', 'Wed', 'Thu'] After deleting all elements []