Checking if a List is Empty in Python
Problem:Explain how to check if a list is empty in Python, and provide examples to illustrate various methods for performing this check.
Solution:In Python, there are multiple ways to check if a list is empty. Here are some common methods:
Using the len() function:
The len () function returns the number of elements in a list. To check if a list is empty, you can use len(your_list) == 0.
my_list = [ ]
if len(my_list) == 0 :
print( " The list is empty . " )
Using the Truthiness of Lists:
In Python, an empty list evaluates to False in a boolean context, while a non-empty list evaluates to True. You can use this property to check if a list is empty.
my_list = [ ]
if not my_list:
print(" The list is empty . " )
Using Explicit Comparison with an Empty List:
You can explicitly compare the list to an empty list [] to check for emptiness.
my_list = [ ]
if my_list = = [ ] :
print(" The list is empty . " )
Using the any() function with List Comprehension:
You can use the any ( ) function in combination with a list comprehension to check if any elements meet a specific condition. In this case, you can check if there are any elements in the list.
my_list = [ ]
if not any(my_list):
print( " The list is empty . " )
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