How do I check if a list is empty in Python?

Often, we need to check if a list is empty . in this Python example we will discuss some o the ways to create a dictionary from separate lists in Python.

Some of the topics which will be helpful for understanding the program implementation better are:

• List in Python
• Function in Python

1. Using the len() function

This function returns the number of elements in a list. If a list is empty, len() will return 0,

Now let’s implement a program to check if a list is empty.

fruits = []

if len(fruits) == 0:
  print("The list is empty")
else:
  print("The list is not empty")

Output
The list is empty

2. Using the not operator

The not operator is a logical operator that reverses the truth value of a boolean expression. If a list is empty, the boolean expression not fruits will evaluate to True.

Now lets implement the example again

fruits = []

if not fruits:
  print("The list is empty")
else:
  print("The list is not empty")

Output
The list is empty

3. Using the == operator

This operator compares two values and returns True if they are equal, and False otherwise.

fruits = []

if fruits == []:
  print("The list is empty")
else:
  print("The list is not empty")

Output
The list is empty

4. Using bool() operator

The bool() function returns the boolean value of an object. If a list is empty, bool(fruits) will return False.

fruits = []

if not bool(fruits):
  print("The list is empty")
else:
  print("The list is not empty")

Output
The list is empty

5. Conclusion

In this Python example, we discussed how to use the len() function, the not operator, the == operator, or the bool() function to check if a list is empty in Python.

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Complete code samples are present on Github project.

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