Python Check if a List is Empty
In Python, it is very simple to check whether a list is empty. We can directly use theifstatement to check whether the length of the list is 0, or directly check whether the list itself isFalse。
Example
my_list = []
# Method 1: Check whether the length of the list is 0
if len(my_list) == 0:
print("The list is empty")
else:
print("The list is not empty")
# Method 2: Directly check whether the list is False
if not my_list:
print("The list is empty")
else:
print("The list is not empty")
# Method 1: Check whether the length of the list is 0
if len(my_list) == 0:
print("The list is empty")
else:
print("The list is not empty")
# Method 2: Directly check whether the list is False
if not my_list:
print("The list is empty")
else:
print("The list is not empty")
Code explanation:
len(my_list) == 0：len()The function returns the length of the list. If the length is 0, the list is empty.not my_list: In Python, an empty list is consideredFalse, thereforenot my_listwill return when the list is emptyTrue。
Output result:
Empty list
Both methods can effectively determine whether a list is empty. Which method to choose depends on personal preference.
Other extensions