How do I count the occurrences of a list item in Python?
You can use the count() method of a list to count the number of occurrences of an item in the list.
For example:
my_list = ['a', 'b', 'a', 'c', 'a']
print( my_list.count('a') ) # 3
This will return 3, because the element 'a' occurs 3 times in the list.
You can also use the collections module's Counter class to count the occurrences of items in a list.
For example:
from collections import Counter
my_list = ['a', 'b', 'a', 'c', 'a']
count = Counter(my_list)
print( count['a'] ) # 3
This will return a Counter object with the count of each element in the list. You can then access the count of a specific element using the element as the key.
Note that the count() method only works on lists, while the Counter class can be used to count the occurrences of items in any iterable.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
-
How do I concatenate two lists in Python?
You can concatenate two lists in Python by using the + operator or the extend() method. Here is an example using the + operator: list1 = [1, 2, 3] list2 = [4, 5, 6] list3 = list1 + list2 print(list...
Questions -
Finding the index of an item in a Python list?
To find an index of the first occurrence of an element in a given list, you can use index method of List class with the element passed as an argument. The syntax is the following: my_list = [1,2,0,...
Questions -
How to flatten a list in Python?
You can flatten a list in python using the following one-liner: flat_list = [item for sublist in l for item in sublist] In the example above, l is the list of lists that is to be flattened. The pre...
Questions -
How do I check if a list is empty in Python?
You can check if a list is empty by using the len() function to check the length of the list. If the length of the list is 0, then it is empty. Here's an example: my_list = [] if len(my_list) == 0:...
Questions
We are hiring.
Software is our way of making the world a tiny bit better. We build tools for the makers of tomorrow.
Help us in making the internet more reliable.
Help us with developer education and get paid.
Reliability is the
ultimate feature
Delightful observability tools that turn your logs & monitoring into a secret weapon for shipping better software faster.
Explore Better Stack