Python List count()In this tutorial, we will learn about the Python List count() method with the help of examples. Show
The count() method returns the number of times the specified element appears in the list. Example# create a list numbers = [2, 3, 5, 2, 11, 2, 7]# check the count of 2 count = numbers.count(2) print('Count of 2:', count) # Output: Count of 2: 3Python List Count With ExamplesPython Lists can contain objects of the same type or of different types. For example, a List can contain all items as Integer or items as integer, String, boolean etc. The length of the list can be identified using the len() and using for loop. Using Len() FunctionIn Python, you can find the length of the list using the len() function. Use the below snippet to get the count of elements in list. Snippet list = ['a','b','c'] len(list)There are 3 elements in the list. You’ll see the output as 3. Output 3You’ve calculated the items in the list which have the same type of values. Next, you’ll see the list with different types of items. Count List with Different Type of Items The example list contains one character, one number, one boolean value, and one value None which is used to denote the missing data. However, when a list has None, it is also counted as one element while using len() function. Snippet list = ['a',1, True, None] len(list)The example list has 4 values including None. Hence, you’ll see the output 4. Output 4This is how you can get the number of elements in the list using the len() function. This is also known as finding list length. Next, you’ll learn how to use for loop. Using For LoopIn this section, you’ll learn how to count the number of elements in a list using the for loop. for loop is used to iterate over a sequence of values. To get the number of elements in the list, you’ll iterate over the list and increment the counter variable during each iteration. Once the iteration is over, you’ll return the count variable which has the total number of elements in the list. In the below example,
Snippet list = ['a',1, True, None] def get_no_of_elements(list): count = 0 for element in list: count += 1 return count print("Number of elements in the list: ", get_no_of_elements(list))There are 4 elements in the list including the None value. Hence you’ll see output 4. Output Number of elements in the list: 4This is how you can get the number of elements in a list using for loop. Next, let us discuss the counting with condition. Below are the three solutions:Fastest is using a for loop and storing it in a Dict. Result #Solution 1 - Faster{1: 4, 2: 5, 3: 4, 4: 6, 5: 2, 234: 3, 23: 10, 12: 2, 123: 1, 31: 1, 13: 1, 42: 5, 34: 4, 423: 3} Simple for loop and storing it in dict - Duration: 12.032000000000153 #Solution 2 - FastCounter({23: 10, 4: 6, 2: 5, 42: 5, 1: 4, 3: 4, 34: 4, 234: 3, 423: 3, 5: 2, 12: 2, 123: 1, 31: 1, 13: 1}) Using collections.Counter - Duration: 15.889999999999418 #Solution 3 - Slow{1: 4, 2: 5, 3: 4, 4: 6, 5: 2, 34: 4, 423: 3, 234: 3, 42: 5, 12: 2, 13: 1, 23: 10, 123: 1, 31: 1} Using list comprehension - Duration: 33.0 (1) Count the Number of Elements in a Python List that Contains StringsTo start with a simple example, let’s create a list that contains 5 names: names_list = ['Jeff', 'Ben', 'Maria', 'Sophia', 'Rob'] print(names_list)Run the syntax above, and you’ll get the following list: ['Jeff', 'Ben', 'Maria', 'Sophia', 'Rob']You can then use the len() function in order to count the number of elements in the list: names_list = ['Jeff', 'Ben', 'Maria', 'Sophia', 'Rob'] print(len(names_list))Once you run the code in Python, you’ll get the count of 5. Let’s extend the list by additional 3 names, and then recount the number of elements: names_list = ['Jeff', 'Ben', 'Maria', 'Sophia', 'Rob'] names_list.extend(['Laura','Elizabeth','Justin']) print(len(names_list))You’ll now get the count of 8. “count number of integers in list python” Code Answer’show to find no of times a elements in list python python by Bst Barracuda on May 17 2020 Comment 8 count number items in list python python by Mardax on Aug 03 2020 Comment 3 Add a Grepper Answer Python answers related to “count number of integers in list python”
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