{"id":12288,"date":"2020-12-02T00:23:29","date_gmt":"2020-12-02T08:23:29","guid":{"rendered":"https:\/\/careerkarma.com\/blog\/?p=12288"},"modified":"2023-12-01T04:05:09","modified_gmt":"2023-12-01T12:05:09","slug":"python-count","status":"publish","type":"post","link":"https:\/\/careerkarma.com\/blog\/python-count\/","title":{"rendered":"A Step-By-Step Guide to Python Count"},"content":{"rendered":"\n

The Python count() method calculates how many times a particular element appears in a list or a string. count() accepts one argument: the value for which you want to search in the list. The count() method is appended to the end of a list or a string object.<\/em><\/p>\n\n\n\n

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You may want to know how many times a specific value appears in the list or the string. For example, say you are a wholesaler. You may want to know how many orders a specific customer has placed over the last six months.<\/p>\n\n\n\n

The Python count()<\/em> method can be used to count the number of times a particular item appears in a list or a string. When used with a string, the count()<\/em> method counts the number of times a substring<\/em> appears in a larger string. When count()<\/em> is used with a list, the method counts the number of occurrences of a specified value in a list.<\/p>\n\n\n\n

In this article, we\u2019re going to discuss how to use the count()<\/em> method on both lists and strings.<\/p>\n\n\n\n

Python count() Function<\/h2>\n\n\n\n

The Python count() function works out how many times a value appears in a list or a string. It returns the number of times the value appears as an integer.<\/p>\n\n\n\n

Here is the syntax for the count() function:<\/p>\n\n\n\n

names = ["Lewis", "Jade", "Lewis"]\n\nprint(names.count("Lewis"))<\/pre><\/div>\n\n\n\n
Our code counts how many times “Lewis” appears in our list.<\/p>\n\n\n\n
You can see that the count() method is added after a list value in this example. count() does not accept a list as an argument. The count() method expects that you pass the value for which you want to search in a list or a string as an argument.<\/p>\n\n\n\n
Python: Count Items in List<\/h2>\n\n\n\n
For example, let\u2019s say that you are a salesperson for a local tea company. You may want to know how many times English Breakfast tea has been sold over the last month to a particular customer. This will let you assess demand of the tea.<\/p>\n\n\n\n
You could use a count()<\/em> method on a list of tea orders placed over the last month by a certain customer to assess demand. Here\u2019s an example of program that accomplishes this task:<\/p>\n\n\n\n
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tea_orders_for_customer = ['English Breakfast', 'English Breakfast', 'Oolong', 'Fruit', 'Oolong', 'English Breakfast']\n\ncount_orders = tea_orders_for_customer.count('English Breakfast')\n\nprint(count_orders)<\/pre><\/div>\n\n\n\n
On the first line, of code we declare a Python array<\/a> that stores all the orders a particular customer has placed in the last month. We use the count()<\/em> method to calculate how many times the English Breakfast tea has been ordered by the customer.<\/p>\n\n\n\n
Finally, we print out the result of our count()<\/em> method to the console. We do this using a Python print() statement<\/a>. Our code returns the total number of times the English Breakfast element in the list appears. The result is 3 in this case.<\/p>\n\n\n\n
The count()<\/em> function in Python can be used on a list of numbers. Say you are a fourth grade teacher who wants to know how many ten-year-olds are in your class. You could calculate this information using the following code:<\/p>\n\n\n\n
student_ages = [9, 9, 9, 8, 9, 10, 10, 10, 9, 10]\n\ncount_ten_year_olds = student_ages.count(10)\n\nprint(count_ten_year_olds)<\/pre><\/div>\n\n\n\n
We count the element four times in our list. The program returns: 4.<\/em><\/p>\n\n\n\n
count() Python: Using Strings<\/h2>\n\n\n\n
The count()<\/em> method can count the number of occurrences of a substring within a larger string. The Python string method count()<\/em> searches through a string. It returns a value equal to the number of times a substring<\/em> appears in the string.<\/p>\n\n\n\n
The syntax for the count()<\/em> built-in function is as follows:<\/p>\n\n\n\n
string_name.count(substring, start_pos, end_pos)<\/pre><\/div>\n\n\n\n
The string count()<\/em> method takes three parameters:<\/p>\n\n\n\n