Collections | Counter | More Simple Python Tutorials | 2021
This python tutorial for beginners explains how to use the counter module from collections in python. The video shows how to create a counter to count the amount of characters in a python list, tuple and string. The counter module is one of several modules available from collections and this video is the first in which we focus solely on the counter module and its available methods.
In python we can create a counter object using the counter module and this counts the elements in the string, list or tuple. The first method that is explained in the most common method that takes as an argument the amount of most common elements, so for example, the user can enter 3 and this module would provide the top 3 most common elements. Some users may prefer to use a python dictionary and it is quite simple to convert the counter object to a dictionary.
The update method is self-explanatory, it can be used to add elements or even to add a second counter to the first. In an example in the video the update method adds the counts from a secondary counter to the original counter. This produces the same result as adding the two counters in the arithmetic operation to add. Other arithmetic operations that can be performed on the counter object are subtraction, intersection and union.
There is an example of how to use the counter elements option. This provides an iterable object such that the user can loop over each element. In the video you can see the use of the set operation with elements to provide each element and its count. Finally, there is an example from the web that uses a counter of characters from a file, update and most common. This provides, as you would suspect, the most common characters in the file.
0:00 video start
0:31 counter
2:05 most common
3:23 elements
4:40 counter to dictionary
5:03 update
6:07 arithmetic operations
7:28 counting file content
8:43 practice exercises
9:37 practice solutions
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