The Top 10 File Handling Techniques in Python
8. Read Files

One of the most important file operations we do is certainly reading the data from the files. After all, the content within the file is probably the only reason that the file was created in the first place. To read a file, the most conventional way is to create a file object using the built-in open() function. By default, the function will open the file in the read mode and treat the data in the file as texts. Let’s see an example.

Read File

The above code shows you the most common ways to read the content of a file. If you know that your file doesn’t have too much data, you can simply read it all at once with the read() method. However, when the file is enormously large, you should consider using a generator that allows you to process the data row by row. Specifically, the file object works as a generator by rendering the data row by row, which saves memory by eliminating the need of loading all the data when we use the read() method. If you want to learn more about generators, you can refer to this article, which covers the use of generators in file reading.
['Yong Cui']
['Artificial Intelligence', 'Programming', 'Python', 'Technology', 'Data Science']