How to Read Extremely Large Text Files in Python

A three part case study ( since extended to 5 parts) in reading a big (21GB) text file using C, Python, PYSPARK, Spark-Scala and Athena/Glue.

In this post, wewill introduce a method for reading extremely large files that can be used according to project requirements.

What will you learn? Opening files; Reading files; Iteration; Iterators; Iterables; Generators; Yield. How to open a file in python?

The best thing to do is to iterate over the file directly. The file handler will act as a generator, producing lines one at a time rather than aggregating them ...

Use a for loop on a file object to read it line-by-line. Use with open(...) to let a context manager ensure that the file is closed after reading.

Python File object provides various ways to read a text file. The popular way is to use the readlines() method that returns a list of all ...

To read large text files in Python, we can use the file object as an iterator to iterate over the file and perform the required task. Since the ...

In this blog post, we'll explore strategies for reading, writing, and processing large files in Python, ensuring your applications remain responsive and ...

You can use a simple for loop to iterate through the lines of a large text file in Python: · with open('your_file.txt', 'r') as file: · for line ...

I have a large file which is a few million lines. I want to read each line and do something with it. Considerations: I don't want the whole file ...