update log

2022-09-30: change order of read and write section; other small fixes.

In this post, I will share the most convenient way to read and write CSV files (with or w/o headers) in Python.

Read CSV files

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Use the builtin CSV module

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Python has a built-in CSV module that deals with CSV files. CSV module provides a CSV reader, which we can use to read CSV files. The CSV reader is an iterable object. We can use the following snippet to read CSV files: