How to write to a file in Python – .txt files The simplest way to write to a file in Python is to create a new text file. This will allow you to store any string to retrieve later.

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Create a list of file names. This requires you to enter the file names manually.>>>filenames = ['file1.txt', 'file2.txt', 'file3.txt'] Create a variable to store the file contents. This variable ...

Remember that a CSV file is actually just a text document with a fancy formatting. That means that you actually don’t need to use a module if you want to know how to open CSV files in Python!

The problem I've noticed is that if I append the file with each of the 100k runs (one at a time), it can happen that two threads try to save to the file at the same time and some row (s) end up empty.