The “w+” tells Python that we are writing to a new file. If the file already exists, then that file is overwritten. If the file doesn’t already exist, then it will be created.

For that, I have some number of parameter combinations, each of which I run 100,000 times. I'd now like to write the result of each simulation to a CSV file.

When run it produces: $ python csv1.py A : 1 B : 2 C D : 3 4 A : 5 B : 6 C D : 7 In addition, the csv module provides writer objects for writing CSV files. The following Python program converts our ...

This is particularly true in Python, seeing as Python is such a popular option for machine learning and data science. Read on then, and we’ll explore how to read CSV files in Python!