How to Convert a List of Lists to a CSV File in Python

Published: 29 April 2020
on channel: Finxter

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There are four simple ways to convert a list of lists to a CSV file in Python.

- CSV: Import the csv module in Python, create a csv writer object, and write the list of lists to the file in using the writerows() method on the writer object.
- Pandas: Import the pandas library, create a Pandas DataFrame, and write the DataFrame to a file using the DataFrame method DataFrame.to_csv('file.csv').
- NumPy: Import the NumPy library, create a NumPy array, and write the output to a CSV file using the numpy.savetxt('file.csv', array, delimiter=',') method.
- Python: Use a pure Python implementation that doesn’t require any library by using the Python file I/O functionality.

My preference is method 2 (Pandas) because it’s simplest to use and most robust for different input types (numerical or textual).

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