Writing a dataframe to a pickle file instead of a CSV file can be very helpful particularly if you want to preserve the state of the dataframe.

Is pickle better than CSV?

Pickle: Pickle is the native format of python that is popular for object serialization. The advantage of pickle is that it allows the python code to implement any type of enhancements. It is much faster when compared to CSV files and reduces the file size to almost half of CSV files using its compression techniques.

What is pickle file in pandas?

Python objects can be saved (or serialized) as pickle files for later use and since pandas dataframes are also python objects, you save them as pickle files. Generally, we use data stored in csv, excel, or text files to read as dataframes.