Exporting a Python List of Lists to a CSV File

Your objective is to convert a Python list of lists into a CSV file, ensuring that data of varying types (float, int, string) is preserved in each sublist. The desired CSV format involves separating elements within each sublist using commas and aligning the sublists vertically.

To achieve this, you can leverage Python's built-in csv module:

import csv

with open('out.csv', 'w', newline='') as f:
    writer = csv.writer(f)
    writer.writerows(a)

Here, it is assumed that 'a' represents your list of lists. By specifying 'newline='' when opening the file, you prevent the automatic insertion of newlines at the end of each row. The 'csv.writer()' function creates a new writer object for the specified file. Using the 'writerows()' method, we iterate through each sublist in 'a' and write it to the CSV file, separating elements by commas.

This approach offers flexibility in customizing the output format by providing optional parameters to 'csv.writer()'. For instance, you can define a delimiter (e.g., ';') to separate elements or specify the quoting style for string values.