Python でネストされたリストを CSV ファイルにエクスポートするには?

Exporting Nested Lists to CSV Files in Python

Writing nested lists, where each inner list contains elements of different types, to CSV files can be a common task when working with data in Python. Here's how to tackle this challenge:

Python's csv module provides convenient methods for handling CSV operations. To write a list of lists such as a = [[1.2,'abc',3],[1.2,'werew',4]] to a CSV file, follow these steps:

1. Open a file for writing in newline mode.

   import csv
   
   with open('out.csv', 'w', newline='') as f:
       ...

2. Create a CSV writer object.

   writer = csv.writer(f)

3. Write the list of lists to the file using writerows().

   writer.writerows(a)

This approach will generate a CSV file with each inner list on a separate line, with elements separated by commas. The format of the data in a will be preserved in the CSV file, with float, string, and integer elements intact.

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