如何将含115个邮箱的列表按每10个拆分写入多个CSV文件？

Got it, let's tackle this problem together! You want to split your my_network_emails list (with 115 emails) into chunks of 10, then write each chunk to a sequentially numbered CSV file like network_csv_01.csv, network_csv_02.csv, etc. Here's a clean, efficient way to do it:

Complete Code #

import csv

# Replace this with your actual 115-emails list
my_network_emails = ["email1@example.com", "email2@example.com", ...]  

# Iterate over the list in chunks of 10
for i in range(0, len(my_network_emails), 10):
    # Calculate file number and format as two-digit string for consistent naming
    file_number = i // 10 + 1
    filename = f"network_csv_{file_number:02d}.csv"
    
    # Grab the current chunk of up to 10 emails
    email_chunk = my_network_emails[i:i+10]
    
    # Write the chunk to the corresponding CSV file
    with open(filename, 'w', newline='') as f:
        writer = csv.writer(f)
        for email in email_chunk:
            writer.writerow([email])

Key Explanations #

• Chunking the list: The range(0, len(my_network_emails), 10) generates starting indices for each chunk (0, 10, 20, ...). The slice my_network_emails[i:i+10] grabs up to 10 emails each time—even the final chunk (which will have 5 emails for your 115-item list) is handled smoothly, since Python slicing automatically stops at the end of the list.
• Sequential filenames: Using file_number:02d in the f-string ensures the file number is always two digits (e.g., 01 instead of 1), keeping your filenames consistent and sorted correctly in file explorers.
• CSV writing best practice: Adding newline='' to the open() call prevents extra blank lines from being written in CSV files on Windows systems—this is a common gotcha that's easy to fix.

Quick Notes #

• Don't forget to import the csv module (it's part of Python's standard library, so no extra installation is needed).
• If the target CSV files already exist, this code will overwrite them. If you need to append instead, change 'w' to 'a' in the open() call—but that's probably not necessary for fresh splits.

内容的提问来源于stack exchange，提问作者rachidj