comments = [] with open('comments.txt', mode='r', encoding='utf-8') as f: rows = f.readlines() for row in rows: comment = row.split(',')[3] if comment != '': comments.append(comment)

这段代码的作用是从一个文件中读取评论，并将每条评论添加到列表comments中。文件名为'comments.txt'，以只读模式打开，使用UTF-8编码。在每一行中，用逗号分隔，获取第四个元素，也就是评论内容。如果这个评论内容不为空，就将它添加到comments列表中。最终，comments列表中包含了所有非空评论。

相关问题

with open('data.csv', 'w', encoding='utf-8', newline='') as f: writer = csv.writer(f) writer.writerows(rows)

This code snippet opens a file named "data.csv" in write mode with UTF-8 encoding and no newlines. It then creates a CSV writer object and writes the list of rows to the file using the writerows() method. Each row in the list is written as a separate line in the CSV file, with each value separated by a comma. This code is useful for saving data in a CSV format that can be easily read by spreadsheet applications or other programs.

解释这段代码with open('data.csv', 'w', encoding='utf-8', newline='') as f: writer = csv.writer(f) writer.writerows(rows)

这段代码使用Python的CSV模块，将一个二维数组（rows）写入到一个名为"data.csv"的CSV文件中。

- "with open('data.csv', 'w', encoding='utf-8', newline='') as f:" ：打开名为"data.csv"的文件，并用utf-8编码格式写入，同时设置换行符为空。
- "writer = csv.writer(f)" ：创建一个CSV写入器，将其与文件对象对应。
- "writer.writerows(rows)" ：将二维数组rows写入到CSV文件中。其中，writerows()方法用于多行写入，而writerow()方法用于单行写入。