读取Python中的FTP文件内容，并将其同时用于Pandas和直接 [英] Read FTP file contents in Python and use it at the same time for Pandas and directly

问题描述

我正在尝试从内存中的FTP服务器下载文件，将其转换为数据帧，但也以字节为单位返回.代码如下:

I am trying to download a file from an FTP server in memory, transform it to a dataframe but also return it as bytes. Code as follows:

import io
import pandas as pd
from ftplib import FTP

ftp_connection.cwd(ftp_folder)
download_file = io.BytesIO()
ftp_connection.retrbinary('RETR ' + str(file_name), download_file.write)
download_file.seek(0)
file_to_process = pd.read_csv(download_file, engine='python')

在搜索Stack Overflow之后，建议只是读取io流:

After searching on Stack Overflow, the suggestion was to just read the io stream:

download_file.read()
ValueError: I/O operation on closed file.

不确定下一步要执行什么操作，而无需将文件写入某个地方并以字节为单位再次读取.

Not sure what to try next, without writing the file somewhere and reading it again as bytes.

推荐答案

read_csv可能会关闭文件".因此，在致电read_csv之前先阅读它:

read_csv probably closes the "file". So read it before you call read_csv:

download_file.seek(0)
contents = download_file.read()
download_file.seek(0)
file_to_process = pd.read_csv(download_file, engine='python')

这篇关于读取Python中的FTP文件内容，并将其同时用于Pandas和直接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！