python-3.x - Python FTP 无效参数

Question

Python 3.6.1、Windows 10 x64

我使用此脚本的目标是从 FTP 站点获取 .zip 文件，然后将其放入本地目录:

from ftplib import FTP
FTP_SERVER = 'ftp.name.com'

def main():
    ftp_conn = FTP(FTP_SERVER)

    ftp_conn.login('username','password')

    get_binary_file(ftp_conn, 'file.zip', 'C:\Temp\test.zip')

    ftp_conn.close()

def get_binary_file(ftp_client, file_name, dest=None):
    if not dest:
        dest = file_name

    ftp_cmd = 'RETR {}'.format(file_name)

    with open(dest,'wb') as dest_in:
        ftp_client.retrbinary(
            ftp_cmd,
            dest_in.write

        )


if __name__ == '__main__':
    main()

我不断收到第三个参数 (C:\Temp\test.zip) 无效的错误:

Traceback (most recent call last):
  File "C:/code/ftp_dl_binary_file1.py", line 32, in <module>
    main()
  File "C:/code/ftp_dl_binary_file1.py", line 13, in main
    get_binary_file(ftp_conn, 'file.zip', 'C:\Temp\test.zip')
  File "C:/code/ftp_dl_binary_file1.py", line 23, in get_binary_file
    with open(dest,'wb') as dest_in:
OSError: [Errno 22] Invalid argument: 'C:\\Temp\test.zip'

该论证的哪些内容是无效的？

Answer 1

\test.zip 中的 \t 被解释为选项卡 control character .

你应该这样做:

    get_binary_file(ftp_conn, 'file.zip', 'C:/Temp/test.zip')

或者:

    get_binary_file(ftp_conn, 'file.zip', 'C:\\Temp\\test.zip')