Python的FTP無效參數

Question

的Python 3.6.1的Windows 10的x64

我此腳本的目標是從一個FTP站點搶一個.zip文件，然後把它變成一個本地目錄：

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() 

我不斷收到一個錯誤的第三個參數（C：\ TEMP \ test.zip）無效：

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' 

是什麼樣的說法無效？

Answer 1

\t in \test.zip被解釋爲標籤control character。

而應該做的：

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

或者：

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