Ntransfercmd Of FTP Class In Python

Method Name:

ntransfercmd

Method Signature:

ntransfercmd(cmd, rest=None)

Parameters:

cmd – An FTP transfer command like STOR and RETR.

rest – A location in the file from where the transfer has to be resumed. The default value is None.

Return Value:

A tuple containing the socket and the expected size of the data.

Overview:

  • The method ntransfercmd() executes a transfer command like STOR, RETR and others.
  • Using ntransfercmd() files can be downloaded from or uploaded to an FTP server in either binary mode or text mode.
  • The file transfer can be done in either active mode or passive mode.
  • The method is similar to transfercmd() but differs in return value. It returns a tuple containing a socket and the expected size of data.

Example:

# Example Python Program to upload a file from an FTP client

# in active mode

from ftplib import FTP

 

# Instantiate an FTP object

ftpObject = FTP()

 

# Connect to the FTP server

ftpObject.connect(host="speedtest.tele2.net");

 

# Enable active mode

ftpObject.set_pasv(False);

 

# Login to the FTP server

serverResponse = ftpObject.login();

print(serverResponse);

 

# Change the working directory(if required)

ftpObject.cwd("/upload");

 

# Initiate a file upload to the server in active mode

downloadCommand = "STOR 1KB.zip";

 

# Tell the server that forthcoming file transfer is in binary mode

serverResponse = ftpObject.sendcmd('TYPE I');

print(serverResponse);

 

with open('512KB.zip', 'rb') as fd:

    with ftpObject.ntransfercmd(downloadCommand)[0] as dataConnection:

        while 1:

            buffer = fd.read(1024);

            if buffer == b'':

                break;

            dataConnection.sendall(buffer);

    print(ftpObject.voidresp());

 

Output:

230 Login successful.

200 Switching to Binary mode.

226 Transfer complete.

 


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