Show FTP download progress in Python (ProgressBar)

Question

I am downloading files over FTP using the following Python script. What I wanted is to see the details of the progress while downloading. For that I used ProgressBar

Answer 1

You never update the ProgressBar. What you need to do is to:

• Implement a function (or a class method) that you will pass to FTP.retrbinary as callback instead of file.write. The function should do file.write and also update the progress bar.

• You also need to know size of the file/transfer for maxval argument of ProgressBar. For that you can use FTP.size.

A trivial implementation is like:

local_path = "archive.zip"
remote_path = "/remote/path/archive.zip"

file = open(local_path, 'wb')

size = ftp.size(remote_path)

pbar = ProgressBar(widgets=widgets, maxval=size)
pbar.start()

def file_write(data):
   file.write(data) 
   global pbar
   pbar += len(data)

ftp.retrbinary("RETR " + remote_path, file_write)

And now you get the progress bar you want:

Downloading:  72% [###############################            ] ETA:   0:00:00 242.1 MiB/s

---

Note for others: The OP code uses progressbar2 library.

PyQt implementation: Update PyQt progress from another thread running FTP download.