tqdm printing extra content at the start of a cycle

I'm working on a simple batch iterator that should be able to keep track of the progress when running through a full set of values. For that I'm using tqdm, but at the start of an iteration it's printing empty content.

Code:

for start_idx in trange(0, len(inputs) - batchsize + 1, batchsize):
    excerpt = slice(start_idx, start_idx + batchsize)

Outputing something like:

Epoch: 0
100%|██████████| 1562/1562 [00:02<00:00, 630.24it/s]
  0%|          | 0/1562 [00:00<?, ?it/s]Epoch: 1
 62%|██████▏   | 965/1562 [00:01<00:00, 623.74it/s]

I've had similar issues with progressbar module and I just had to swap the type of output for sys.stdout but in this module I can't find a parameter to set that. Any suggestions?

Edit1: This is happening in PyCharm terminal

Solution

The clue is that Epoch: 1 at the end of the second line.

Somewhere in your code, you're printing that out, which throws tqdm off; it would usually use a \r (carriage return) character to return to the start of the line, but you're printing a newline character, so the previous line remains.