title: how to print double loop output in one line using tqdm
body: <p>I want to print double loop output in one line using tqdm</p>
  <p>I Try:</p>
  <pre><code>from tqdm import tqdm
  
  epochs = 3
  num_batch=5
  for epoch_step in range(epochs):
      with tqdm(range(num_batch)) as pbar:
          for batch_step in pbar:
              pbar.set_description(f&quot;Epochs {epoch_step+1}/{epochs}&quot;)
              pbar.set_postfix({'batch loss': 'This is batch loss' })
          pbar.set_postfix({'epoch loss': 'This is epoch loss'})           
  </code></pre>
  <p>and Expecting output:</p>
  <pre><code>Epochs 1/3: 100%|██████████| 5/5 [00:00&lt;00:00, 890.13it/s, batch loss=This is epoch loss]
  Epochs 2/3: 100%|██████████| 5/5 [00:00&lt;00:00, 677.24it/s, batch loss=This is epoch loss]
  Epochs 3/3: 100%|██████████| 5/5 [00:00&lt;00:00, 969.78it/s, batch loss=This is epoch loss]
  </code></pre>
  <p>But this are real output:</p>
  <pre><code>Epochs 1/3: 100%|██████████| 5/5 [00:00&lt;00:00, 890.13it/s, batch loss=This is batch loss]
  Epochs 2/3: 100%|██████████| 5/5 [00:00&lt;00:00, 677.24it/s, batch loss=This is batch loss]
  Epochs 3/3: 100%|██████████| 5/5 [00:00&lt;00:00, 969.78it/s, batch loss=This is batch loss]
  </code></pre>
  <p>How I try to fix my code to get expected output?</p>