add progress bar post

_posts/2023-06-22-tqdm_and_printing_in_notebooks.md

@@ -0,0 +1,30 @@
+---
+title: Progress bars and log output in Jupyter notebooks
+excerpt: 
+layout: post
+image: /assets/blog/progress_bars/bar.png
+alt: An image of a nice animated progress bar in a jupyter notebook output cell.
+---
+I wanted to have just one updateable line of output that would play nicely with a tqdm progress bar. After playing around with `print(s, end="\r")` I settled on using `Ipython.display` with a handle. The problem with the print approach is that it doesn't work when the output is shorter than the previous line.
+
+```python
+import time
+import random
+from tqdm.auto import tqdm
+from IPython.display import display, Markdown
+
+info_line = display(Markdown(''), display_id=True)
+
+for x in tqdm(range(0,5), position = 0):  
+    for y in tqdm(range(0,5), position = 1, leave=False):  
+        x = random.randint(1, 10)
+        b = "Loading" + "." * x
+        info_line.update(Markdown(b))
+        time.sleep(0.5)
+```
+<figure>
+<img src="/assets/blog/progress_bars/bar.png"/>
+<figcaption>
+What it looks like in the end.
+</figcaption>
+</figure>