Running ipython in the terminal if I copy and paste this block of code:

    # Comment
    x = 1

with the leading indentation on both lines, in 8.33.0 it works fine. IPython recognizes the code has consistent leading whitespace, presumably dedents it under the hood, and executes it.

In [1]:     # Comment
   ...:     x = 1

In [2]: 

However, in 9.0.1

In [1]:     # Comment
   ...:     x = 1
   ...: 
  Cell In[1], line 2
    x = 1
    ^
IndentationError: unexpected indent

I'm not sure if this was intentional or not, but this is a major usability issue for me. My entire workflow is based around copy/pasting chunks of code. I've been working this way for 15 years. I've written libraries around it. There is a PR awaiting merge in CPython to add this dedent feature to "python -c".

If this is intentional, I beg the maintainers to reconsider. Otherwise, this is a major bug.

Tested on Ubuntu 24.04 on CPython 3.13.2 and 3.11.2