Bug report

Bug description:

Using specific values as variable names in breakpoints leads to incorrect behaviour.
This seems to be because certain chars are used as aliases in pdb, i.e c is continue, p is print etc.
It is triggered when the following char is non-alpha-numeric, afaict.

MRE:

Python 3.9.5 (default, Sep 14 2021, 12:04:19) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> breakpoint()
--Return--
> <stdin>(1)<module>()->None
(Pdb) c = None
>>> c
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'c' is not defined
>>> 
# I expect to still be in a breakpoint here, and for `c` to be `None`,  but pdb has 'continued' execution instead.

The same is true for other aliases, like q and p, which raise errors relating to their respective functions. (I have not tried all aliases).

CPython versions tested on:

3.9

Operating systems tested on:

Linux