https://docs.python.org/3.7/library/pdb.html:

"The typical usage to break into the debugger from a running program is to insert

import pdb; pdb.set_trace()

at the location you want to break into the debugger."

A plain read of this says: insert code into a running program.
I can do this just fine in gdb, so when reading this, I wonder
if attaching is explained elsewhere, or what.

Patch to improve this.