Is there a keyword that's equivalent to breakpoint for debugging?

[Larz60+]

if you are using IDE lie PyCharm, do you really need this pdb library

check out this image:
   
Just click in the left margin to set breakpoint.
lower right window are watches, you can type variable names here, or even code, and it will show their values as you step through the program

The blue arrows are for (in order:
step to next line (single step)
step to next line executed
step to next line executed (but ignore libraries)
step into routine (subroutine for example)using any filters setup
step to first line executed after returning from method
run to line where cursor is located.

It works very well, and I use it all the time.

A trick I use in iterators is to set a counter to zero before entering the loop,
incrementing at the end of each iteration, and then placing some code like:

if counter == 21:
    print('breakpoint here')

and setting the breakpoing to the print statement
you can do the same using the value of a programming variable like account number for example.