Tips for debugging Python program

Question

What are your best tips for debugging Python program?

Answer 1

Follow the documentation pn PDB here :- 

PDB

You can use the pdb module, insert pdb.set_trace() anywhere and it will function as a breakpoint.

>>> import pdb
>>> a="a string"
>>> pdb.set_trace()
--Return--
> <stdin>(1)<module>()->None
(Pdb) p a
'a string'
(Pdb)

To continue execution use c (or cont or continue).

It is possible to execute arbitrary Python expressions using pdb. 

For example, if you find a mistake, you can correct the code, then type a type expression to have the same effect in the running code.