How do I debug using pdb ?

Question

instead of print debug

Answer 1

just write this line before code to debug :
import pdb ; pdb.set_trace()
and run your program.The execution of the program will then freeze, and in console you will have access to a special shell :
(pdb)
then press on 'h' to get more help.

Answer 2

adel thanks
What is difference between step and next command ?　on (pdb）shell

Answer 3

(n)ext allow you to run the next line even if the line contain a function call, (s)tep in the other hand jump inside that function to debug its content