2. languages
  3. python
  4. pdb

    Python Debug

    documentation

    Useful commands

    • a print the argument lsit of the current function
    • help

    Example

    test.py:

    def addition(a, b):
  r = a + b
  return r

def multiplication(a, b):
  breakpoint()
  r = a * b
  return r

addition(multiplication(2, 2), 1)

    go up, down, continue (until next breakpoint if present)

    lparment@laptop1426597:~/projects/singular/memorandum$ python3 test.py 
> /home/lparment/projects/singular/memorandum/test.py(7)multiplication()
-> r = a * b
(Pdb) u
> /home/lparment/projects/singular/memorandum/test.py(10)<module>()
-> addition(multiplication(2, 2), 1)
(Pdb) d
> /home/lparment/projects/singular/memorandum/test.py(7)multiplication()
-> r = a * b
(Pdb) c

    go next step

    # go next step
lparment@laptop1426597:~/projects/singular/memorandum$ python3 test.py 
> /home/lparment/projects/singular/memorandum/test.py(7)multiplication()
-> r = a * b
(Pdb) n
> /home/lparment/projects/singular/memorandum/test.py(8)multiplication()
-> return r
(Pdb) n
--Return--
> /home/lparment/projects/singular/memorandum/test.py(8)multiplication()->4
-> return r
(Pdb) n
--Call--
> /home/lparment/projects/singular/memorandum/test.py(1)addition()
-> def addition(a, b):
(Pdb) n
> /home/lparment/projects/singular/memorandum/test.py(2)addition()
-> r = a + b
(Pdb) n

    add a break

    Note: break can be a filename:linenumber or a function

    lparment@laptop1426597:~/projects/singular/memorandum$ python3 test.py 
> /home/lparment/projects/singular/memorandum/test.py(7)multiplication()
-> r = a * b
(Pdb) tbreak addition
Breakpoint 1 at /home/lparment/projects/singular/memorandum/test.py:1
(Pdb) c
Deleted breakpoint 1 at /home/lparment/projects/singular/memorandum/test.py:1
> /home/lparment/projects/singular/memorandum/test.py(2)addition()
-> r = a + b
(Pdb) a
a = 4
b = 1