krt 0.2.3

Simple, small, interactive, console-based debugger.

Simple, small, interactive, console-based Python debugger.

• Cross-platform

• Django compatibile

KRT inherits from basic python debugger (called bdb). The main reason behind development of package was need of user interface during python script debugging in console (or when graphical interface is not available). Although pdb have the same (and propbably much more) functionality, I found it not so “user friendly”.

Installation

Install using pip.

pip install krt

Basic script debugging

python krt.py script.py
# or
python -m krt script.py

Initializing debugger during program execution

This method of initialization allows initialization at specific line.

import krt

def func(_something, _nothing):
  local_var = [1, 2, 3, 4]
  # now, initialize krt
  krt.trace()
  anything = _somethins + _nothing
  return anything

Initializing krt via decorator. This method will initialize krt at 1st line of decorated method or function.

import krt

# initialize krt
@krt.debug()
def func(_something, _nothing):
  local_var = [1, 2, 3, 4]
  anything = _somethins + _nothing
  return anything

Django usage

One can use methods mentioned above, but method below allows krt triggering only if run with pre-defined django command.

Setting up django command

1. Inside django applicaiton directory, create directory called management, inside which create directory commands. Following path, must exists django_project/application/management/commands/.

2. Create __init__.py inside management and commands directories.

3. Inside directory commands, create file <command>.py, where <command> will be used with manage.py. Let’s say that we’ve used krt_runserver.py.

4. Insert into created file: ```python from django.core.management.base import BaseCommand from django.core.management.commands import runserver

class Command(runserver.Command):
   help = “Sets trigger for krt decorators”

   def __init__(self, *args, **kwargs):
       from django.conf import settings
       setattr(settings, 'krt_django_decorator_trigger_flag', True)
       super(Command, self).__init__(*args, **kwargs)

Use decorator inside view

Decorator, when used in django project, requires setting of keyword argument django to True. If the django argument is omitted, the debugger will be always initialized!

from django.http import HttpResponse
from  krttest.krt import debug

@debug(django=True)
def index(request):
    return HttpResponse("I'm ok.")

Now, when the django server is run with created command, KRT debugger is being initialized on 1st line of view, otherwise the decorators are being ignored.

python ./manage.py krt_runserver