Debugging in Python

Reading Time : ~ .

When something goes wrong with your code instead of using standard debugging techniques such as print statements use debugging tools. I found two great tools for debugging.

  1. using the code module.
  2. pdb module.

1.using code module: This is very useful if your code working with out errors but dint give expected result.The code module has a function interact() which stops the program execution and opens a interactive python console that inherits the local scope of the line where the interact() method is called. In that console you can print variable values(instead of placing print statements in your code),examine the state of your code and fix the bug. Place the following line in your code where you want console to start.

import code
code.interact(local=locals())

To exit the interactive console and continue with execution use Ctrl+D or Ctrl+Z or exit(). Lets have a look at following example.

#file: inc.py

def testing():
    print 'before interact'
    a=10
    b=20
    c=a+b
    import code; code.interact(local=locals())
    print 'after interact'

testing()

The output is shown below:

ramya@ramya-ws:~/Desktop$ python inc.py
before interact
Python 2.7.4 (default, Sep 26 2013, 03:20:26)
[GCC 4.7.3] on linux2
Type 'help', 'copyright', 'credits' or 'license' for more information.
(InteractiveConsole)
>>> print c
30
>>> print a
10
>>> print b
20
>>>
after interact
ramya@ramya-ws:~/Desktop$
    By Posted On
SENIOR DEVELOPER at MICROPYRAMID

Need any Help in your Project?Let's Talk

Latest Comments
Related Articles
Understanding self and __init__ method in python Class. Anjaneyulu Batta

Understand self and __init__ method in python Class?
Before understanding the "self" and "__init__" methods in python class, it's very helpful if we have the ...

Continue Reading...
Python Web Scraping with Beautiful soup Sandeep Jagata

Download all One Piece animation series episodes by scraping site using BeautifulSoup python library.

Continue Reading...
Understanding Python Properties Ramya Ambati

Python Properties is a class for managing class attributes in Python. Property( ) is a built-in function that creates and returns a property object

Syntax:
Continue Reading...

Subscribe To our news letter

Subscribe to our news letter to receive latest blog posts into your inbox. Please fill your email address in the below form.
*We don't provide your email contact details to any third parties