[PYTHON] Easy debugging with ipdb

My name is Kazuhiro Minomaki (https://qiita.com/mimaki_kazuhiro) and I am an intern at Future Electronic Technology. This time I will write about ipdb.

Since you are a beginner in programming, the content may be incorrect. If there are any mistakes, I will correct them so please point out more and more.

What is ipdb

It provides extensions to pdb, the standard debugger for Python. Debugging is the process of finding and correcting mistakes in a program. Then, install it first.

terminal

$ sudo pip install ipdb

Let's actually operate

Create a file with an appropriate name. This time I created a file called test.py.

test.py

import ipdb
print ("debug program")
a = 10 / 3
b = 10.3 / 3.4
ipdb.set_trace()
print (a,b)

Execute with the following command.

terminal

python3 -m ipdb test.py #file name

Then, on the screen below.

terminal

> /Users/mimakikazuhiro/Desktop/djangosw/test.py(1)<module>()
----> 1 import ipdb
      2 print ("debug program")
      3 a = 10 / 3

ipdb>

For the time being, press "h" to ask "what kind of function does it have?"

terminal

ipdb> h                                                                         

Documented commands (type help <topic>):
========================================
EOF    cl         disable  interact  next    psource  rv         unt   
a      clear      display  j         p       q        s          until 
alias  commands   down     jump      pdef    quit     source     up    
args   condition  enable   l         pdoc    r        step       w     
b      cont       exit     list      pfile   restart  tbreak     whatis
break  continue   h        ll        pinfo   return   u          where 
bt     d          help     longlist  pinfo2  retval   unalias  
c      debug      ignore   n         pp      run      undisplay

Miscellaneous help topics:
==========================
exec  pdb

ipdb>

I'll push it in various ways.

terminal

ipdb> n                                                                        
> /Users/mimakikazuhiro/Desktop/djangosw/test.py(2)<module>()
      1 import ipdb
----> 2 print ("debug program")
      3 a = 10 / 3

terminal

ipdb> s                                                                        
debug program
> /Users/mimakikazuhiro/Desktop/djangosw/test.py(3)<module>()
      2 print ("debug program")
----> 3 a = 10 / 3
      4 b = 10.3 / 3.4

terminal

ipdb> q

End with "q". It seems that you can easily debug like this.