We can use debugging tools to minimize and find bugs. In this article you will learn the best Python debugging tricks.
PuDB – A console-based Python debugger
A graphical interface is shown using the PuDB terminal.
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to install with Python 3:
sudo pip3 install pudb
for Python 2.x use:
sudo pip install pudb
Start debugging with:
$ pudb3 program.py
(or sudo if you don’t have the right permissions)
You can take step by step through the program. Use the n key to take a step through the program. The current variable contents are shown on the right top.
You can set breakpoints using the b key. To continue execution until the next breakpoints, press the c key.
PDB – The Python Debugger
The module pdb supports setting breakpoints. A breakpoint is an intentional pause of the program. where you can get more information about the programs state.
To set a breakpoint, insert the line
A practical example:
import pdb x = 3 y = 4 pdb.set_trace() total = x + y pdb.set_trace()
We have inserted a few breakpoints in this program. The program will pause at each breakpoint (pdb.set_trace()). To view a variables contents simply type the variable name:
$ python3 program.py (Pdb) x 3 (Pdb) y 4 (Pdb) total *** NameError: name 'total' is not defined (Pdb)
Press c or continue to go on with the programs execution until the next breakpoint
(Pdb) c --Return-- > program.py(7)<module>()->None -> total = x + y (Pdb) total 7