How to debug Web2py applications?

Question

Is it possible? By debug I mean setting breakpoints, inspect values and advance step by step.

The title says win2py, and the tag says web2py. Can you correct one of them? — Ned Batchelder, Nov 24 '08 at 20:19

tangentstorm · Accepted Answer · 2019-06-10T14:52:46.373

10

You can do remote debugging of python web apps over TCP/IP with winpdb.

(Link appears down as of June 2019. Try PyPI winpdb)

edited Jun 10 '19 at 14:52

answered Nov 25 '08 at 19:03

tangentstorm

7,183
2
29
38

Link broken ____ – Pacerier May 29 '19 at 11:32

score 8 · Answer 2 · answered Nov 24 '08 at 20:22

I haven't used web2py, but if it runs in a terminal window, you can use standard pdb stuff. Add this line somewhere in your code:

import pdb; pdb.set_trace()

This will invoke the debugger and break. Then you can use PDB commands: n to step to the next line, l to list code, s to step into a function, p to print values, etc.

Carl · Answer 3 · 2010-10-08T02:09:48.837

8

One can debug applications built on Web2py using the following set-up:

Eclipse IDE
Install Pydev into Eclipse
Set Breakpoints on your code as needed
Within Eclipse right-click the file web2py.py and select Debug As -> Python Run
When a breakpoint is hit Eclipse will jump to the breakpoint where you can inspect variables and step thru the code

edited Oct 08 '10 at 02:09

answered Apr 30 '09 at 10:04

Carl

2,896
2
32
50

score 6 · Answer 4 · answered Mar 08 '12 at 15:45

You can also use Visual Studio 2010. Here's how:

Download and install Python Tools for Visual Studio.
Create a new project from existing code (File > New > Project From Existing Code...)
Specify your web2py folder and use the defaults.
Right-click on web2py.py and choose Set as Startup File.
Set breakpoints and hit F5 (run) or right-click on web2py.py and choose Start with Debugging.

This is a nice setup if you already use visual studio.

score 1 · Answer 5 · answered Nov 10 '09 at 04:29

1

Yes, it is possible, Due to the "span prevention" I am still not allowed to post screenshots, but here is a full screenshot hosted at my website:

http://static.techfuel.net/debug_web2py.png

answered Nov 10 '09 at 04:29

Speedbird

86
4

score 1 · Answer 6 · answered Jan 26 '11 at 15:27

1

I'm debugging web2py applications with Eclipse and PyDev. Here is an article: http://www.web2pyslices.com/main/slices/take_slice/2

answered Jan 26 '11 at 15:27

jgilrincon

124
1
8

score 0 · Answer 7 · edited Jan 30 '12 at 13:31

0

As Carl stated, it is as easy as:

Installing PyDev in Eclipse
Right Click on your Web2Py project, selecting Debug As > Python Run
Selecting web2py.py as the file to run

No other plugins or downloads are needed.

edited Jan 30 '12 at 13:31

Cosmin

21,216
5
45
60

answered May 06 '10 at 14:42

mudface

15
2
5

score 0 · Answer 8 · answered Oct 29 '10 at 05:29

0

Here is an article on debugging python with pdb, which will work with web2py. http://sontek.net/debugging-python-with-pdb

answered Oct 29 '10 at 05:29

sontek

12,111
12
49
61

Craig · Answer 9 · 2018-12-01T03:01:19.120

@Ned Batchelder is almost right, but the standard way of doing it in web2py is slightly different.

Instead of `import pdb; pdb.set_trace(), you use the code:

from gluon.debug import dbg
dbg.set_trace()

When executing the web application, the application will freeze when it reaches this section of code. You then go to http://127.0.0.1:8000/admin/debug/interact (using the root URL for your application) and it will show a fully interactive, web based debugger:

See documentation.

How to debug Web2py applications?

9 Answers9