Using The Zope Debugger

Created by . Last modified on 2003/08/01.

(created from Jim Fulton's presentation given at the 9th International Python Conference).

The Debugger is your Friend

Sets up a request environment

Simple tests

Debugging

Timing

Profiling

Simple testing

You can do simple tests:

     cd lib/python

     python

     import Zope

     Zope.debug('/manage_addFolder?id=foo', u='jim:123') 

You can use this mode with external debuggers like Wing and Komodo.

Debugging with pdb

Same as before, but add the d argument:

     python

     import Zope

     Zope.debug('/manage_addFolder?id=foo', u='jim:123', d=1) 

Breakpoints are preset to allow you to continue to predefined points of interest.

Entry to publishing (just above) entry to application code

Post-mortem debugging

Use the pm option:

     import Zope

     Zope.debug('/manage_addFolder?id=foo', u='jim:123', pm=1) 

If there's an error, use pdb.pm:

     import pdb

     pdb.pm() 

Time execution

Use t option:

     python

     import Zope

     Zope.debug('/manage_main, u='jim:123', t=1) 

Executes once, to warm up, and then runs 100 times, computing average time.

Includes publisher overhead.

Can modify repeat count lamely:

     import ZPublihser.Test

     ZPublisher.Test.repeat_count=10 

Using the Python profiler

Supply the name of a statistics file via the p option:

     import Zope

     Zope.debug('/manage_addFolder?id=foo',u='jim:123', p='prof.dat')

     import pstats

     s=pstats.Stats('prof.dat')

     s.print_stats() 

Setting request variables

You can provide extra request variables via the extra argument:

     Zope.debug('/manage_addFile?id=foo', u='jim:123',d=1, extra={'file': open('test.dat')} )

The .bobodb file

Read when the d option is used.

Used to set breakpoints or set up "environment" data:

     import OFS.Folder
     breakpoints=(OFS.Folder.manage_addFolder, ) env={'rows': '20'}