19

Here are my actions in IPython:

> import my_module
> import ipdb

Now, my module lacks any executable code, it only declares classes. So I want to make a statement:

> g = my_module.Graph()
> f = open('test.osm')
> g.from_osm(f)

I want to put a breakpoint inside Graph.from_osm, without editing the file. I don't want to put the latter lines into the file and to do python -m ipdb .... I just want to run commands and debug.

Is this possible?

added: I see, it's possible to

%run -d script_name

or

> import pdb
> pdb.run('statement')

but it's impossible to do ipdb.run('statement'), there's no .run in ipdb!

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2
  • 1
    There is a .run in ipdb 0.8. Commented Apr 4, 2014 at 13:00
  • 1
    possible duplicate of Stepping into a function in IPython Commented Mar 5, 2015 at 17:20

2 Answers 2

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8

Since IPython 3.2.2, the %debug magic, if given an argument (a single line or a cell), executes it under debugger.

  • It breaks before executing anything, giving you a chance to set breakpoints and/or start stepping through the code.
  • And it accepts a --breakpoint argument that sets one more breakpoint (as a part of the command, it'll be saved in command history, saving you typing for repeated invocations).
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Comments

2

Perhaps the 'magic' commands %debug and / or %pdb in IPython can help you.

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3 Comments

No, it's not what I look for. They both stop at an exception. I just want to watch program execution step by step.
As of IPython 5, debug stops before executing anything, allowing you to set breakpoints and/or begin stepping through the code.
IPython 6 stops at exception

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