debugger in ipython is not working

Question

I trying to use the debugger in ipython 3.1 on my python 2.7.9 installation on Windows 7.

Here is an example script:

def works_fine():
    a = 5
    b = 6
    assert(a + b == 11)

def throws_an_exception():
    a = 5
    b = 6
    assert(a + b == 10)

def calling_things():
    works_fine()
    throws_an_exception()

calling_things()

I step into the code with %debug.

I go up with u

Then I add a breakpoint at line 12 with b 12

I press c

Then instead of the debugger runs continue it prints out "ipdb> c" instead of continue.. How should I solve this?

> <ipython-input-7-c95b844c9880>(9)throws_an_exception()
      8     b = 6
----> 9     assert(a + b == 10)
     10 

ipdb> u
> <ipython-input-7-c95b844c9880>(13)calling_things() 2    12     works_fine()
---> 13     throws_an_exception()
     14 

ipdb> b 12 Breakpoint 3 at <ipython-input-7-c95b844c9880>:12
ipdb> c

I load it like this: on the first line inside the notebook: def works_fine(): a = 5 b = 6 assert(a + b == 11) def throws_an_exception(): a = 5 b = 6 assert(a + b == 10) def calling_things(): works_fine() throws_an_exception() calling_things() — Isak La Fleur
– Isak La Fleur, Commented May 25, 2015 at 6:41

kenorb · Accepted Answer · 2015-05-25 08:55:43Z

2

I figured it out. I need to put the code in a file and run -d xxxx.py. After this the continue works fine!

run -d ch03/ipython_bug.py

edited May 25, 2015 at 8:55

kenorb

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answered May 25, 2015 at 6:48

Isak La Fleur

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1 Comment

Thomas K Over a year ago

After an exception, %debug puts you in a post-mortem debugger - this lets you walk up and down the stack to investigate what was going on when the exception hit, but you can't continue or step through the code, because the exception has already stopped execution.

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