Adding breakpoints programmatically using pdb in python

Question

I find that in large multi-tier pieces of software it is typically easier to debug python code by putting the following within the code.

import pdb; pdb.set_trace() this sets a breakpoint at the LOC where I put the statement, and I can continue within the code using pdb in an interactive way and inspect the code execution etc.

I would like to know if its possible to add more than one breakpoints for such python debugging such that I can do c in the interactive python debugger and hit the next breakpoint?

i.e. for instance

<python code>
import pdb; pdb.set_trace();
... interactive debugging....
...press c here....
<more python code>
...
....
<breakpoint>// How can we insert such a breakpoint?

Andy · Accepted Answer · 2019-02-06 23:44:21Z

I once did this for ipdb by heavily modifying it here. However, I recently reinvented the wheel, in a way I think is simpler will work with any Bdb debugger. Tested on pdb and and ipdb

#!/usr/bin/env python3

import pdb
import sys
import ipdb.__main__

def foo(x):
  return x+1

class RunningTrace():
  def set_running_trace(self):
    frame = sys._getframe().f_back
    self.botframe = None
    self.setup(frame, None)
    while frame:
      frame.f_trace = self.trace_dispatch
      self.botframe = frame
      frame = frame.f_back
    self.set_continue()
    self.quitting = False
    sys.settrace(self.trace_dispatch)

class ProgrammaticPdb(pdb.Pdb, RunningTrace):
  pass

class ProgrammaticIpdb(ipdb.__main__.debugger_cls, RunningTrace):
  pass

p = ProgrammaticPdb()
# p = ProgrammaticIpdb(ipdb.__main__.def_colors)

p.onecmd('b bar.py:38') # Works before set_running_trace
p.set_running_trace()
p.onecmd('b foo')       # only works after calling set_running_trace
p.onecmd('l')

x=-1
x=2
x=0
x=foo(x)

print(x)

You can set breakpoints by file/line number before calling set_running_trace, however you can only set breakpoints that depend on scope after calling set_running_trace, such as the function name foo in this example.

eEmanuel Oviedo · Accepted Answer · 2022-06-06 20:30:17Z

0

Following the @andy way, in more recent ipdb versions you can use:

debugger_cls = ipdb.__main__._get_debugger_cls()

answered Jun 6, 2022 at 20:30

eEmanuel Oviedo

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