Well, here is a sort of slow approach. It can be modified for watching for local variable change (just by name). Here is how it works: we do sys.settrace and analyse the value of obj.attr each step. The tricky part is that we receive ‘line’ events (that some line was executed) before line is executed. … Read more
I think what you are looking for is nose. It works like a test runner for unittest. You can drop into the debugger on errors, with the following command: nosetests –pdb
data breakpoints with pdb …much like you can watch a memory address in gdb… GDB uses data breakpoints, this is made easy with hardware support (hardware watchpoints), this typically involves marking the memory pages read-only which then trips an exception handler on memory access. When hardware watchpoints are not available it uses software watchpoints, these … Read more
What about ipdb.set_trace() ? In your code : import ipdb; ipdb.set_trace() update: now in Python 3.7, we can write breakpoint(). It works the same, but it also obeys to the PYTHONBREAKPOINT environment variable. This feature comes from this PEP. This allows for full inspection of your code, and you have access to commands such as … Read more
At this time, pdb does not have the ability to halt and begin debugging on a running program. You have a few other options: GDB You can use GDB to debug at the C level. This is a bit more abstract because you’re poking around Python’s C source code rather than your actual Python script, … Read more
You can run your program into pdb from the command line by running python -m pdb your_script.py It will break on the 1st line, then you’ll be able to add a breakpoint wherever you want in your code using the break command, its syntax is: b(reak) [[filename:]lineno | function[, condition]] It is flexible enough to … Read more
Five years after you wrote this, IPython still works this way, so I guess a solution might be useful to people googling this. IPython replaces sys.excepthook every time you execute a line of code, so your overriding of sys.excepthook has no effect. Furthermore, IPython doesn’t even call sys.excepthook, it catches all exceptions and handles them … Read more
You can use ipdb inside jupyter with: from IPython.core.debugger import Tracer; Tracer()() Edit: the functions above are deprecated since IPython 5.1. This is the new approach: from IPython.core.debugger import set_trace Add set_trace() where you need a breakpoint. Type help for ipdb commands when the input field appears.
Here’s a list of resources to get started with the Python debugger: Read Steve Ferb’s article “Debugging in Python” Watch Eric Holscher’s screencast “Using pdb, the Python Debugger” Read the Python documentation for pdb — The Python Debugger Read Chapter 9—When You Don’t Even Know What to Log: Using Debuggers—of Karen Tracey’s Django 1.1 Testing … Read more