CODEWITHSUNDEEP
pythonstack-tracetraceback
Adam
Adam

Reputation: 2334

How to get value of arguments passed to functions on the stack?

Using:

traceback.print_stack()

I can get:

  File "x.py", line 20, in <module>
    y(x)
  File "x.py", line 11, in y
    fun(x)
  File "x.py", line 8, in fun
    traceback.print_stack()

I there any way to get something like this:

  File "x.py", line 20, in <module>
    y(x) WHERE x == 1
  File "x.py", line 11, in y
    fun(x) WHERE x == 'str'
  File "x.py", line 8, in fun
    traceback.print_stack()

I just want to see what arguments was passed to functions.

Upvotes: 14

Views: 6803

Answers (2)

Tim Lesher
Tim Lesher

Reputation: 6441

You can use the inspect module for this:

>>> import inspect
... def fn(x):
...     try:
...         print(1/0)
...     except ZeroDivisionError as e:
...         frames = inspect.trace()
...         argvalues = inspect.getargvalues(frames[0][0])
...         print("Argvalues: ", inspect.formatargvalues(*argvalues))
>>> fn(12)
Argvalues:  (x=12)

Upvotes: 10

Sven Marnach
Sven Marnach

Reputation: 601559

You can probably rig something up by using inspect.getargvalues() and accessing the stack frame belonging to your traceback:

 inspect.getargvalues(traceback.tb_frame)

You'll have to do some work to get the output exactly as desired. The above line is only for the innermost frame, so you'll have to walk up the stack and access the information you need for every frame. inspect.getouterframes() might come in handy.

Upvotes: 14

Related Questions