python - inspect.getargvalues() throws exception "AttributeError: 'tuple' object has no attribute 'f_code'" -

i'm trying use python's inspect module (in python 2) show information function called current function, including arguments.

here's simple test program:

import inspect  def caller_args():     frame = inspect.currentframe()     outer_frames = inspect.getouterframes(frame)     caller_frame = outer_frames[1]     return inspect.getargvalues(caller_frame)  def fun_a(arg1):     print caller_args()  def fun_b():     fun_a('foo')  if __name__ == '__main__':     fun_b() 

and happens when run it:

$ python getargvalues_test.py traceback (most recent call last):   file "getargvalues_test.py", line 16, in <module>     fun_b()   file "getargvalues_test.py", line 13, in fun_b     fun_a('foo')   file "getargvalues_test.py", line 10, in fun_a     print caller_args()   file "getargvalues_test.py", line 7, in caller_args     return inspect.getargvalues(caller_frame)   file "/system/library/frameworks/python.framework/versions/2.7/lib/python2.7/inspect.py", line 829, in getargvalues     args, varargs, varkw = getargs(frame.f_code) attributeerror: 'tuple' object has no attribute 'f_code' 

i've googled attributeerror exception, no luck. doing wrong?

(i've since found problem, i'm asking-and-answering here has problem in future find answer here.)

this similar question helped me discover problem.

the python documentation inspect module mentions both "frame records" , "frame objects", , explains difference.

• inspect.currentframe() returns frame object, but
• inspect.getouterframes() returns list of frame records.

the mistake in code above not extracting frame object frame record of calling function, , passing inspect.getouterframes() frame record instead of frame object. (note inspect.getouterframes() doesn't check argument frame object.)

here's fixed definition of caller_args() (with change assignment caller_frame):

def caller_args():     frame = inspect.currentframe()     outer_frames = inspect.getouterframes(frame)     caller_frame = outer_frames[1][0]     return inspect.getargvalues(caller_frame) 

which runs desired:

$ python getargvalues_test_fixed.py arginfo(args=['arg1'], varargs=none, keywords=none, locals={'arg1': 'foo'})