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more detailed python backtraces (similar to backtrace module)

Project Description
utilities for debugging of python scripts. prints stack backtraces that look similar to gdb stacktrace (gdb commands bt and bt full);
can be used instead of traceback.

Written by Michael Moser (c) 2015

Functions

die(*msg)
receives a variable number of arguments; prints each argument (with pprint) to standard error stream,
shows a detailed stack trace (also to standard error, see print_stack_ex, does not follow objects (follow_objects = 0);
exit program with error (status 1)
this is similar to die built in function in perl

die2(*msg)
receives a variable number of arguments; prints each argument (with pprint) to standard error stream,
shows a detailed stack trace (also to standard error, see print_stack_ex, does follow objects (follow_objects = 1);
exit program with error (status 1)
this is similar to die built in function in perl

print_exception_ex(follow_objects=0, file=None)
prints an exception with more detailed stack trace, is used as follows:
the function is similar to traceback.print_exception , just with more detailed stack trace

import pd

try:
<python code>
except BaseException:
pd.print_exception_ex()


parameters:

follow_objects - if not 0 then representation of object values is printed
Please note that follow_objects=1 can generate a lot of output, and can take a lot of time. (default 0)

file - print to file (default value None - print to standard error stream)

example stack trace:

Exception: got it

#1 def kuku2(self = {'a': 42, 'b': [1, 2, 3, 4]}, depth = 1) at test_pd.py:29
Calls next frame at:
raise Exception('got it') at: test_pd.py:29

#2 def kuku2(self = {'a': 42, 'b': [1, 2, 3, 4]}, depth = 2) at test_pd.py:28
Calls next frame at:
kuku2( depth - 1 ) at: test_pd.py:28

#3 def kuku2(self = {'a': 42, 'b': [1, 2, 3, 4]}, depth = 3) at test_pd.py:28
Calls next frame at:
kuku2( depth - 1 ) at: test_pd.py:28

#4 def kuku2(self = {'a': 42, 'b': [1, 2, 3, 4]}, depth = 4) at test_pd.py:28
Calls next frame at:
kuku2( depth - 1 ) at: test_pd.py:28

#5 def kuku2(self = {'a': 42, 'b': [1, 2, 3, 4]}, depth = 5) at test_pd.py:28
Calls next frame at:
kuku2( depth - 1 ) at: test_pd.py:28

#6 def kuku2(self = {'a': 42, 'b': [1, 2, 3, 4]}, depth = 6) at test_pd.py:28
Calls next frame at:
kuku2( depth - 1 ) at: test_pd.py:28

#7 def main() at test_pd.py:44
Local variables:
n = {'a': 42, 'b': [1, 2, 3, 4]}
Calls next frame at:
pd.print_exception_ex( follow_objects = 1 ) at: test_pd.py:44


print_stack_ex(skipframes=0, follow_objects=0, file=None, frame=None)
print stack trace from an arbitrary point in the program;
the function is similar to traceback.print_stack , just with more detailed stack trace

the stack trace includes function names, values of parameters and values of local variables. i find it easier to debug with this stack trace.

parameters:
skipframes - skip a number of frames if is not 0 (default 0)

follow_objects - if not 0 then representation of object values is printed
Please note that follow_objects=1 can generate a lot of output, and can take a lot of time. (default 0)

file - print to file (default value None - print to standard error stream)

frame - specify a start frame (default None - show from calling function; deepest frame on top marked with #1)

this function is similar to traceback.print_stack , just with more detailed stack trace.

works for python 2.7, should work for other versions as well

example stack trace:

#1 def fact(n = 1) at test_pd.py:10
Local variables:
loc 2
loc2 [0]
Calls next frame at:
pd.print_stack_ex() at: test_pd.py:10

#2 def fact(n = 2) at test_pd.py:8
Local variables:
loc 4
loc2 [0, 1]
Calls next frame at:
return n * fact( n - 1 ) at: test_pd.py:8

#3 def fact(n = 3) at test_pd.py:8
Local variables:
loc 6
loc2 [0, 1, 2]
Calls next frame at:
return n * fact( n - 1 ) at: test_pd.py:8

#4 def fact(n = 4) at test_pd.py:8
Local variables:
loc 8
loc2 [0, 1, 2, 3]
Calls next frame at:
return n * fact( n - 1 ) at: test_pd.py:8

#5 def main() at test_pd.py:36
Local variables:
Calls next frame at:
print fact(4) at: test_pd.py:36

#6 def <module>() at test_pd.py:53
Calls next frame at:
main() at: test_pd.py:53
Release History

Release History

This version
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0.0.1

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