How can I embed pdb in my program? - Python

Question

I know that pdb is an interactive system and it is very helpful. My ultimate goal is to gather all memory states after executing each command in certain function, command by command. For example, with a code snippet

 0: def foo() : 1: if True: 2: x=1 3: else: 4: x=2 5: x

then the memory state of each command is

 0: empty 1: empty 2: x = 1 3: x = 1 4: (not taken) 5: x = 1

To do this, what I'd like to do with pdb is to write a script that interact with pdb class. I know that s is a function to step forward in statements and print var(in the above case, var is x) is a function to print the value of certain variable. I can gather variables at each command. Then, I want to run a script like below:

import pdb pdb.run('foo()') while(not pdb.end()): pdb.s() pdb.print('x')

But I cannot find any way how to implement this functionality. Can anybody help me??

grundic · Accepted Answer · 2017-05-23 15:24:18Z

Try memory_profiler:

The line-by-line memory usage mode is used much in the same way of the line_profiler: first decorate the function you would like to profile with @profile and then run the script with a special script (in this case with specific arguments to the Python interpreter).

Line # Mem usage Increment Line Contents ============================================== 3 @profile 4 5.97 MB 0.00 MB def my_func(): 5 13.61 MB 7.64 MB a = [1] * (10 ** 6) 6 166.20 MB 152.59 MB b = [2] * (2 * 10 ** 7) 7 13.61 MB -152.59 MB del b 8 13.61 MB 0.00 MB return a

Or Heapy:

The aim of Heapy is to support debugging and optimization regarding memory related issues in Python programs.

Partition of a set of 132527 objects. Total size = 8301532 bytes. Index Count % Size % Cumulative % Kind (class / dict of class) 0 35144 27 2140412 26 2140412 26 str 1 38397 29 1309020 16 3449432 42 tuple 2 530 0 739856 9 4189288 50 dict (no owner)

Thank you! I think this is exactly what I want to. I will try this solution to my project. Thanks a lot!

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