Trace every steps in Python Script

I am new to Python scripting and i have one big script for an automation. I am trying to understand how that script is tracing the supplied data. i am not able to trace each and every steps how the flow and what will be value at each step. Is there any way that I can trace each step and what will be the value at that step/after completing that step. Can any one please help me here?

Solution

If you want to run your program line-by-line, great tools exist that are called debuggers. You should use python debugger (pdb).

If you use PyCharm, a graphical interface is provided for it and show the variable contents