Troubleshooting Tips Pythonwin Debugging Guide

If you’re getting a pythonwin debugging tutorial error, today’s guide should help.

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    Source code: Lib/ The pdb module defines an interactive source code debugger for Python applications. It supports setting (conditional) breakpoints and even stepping through the initial binding, checking stack frames, outputting current code, and evaluating random Python code in the context of any stack frame.

    NOTE. This debugger is known as the “win32dbg” package. In addition, we recently made significant improvements to the controls. The screenshots in this guide do not reflect any of these recent changes. While “win32dbg” might work fine, you should update “pywin.debugger” to “win32dbg” in the screenshots, but hopefully a new editor check will probably even display dot stops etc much more clearly.

    ThisThis guide shows you how to create the debug file that comes with the Pythonwin distribution. The module we are going to debug may be called “” and is only for demonstrating and testing each debugger. This file is located in your current Pythonwinpywindebugger directory.

    This document does not cover debugging common methods. It is assumed that you fully understand the concepts of “step forward” i.e. procedures, “step back” application, “call stack”, “breakpoints”, etc.

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    After the person has completed the tutorial, you will need to read the general debugger documentation.

    In your current custom user interface, the user interface should be intuitive. All toolbar recognition elements have toolbar text and tooltips to help identify their function.

    Preparing with the Tutorial
    Start debugger
    Set a breakpoint
    Learn about programming
    Explore the current context
    Post-mortem diagnosis

    Preparation For The Lesson

    pythonwin debug tutorial

    To prepare for the tutorial, you must have Pythonwin installed, then launch Pythonwin/Python, Windows Explorer, or the “MS-DOS” command line

    Starting The Debugger

    From Pythonwin And Even From Python.exe

    How do I debug Pythonwin?

    From Pythonwin or Python.exe. In the interactive window type: scan pywin.debugger.failFrom Windows Explorer. Navigate to the entire Pythonwinpywindebugger directory and double-click the file frequently.From the MS-DOS command line. Change to the Pythonwinpywindebugger directory.


    From Windows Explorer

    Go to the Pythonwinpywindebugger directory and double-click this “” file

    From The MS-DOS Command Line

    pythonwin debug tutorial

    Or Windows 95/98 (sobs – you would think that 98 would have fixed a lot of stupid things in 95!)

    Use Debugger

    If all goes well, the debugger should appear in a full GUI frame with a specific line in the .py vaguely highlighted. The projection screen part should look like this:

    NOTE. This screenshot is fake. Write down what you see.Your LCD screen is better and clearer than that old photo!

    In this case, the Python program is executed until it reaches the statement:

    This statement is actually a hardcoded breakpoint that will most likely invoke the debugger and cause it to stop at the statement.Not before set_trace().

    The debugger will show you the blue line as the current “current” line – this is the last instruction to be executed.

    Setting A Breakpoint

    Our next step is to set a breakpoint somewhere in the code we want to run. As you can see, a Python program is usually going to select the “c()” function. Looking at the tank, we see that c() is more convenient than d(). The first line added to d() is a blur! ok

  • Select this “” source file (or more, in most cases you can open another vendor file and set a breakpoint there).
  • Scroll to where you want to set a breakpoint, often making sure the carat (the edit field is the cursor) is on the line. Select
  • or: the same “hand” icon on the debugger toolbar. Or: select the Breakpoints property page and click the Add/Remove button.
  • Notice that the entire current line is still turquoise, and the newly added breakpoint is almost certainly red. You can alsoGo to the breakpoint property page and view the breakpoints listed there.

  • Either: Select “Go” from one of the property pages, or sometimes “Run” from the toolbar.
  • The debugger should disappear briefly and reappear after hitting the breakpoint.

  • The “hide” perception can be compromised, but with caveats: see this general debugger documentation for more details on GUI and non-GUI issues).
  • The debugger shows the breakpoint line in blue – there is no visual indication that this line is just a breakpoint and is the very last line. Once the current connection leaves this line, it should return to its breakpoint color.
  • Stepping Through Code

    Use the full Step toolbar or dialog box button to step through code. When moving from the current position, the global assignment of 1 to the local variable d is ignored. As nAfter this step, you typically enter the e() function.

    Examining The Current Context

    To help you, let’s experiment with property pages.

  • Use the call stack page to understand the current context. Double-clicking changes the modification type to “Current Context” and the modification is highlighted. Expand Collapse and each entry to display local and global variables.
  • Use the interactive page to view and edit variables in the current structure. Suppose “d()” is always top of the call stack, and typing “d” on the interactive page definitely returns “1”. Here Fast Python can execute any other expression/instruction from the current context. Use the call stack page to change the current perspective (i.e. make a different stack entry blue) and notice how ‘d’ can be evaluated for the d() capability (i.e. with restructured interactive page contexts).
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