PyCharm 2020.2 Help


Start a debug session

  1. To debug CoffeeScript, TypeScript, and Dart code, you need to generate a source map for it. This will set the correspondence between lines in your original code and in the generated JavaScript code. If no source map is generated, your breakpoints will not be recognized and processed correctly.

  2. Define a run/debug configuration for the application to be debugged.

  3. Create breakpoints.

  4. Click the Debug <configuration_name> button Debug. Learn more from Starting the Debugger Session.

After you've started a debug session, the Debug icon that marks the Debug tool window toggles to the Active Debugger icon to indicate that the debug process is active.


After you have configured a run configuration for your project, you can launch it in debug mode by pressing Shift+F9.

In the Debug tool window you can see the list of frames and threads with their states, variables and watches. When you select a frame, you see the variables corresponding to the selected frame.


Customize breakpoint settings

To customize breakpoint settings, press Ctrl+Shift+F8. To see all breakpoints in the project (with additional settings), click More or press the same shortcut Ctrl+Shift+F8 again.

Breakpoint properties

    Do not suspend code execution

    Use action breakpoints to evaluate a variable at a particular line of code without suspending code execution. To create an action breakpoint, click the gutter while pressing Shift.

    Adding an action breakpoint

      Create a temporary breakpoint

      To create a breakpoint that stops only once, click the left gutter while holding Shift+Alt. For more information, refer to the section Breakpoints.

      Setting a temporary breakpoint

        Disable breakpoints

        To disable a breakpoint, click the breakpoint while pressing Alt. Refer to the section Breakpoints for details.

        Disabling breakepoints

          Debugger session

          Smart step into

          Sometimes it happens that you stay at a line and want to step into a particular method but not the first one that will be invoked. In this case use Smart step into by pressing Shift+F7 to choose a particular method.

          Refer to the section Choosing a Method to Step Into for details.

            Run to cursor

            1. Create a breakpoint.

            2. Run a debugging session. To run a debugging session, click the Run Application icon (the Run Application icon) in the gutter area and select Debug <configuration_name>.

            To stop code execution at the cursor position without adding another breakpoint, click the Run to cursor icon (the Run to cursor icon) or press Alt+F9. Alternatively, you can click the line number in the gutter area.

            Run to cursor

            The icon Run to Cursor is described in the toolbar reference of the Debug tool window.

            Evaluate expression

            In the debug mode, you can evaluate an expression by pressing Alt+F8.

            Evaluate expressions

            The Evaluate dialog supports code completion.

            To see how the behavior of various function calls changes during your debugging session, set custom watches. You can read more about watches in Adding, editing and removing watches.

            py evaluate expression png

            Refer to the section Evaluating Expressions for details.

              Configuring debugger settings

              To change debugger settings, click File | Settings. In the Settings menu, click Build, Execution, Deployment | Debugger.

                Useful debugger shortcuts

                Toggle breakpointCtrl+F8
                Resume programF9
                Step overF8
                Step intoF7
                View breakpoint details/all breakpointsCtrl+Shift+F8
                Debug code at caretShift+F9(within the main method), or Alt+Shift+F9
                Last modified: Wed Aug 19 14:24:29 UTC 2020