Saving is the step that writes current editor changes to your source file. Make sure the code you execute is the code you intend to test.
Understanding the Concept
PyCharm normally auto-saves changes, but understanding files and execution is still important. If you edit a script in a second program or have multiple copies open, a run may use an older version or a different path. Check the file tab, run configuration, and project tree before concluding that Python ignored your edit. Running the same code from a terminal uses whatever is actually saved on disk.
When and Why You Would Use This
Use a clearly recognizable message to confirm which file is running. Change it, save if needed, and run again. If the output does not change, inspect the path rather than trying random reinstall steps.
Practical Example
print("Revision A")Understanding the Example
First run should display Revision A. Change the text to Revision B and rerun. If Revision A remains, you may be running a different file or viewing old output.
Example Output
Revision ATry It Yourself
Change Revision A to Revision B, rerun, and identify the exact source file shown in the run configuration.
Common Beginner Mistakes
- Editing one copy of the file while the run configuration points to another.
- Assuming the last visible output always comes from the latest execution.
- Deleting project files to solve an ordinary save-or-path mismatch.
Key Takeaways
- Execution uses code from the selected saved source file.
- PyCharm auto-save behavior does not remove the need to verify paths.
- A recognizable output marker helps identify stale or incorrect runs.