PCPP1 Graphical User Interface Programming Practice Question
You are creating a simple Tkinter application and notice that your window does not appear on the screen after calling the Tk() constructor. Which method must be called to start the event loop?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
root.mainloop()
The mainloop() method is required to start the Tkinter event loop, which listens for events and updates the display.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
root.show()
Why it's wrong here
The show() method is not part of the Tkinter widget API.
- ✗
root.render()
Why it's wrong here
Tkinter does not use a render() method for window display.
- ✓
root.mainloop()
Why this is correct
mainloop() is the essential method to keep the GUI responsive.
- ✗
root.run()
Why it's wrong here
run() is not a standard Tkinter method.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Python Institute exam blueprint
This PCPP1 practice question is part of Courseiva's free Python Institute certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCPP1 exam.