KnowCardPython · GUIs with tkinter
bind and bind_all return a value when you register a handler. What is it, and when do you need it?
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More in GUIs with tkinter
Which GUI toolkit can you import and use without installing anything beyond a standard CPython install?
You build a full tkinter window — root, labels, buttons — and run the script. Nothing appears and the program exits instantly. What's missing?
What is wrong with this button?
```
def greet():
print("hi")
b = tkinter.Button(
root, text="Go",
command=greet())
```
In one tkinter container you call .pack() on one widget and .grid() on another. What happens?
You create a tkinter.Label(root, text="Hi") but never call .pack(), .grid(), or .place() on it. Does it show?
Name tkinter's three geometry managers and the one-line rule for choosing between them.
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