Python variable not defined
While working with a programming example for my students, I ran into an interesting run-time error when I changed their approach to importing Python’s random module. Here’s the raised error message:
Traceback (most recent call last): File "windowBouncingBalls.py", line 84, in <module> speed = [choice([-2,2]), choice([-2,2])] NameError: name 'choice' is not defined |
You raise the missing choice identifier when two things occur. The first thing requires you to use a standard import statement, like the following example, and the second thing requires you to continue to reference the identifier as “choice“.
import random |
You can avoid the error by making the import of random like this:
from random import * |
Or, you can leave the ordinary import statement and fully qualify the choice identifier with the random module name, like this:
speed = [random.choice([-2,2]), random.choice([-2,2])] |
As always, I hope this helps those who encounter a similar problem.
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