Having trouble defining variable, Python 3.9, Spyder IDE [closed]

Question

longitude[:] = lon

Code analysis says longitude variable not defined.

Answer 1

Use:

longitude = lon

but make sure lon has been defined first.

longitude[:] can only be used when longitude is previously assigned. Even then it is not a great way to define or reassign variables.

If you are trying to copy lon to longitude here is an example:

lon = [1,2,3]
longitude = lon[:] 
print(lon)

Output:

[1, 2, 3]

Here you can use [:] to ensure you create an entirely new list. Maybe this is where the confusion came from.