Posted By: Joan Venge
Is it possible to declare a variable in Python, like so?:
so that it initialized to None? It seems like Python allows this, but as soon as you access it, it crashes. Is this possible? If not, why?
EDIT: I want to do this for cases like this:
value for index in sequence: if value == None and conditionMet: value = index break
- Uninitialised value in python (by same author)
- Are there any declaration keywords in Python? (by the same author)
Why not just do this:
var = None
Python is dynamic, so you don’t need to declare things; they exist automatically in the first scope where they’re assigned. So, all you need is a regular old assignment statement as above.
This is nice, because you’ll never end up with an uninitialized variable. But be careful — this doesn’t mean that you won’t end up with incorrectly initialized variables. If you init something to
None, make sure that’s what you really want, and assign something more meaningful if you can.