CODEWITHSUNDEEP
pythonpython-3.xobject
9716278
9716278

Reputation: 2404

defining a var outside of a class used hard in a class giving name error

I created a class using a variable that is declared out side the class and then tried to use that class from a different file. But after using in a different file, defining the variable form that file, I get a name not defined error.

Originally fileOne.py looked like:

dat = 'this string'

class myClass:
    def __init__(self):
        self.num = 5
    def method(self):
        return self.num+dat

Now when I change the lay out, so that dat is defined in the other file that calls myClass.

Changed fileOne.py

#dat = 'this string'

class myClass:
    def __init__(self):
        self.num = 5
    def method(self):
        return self.num+dat

fileTwo.py

from fileOne import *

dat = "file 2 str"
obj = myClass()

I get back

NameError: name 'dat' is not defined.

I think what I need to do in replace dat with self.dat and pass it as a function parameter. I'm not sure why I'm having this problem.

Upvotes: 0

Views: 57

Answers (1)

masasa
masasa

Reputation: 260

your class code does not import dat itself. if you want to use configs in different classes, i suggest the following:

class SystemConfig():
    dat = 5

class myClass(SystemConfig):
    def __init__(self):
        self.num = 5
    def method(self):
        return self.num + SystemConfig.dat

or from a different file:

from fileone import SystemConfig

class myClass(SystemConfig):
    def __init__(self):
        self.num = 5
    def method(self):
        return self.num + SystemConfig.dat

this is much better practice , also lets you run system configuration in one place.

Upvotes: 1

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