CODEWITHSUNDEEP
python
Sumit
Sumit

Reputation: 2023

Can we access class method variable using dot notation in python

Below is the code

import os

class ABC:
    def test(self,name):
        var = 5
        var2 = 10
        dic = {"Ada": "adada"}
        print "asdfdsadv"
        var1 = "Ada"
        var2 = "asada"

obj = ABC()
print obj.test("Ada").var1

I am looking for something like this. Can I achieve this in python

I know this is var variable in local to class. Is there someway by using global or something else to acheive this

Upvotes: 1

Views: 5748

Answers (5)

Gsk
Gsk

Reputation: 2945

What you are looking for are the class variables, usually defined as self.variable. Here an example of your code:

import os

class ABC:
    def __init__(self):
        self.var = 5
        self.var2 = 10
        self.dic = {"Ada": "adada"}
        self.var1 = "Ada"
    def test(self,name):
        print self.var
        print self.var2
        print self.var1 + " " + name

obj = ABC()
print obj.dic # {'Ada': 'adada'}
print obj.dic["Ada"] # adada
obj.test("wow") # 5, 10, Ada wow
obj.var1 = "Ede"
obj.test("wow") # 5, 10, Ede wow

but as suggested in other answers, you may want to take a step back and check what is the scope of python variables

Upvotes: 2

Matthias
Matthias

Reputation: 13232

If you return the object itself from the function and the variables are not local but instance variables it works.

class ABC:
    def test(self, name):
        self.var1 = "My name is {}".format(name)
        return self

obj = ABC()
print obj.test('Ada').var1

Upvotes: 1

Sharku
Sharku

Reputation: 1092

I think this would work. The init(self) behave like a constructor in other languages. So in effect I am constructing a class in a class, to make your last line work properly. But like other suggested that is not the way Python is supposed to be used.

import os

class ABC(object):
    def __init__(self):
        pass

    class test(object):
        def __init__(self,name):
            self.var = 5
            self.var2 = 10
            self.dic = {"Ada": "adada"}
            print ("asdfdsadv")
            self.var1 = "Ada"
            self.var2 = "asada"

if __name__ == "__main__":
    obj = ABC()
    print (obj.test("Ada").var1)

Upvotes: 2

bboumend
bboumend

Reputation: 510

Accessing a variable from a class method is not possible, you have to set the variable at the class level like this:

import os

class ABC:
    def test(self,name):
        var = 5
        var2 = 10
        dic = {"Ada": "adada"}
        print "asdfdsadv"
        self.var1 = "Ada"
        var2 = "asada"

obj = ABC()
obj.test('Ada')
print obj.var1

You could chain obj.test('Ada').var1 in the same line by returning self into your test method.

Upvotes: 2

Joe Iddon
Joe Iddon

Reputation: 20434

Forget about classes and consider functions in general.

When you define a function, any variables within its scope are local and only accessible from within the execution of that function. Once execution has finished, that's it, they are gone. This is fundamental; the only way of getting data from a function is by returning it.

Although it is a hack, you could return locals() (a dictionary of local variables), but this is terrible practice.

import os

class ABC:
    def test(self,name):
        var = 5
        var2 = 10
        dic = {"Ada": "adada"}
        print "asdfdsadv"
        var1 = "Ada"
        var2 = "asada"
        return locals()

obj = ABC()
print obj.test("Ada")["var1"]

Upvotes: 1

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