Using variables without self in a class- Python

Question

I have a question about why the code below executes what it does.

class Account:
    def __init__(self, id):
        self.id = id
        id = 800
        id = self.id + id

acc = Account(123)
print(acc.id)

Why would this code print 123 instead of 923? Why does the id not work inside of the class?

because you are setting id = self.id + id not self.id = self.id + id. id != self.id, they are two completely different variables. acc.id would return the value of self.id — R Nar
– R Nar, Commented Nov 17, 2015 at 22:09

ParisNakitaKejser · Accepted Answer · 2021-08-04 12:50:44Z

11

You declare the variable in the scope to self.id + id, when the init function is finished the scope is gone and therefore id doesn't exist anymore.

Probably, you wanted to do:

self.id += id

edited Aug 4, 2021 at 12:50

ParisNakitaKejser

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answered Nov 17, 2015 at 22:10

mrhn

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Comments

Loïc G. · Accepted Answer · 2015-11-17 22:12:06Z

3

id is local variable inside __init__, you cannot access it outside this method.

When you access to acc.id, you access to the id attribute of the Account class.

Attributes are preceded by self inside the class

answered Nov 17, 2015 at 22:12

Loïc G.

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