Get an object attribute [duplicate]

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Question :

Get an object attribute [duplicate]

Simple question but since I’m new to python, comming over from php, I get a few errors on it.
I have the following simple class:

        fullName = "John Doe"

user = User()

In PHP I could do the following:

$param = 'fullName';
echo $user->$param; // return John Doe

How do I do this in python?

Asked By: Romeo M.


Answer #1:

To access field or method of an object use dot .:

user = User()
print user.fullName

If a name of the field will be defined at run time, use buildin getattr function:

field_name = "fullName"
print getattr(user, field_name) # prints content of user.fullName
Answered By: Roman Bodnarchuk

Answer #2:

Use getattr if you have an attribute in string form:

>>> class User(object):
       name = 'John'

>>> u = User()
>>> param = 'name'
>>> getattr(u, param)

Otherwise use the dot .:

>>> class User(object):
       name = 'John'

>>> u = User()
Answered By: rubik

Answer #3:

If you need to fetch an object’s property dynamically, use the getattr() function: getattr(user, "fullName") – or to elaborate:

user = User()
property = "fullName"
name = getattr(user, property)

Otherwise just use user.fullName.

Answered By: Shadikka

Answer #4:

You can do the following:

class User(object):
    fullName = "John Doe"

    def __init__(self, name):
        self.SName = name

    def print_names(self):
        print "Names: full name: '%s', name: '%s'" % (self.fullName, self.SName)

user = User('Test Name')

user.fullName # "John Doe"
user.SName # 'Test Name'
user.print_names() # will print you Names: full name: 'John Doe', name: 'Test Name'

E.g any object attributes could be retrieved using istance.

Answered By: Artsiom Rudzenka

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