Python: access class attribute by variable

Question

in python how to access instance's attribute as cls.variable format?

(in ruby, it can be in format cls.#{variable} )

>>>cls.classname
u'CIM_RegisteredProfile'

>>>var='classname'

>>>cls.var
Traceback (most recent call last):
  File "<console>", line 0, in <module>
AttributeError: 'CIMClass' object has no attribute 'var'

possible duplicate of Python: Accessing an attribute using a variable — S.Lott
– S.Lott, Commented Jan 17, 2012 at 3:49

Rob Wouters · Accepted Answer · 2012-01-17 03:38:37Z

21

Use getattr:

var = 'classname'
getattr(cls, var)

answered Jan 17, 2012 at 3:38

Rob Wouters

16.4k3 gold badges44 silver badges36 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

brike Over a year ago

b="a."+var b 'a.classname' eval(b) u'CIM_RegisteredProfile'

Rob Wouters Over a year ago

@brike, try to avoid eval whenever possible. Read the answers on this SO question or google "eval is evil".

MRAB Over a year ago

getattr is the Pythonic answer.

wim Over a year ago

I'm tempted to flag that suggestion of eval as an alternative as 'offensive'

Collectives™ on Stack Overflow

Python: access class attribute by variable

1 Answer 1

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related