Python replace class object.variable with value in place

Question

I am thinking is there any way to replace a object.variable with value in place for class object.

For example:

class A:
    def __init__(self,a):
        self.attr1 = a

a_obj1 = A('Name1')
print(a_obj1.attr1)

Prints Name1

And if I keep the attr1 in a variable, and try to access it, then it

a_obj2 = A('Name2')
attrName = 'attr1'
print(a_obj2.attrName)

Shows AttributeError: 'A' object has no attribute 'attrName'

My understanding is that the REPL parser of python probably not expanding any thing after . which makes sense. But is there any way to achieve this? In particular combine a varaible's value with another variable to make a variable?

Update: Thanks chris . Found the solution.

You need getattr: try getattr(a_obj2, attrName)

Chris
– Chris

2019-12-31 04:15:08 +00:00
Commented Dec 31, 2019 at 4:15 — Chris
– Chris, Commented Dec 31, 2019 at 4:15

Rachit Kumar · Accepted Answer · 2019-12-31 04:25:20Z

1

try it

class A:
    def __init__(self,a):
        self.attr1 = a

a_obj1 = A('Name1')
print(a_obj1.attr1)
a_obj2 = A('Name2')
attrName = 'attr1'
print(getattr(a_obj2, attrName))

answered Dec 31, 2019 at 4:25

Rachit Kumar

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Comments

Theo · Accepted Answer · 2019-12-31 04:23:24Z

1

Use getattr() with the format gettattr(a_obj, attrName)

answered Dec 31, 2019 at 4:23

Theo

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