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pythonobjectdynamic
Arrie Charles Jones
Arrie Charles Jones

Reputation: 13

Create class object instance named from string?

I can't find the answer anywhere.

I have a class called "vrf".

I have an input file.

As Python iterates through the lines of this input file, every time it sees the word vrf, I want to create an object named after the next word.

So if it reading the line "ip vrf TESTER", I would like to dynamically create an object named TESTER of type vrf.

TESTER = vrf()

How in the world do I do this?

I've tried:

line.split()[2] = vrf()

Doesn't work.

Upvotes: 1

Views: 843

Answers (4)

ospahiu
ospahiu

Reputation: 3525

What you're trying to do is not a great idea, instead use a dictionary, or if your object has an instance variable that stores name information such as name, bind the data there.

objs = {}
objs[line.split()[2]] = vrf()

or (if available)

v = vrf(line.split()[2])

v = vrf(); v.name = line.split()[2]

Sample output:

print objs
>>> {'vrf' :  <__main__.vrf instance at 0x7f41b4140a28>}

Upvotes: 0

Bryan Oakley
Bryan Oakley

Reputation: 385940

Generally speaking, dynamically created variable names are a bad idea. Instead, you should create a dictionary where the name is the key and the instance is the value

In your case it would look something like this:

objects = {}
...
object_name = line.split()[2]
objects[object_name] = vrf()

Then you can access it this way for your example: objects["TESTER"] will give you the corresponding vrf instance.

Upvotes: 2

m_callens
m_callens

Reputation: 6360

The globals() dictionary can be edited to do this:

>>> globals()['TEST'] = vrf()
>>> type(TEST)
# <class 'vrf'>

Upvotes: 0

Julien
Julien

Reputation: 15071

Why don't you just use a dictionary?

object = {}
object[line.split()[2]] = vrf()

Upvotes: 1

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