Using a function to create a instance of a class.

Question

To meet the specifications of a program I'm writing I need to be able to generate an instance of a class on the fly that can be referenced easily by other parts of the code.

I've looked around and can't find an answer to this, can I do this within python or not?

Thank you to all replies in advanced.

Possible duplicate of Creating an Instance of a Class with a variable in Python — Hamms
– Hamms, Commented May 16, 2017 at 23:27
This is very vague. What do you mean by "on the fly"? What do you mean by "referenced easily"? — RobertB
– RobertB, Commented May 16, 2017 at 23:51
I think you are asking for some type of dynamic instantiation. Metaclasses may be an option. Supply some code and someone will be able to directly assist you. — pylang
– pylang, Commented May 17, 2017 at 0:59

MSeifert · Accepted Answer · 2017-05-16 23:36:36Z

1

Yes, it's possible.

For example you could create an instance and return it from a function:

def some_function():
    some_instance = int('10')
    return some_instance

a = some_function()   # returns an instance and store it under the name "a"
print(a + 10)  # 20

You could also use global (I wouldn't recommend it though):

a = None

def some_other_function():
    # tell the function that you intend to alter the global variable "a",
    # not a local variable "a"
    global a   
    a = int('10')

some_other_function()  # changes the global variable "a"
print(a)   # 10

answered May 16, 2017 at 23:36

MSeifert

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