how to call a class method in python

Question

I have the following class:

class SoftwarePackage:
    def __init__(self, name, description, order_of_installation, url):
        self.name = name
        self.description = description
        self.order_of_installation = order_of_installation
        self.url = "http://localhost:9090/api/software_package"

        def create():
            post_data = {"name": self.name, "description": self.description,
                         "order_of_installation": self.order_of_installation}
            post_data = json.dumps(post_data)
            req = urllib2.Request(url, post_data)

            req.add_header('Content-Type', 'application/json')
            return urllib2.urlopen(req, post_data)

When I try to call the "create" method like this:

sp = SoftwarePackage(name="my-package-1", description="my-package-1-desc", order_of_installation=0, url="")
sp.create()

I get this error:

   sp.create()
AttributeError: SoftwarePackage instance has no attribute 'create'

What is the proper way to call this class method?

Martijn Pieters · Accepted Answer · 2015-02-09 21:15:26Z

4

You made create a nested function; you indented it to far and it is part of the __init__ method. It is currently a local variable in that method and not usable.

Unindent the whole function to be level with def __init__(...):, and add a self argument:

class SoftwarePackage:
    def __init__(self, name, description, order_of_installation, url):
        self.name = name
        self.description = description
        self.order_of_installation = order_of_installation
        self.url = "http://localhost:9090/api/software_package"

    def create(self):
        post_data = {"name": self.name, "description": self.description,
                     "order_of_installation": self.order_of_installation}
        post_data = json.dumps(post_data)
        req = urllib2.Request(self.url, post_data)

        req.add_header('Content-Type', 'application/json')
        return urllib2.urlopen(req, post_data)

The url local name is probably meant to be the url attribute on the instance, so I replaced that with self.url.

edited Feb 9, 2015 at 21:15

answered Feb 9, 2015 at 21:09

Martijn Pieters

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Open AI - Opting Out Over a year ago

The url member data needs to be referenced using self

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