Python nested classes: self is not defined

Question

I would like to do the following things:
user = Get()

user.username

user.youtube.name
user.youtube.subs

user.twitter.name
user.twitter.subs

user.twitter.open()

This is the code I have:
class Get():
    def __init__(self, username):
        self.username = username

class youtube:
        self.name = "NameOfTheUserOnYoutube"
        self.subs = 123456

class twitter:
        def open():
            webbrowser.open("https://www.twitter.com/NameOfTheUserOnTwitter")

self.name = "NameOfTheUserOnTwitter"
        self.subs = 654321

But when I execute this, the following error occurs:
File "mycode.py", line 9, in youtube
    self.name = "NameOfTheUserOnYoutube"
NameError: name 'self' is not defined

Barmar · Answer

A nested class is not automatically an attribute. You need to create attributes as well, and call the class to create instances.
class Get():
    def __init__(self, username):
        self.username = username
        self.youtube = Get.Youtube()
        self.twitter = Get.Twitter()

class Youtube:
        def __init__(self):
            self.name = "NameOfTheUserOnYoutube"
            self.subs = 123456

class Twitter:
        def __init__(self):
            self.name = "NameOfTheUserOnTwitter"
            self.subs = 654321
        def open(self):
            webbrowser.open("https://www.twitter.com/" + self.name)

user = Get('barmar')

print(user.username)
print(user.youtube.name, user.youtube.subs)
print(user.twitter.name, user.twitter.subs)

user.twitter.open()

Python nested classes: self is not defined

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