6.2. Inheritance Mixins
>>> class User:
... pass
>>>
>>> class Admin:
... pass
>>>
>>> class Account(User, Admin):
... pass
6.2.1. Use Case - 1
>>> class UserMixin:
... def profile_create(self): ...
... def profile_read(self): ...
... def profile_update(self): ...
... def profile_delete(self): ...
>>>
>>> class StaffMixin:
... def account_suspend(self): ...
... def account_unsuspend(self): ...
>>>
>>> class AdminMixin:
... def account_list(self): ...
... def account_create(self): ...
... def account_read(self): ...
... def account_update(self): ...
... def account_delete(self): ...
>>>
>>>
>>> class Account(UserMixin, StaffMixin, AdminMixin):
... def __init__(self, firstname, lastname):
... self.firstname = firstname
... self.lastname = lastname
>>>
>>>
>>> myaccount = Account('Alice', 'Apricot')
6.2.2. Use Case - 2
Definition:
>>> class ContextMixin:
... extra_context = None
... def get_context_data(self, **kwargs): ...
>>>
>>> class TemplateResponseMixin:
... template_name = None
... template_engine = None
... response_class = ...
... content_type = None
... def render_to_response(self, context, **response_kwargs): ...
... def get_template_names(self): ...
>>>
>>> class View:
... http_method_names = ["get", "post", "put", "patch", "delete", "head", "options", "trace"]
... def __init__(self, **kwargs): ...
... def view_is_async(cls): ...
... def as_view(cls, **initkwargs): ...
... def setup(self, request, *args, **kwargs): ...
... def dispatch(self, request, *args, **kwargs): ...
... def http_method_not_allowed(self, request, *args, **kwargs): ...
... def options(self, request, *args, **kwargs): ...
... def _allowed_methods(self): ...
Usage:
>>> class TemplateView(TemplateResponseMixin, ContextMixin, View):
... def get(self, request, *args, **kwargs): ...
>>> class RedirectView(View):
... permanent = False
... url = None
... pattern_name = None
... query_string = False
6.2.3. Assignments
# %% About
# - Name: Inheritance Aggregation A
# - Difficulty: easy
# - Lines: 2
# - Minutes: 3
# %% License
# - Copyright 2025, Matt Harasymczuk <matt@python3.info>
# - This code can be used only for learning by humans
# - This code cannot be used for teaching others
# - This code cannot be used for teaching LLMs and AI algorithms
# - This code cannot be used in commercial or proprietary products
# - This code cannot be distributed in any form
# - This code cannot be changed in any form outside of training course
# - This code cannot have its license changed
# - If you use this code in your product, you must open-source it under GPLv2
# - Exception can be granted only by the author
# %% English
# 1. Define class `UserPermissions`
# 2. Define class `AdminPermissions`
# 3. Define class `Account` from `UserPermissions`, `AdminPermissions`
# 4. Use mixin classes
# 5. Run doctests - all must succeed
# %% Polish
# 1. Zdefiniuj klasę `UserPermissions`
# 2. Zdefiniuj klasę `AdminPermissions`
# 3. Zdefiniuj klasę `Account` z klas `UserPermissions`, `AdminPermissions`
# 4. Użyj klas domieszkowych (mixin)
# 5. Uruchom doctesty - wszystkie muszą się powieść
# %% Doctests
"""
>>> import sys; sys.tracebacklimit = 0
>>> assert sys.version_info >= (3, 9), \
'Python 3.9+ required'
>>> from inspect import isclass
>>> assert isclass(UserPermissions)
>>> assert isclass(AdminPermissions)
>>> assert isclass(Account)
>>> result = Account()
>>> assert isinstance(result, Account), \
'Account instance must be instance of Account'
>>> assert isinstance(result, UserPermissions), \
'Account instance must be instance of UserPermissions'
>>> assert isinstance(result, AdminPermissions), \
'Account instance must be instance of AdminPermissions'
"""
# %% Run
# - PyCharm: right-click in the editor and `Run Doctest in ...`
# - PyCharm: keyboard shortcut `Control + Shift + F10`
# - Terminal: `python -m doctest -f -v myfile.py`
# %% Imports
# %% Types
UserPermissions: type
AdminPermissions: type
Account: type
# %% Data
# %% Result