[英]Python class instances with predefined unique id
I want to create a set of classes, each with their own unique name. 我想创建一组类,每个类都有自己的唯一名称。 Something like this:
像这样:
class B(object):
# existing_ids = []
existing_ids = set()
@staticmethod
def create(my_id):
if my_id not in B.existing_ids:
# B.existing_ids.append(my_id)
B.existing_ids.add(my_id)
# return B(my_id)
else:
return None
# Added block
if style == 'Ba':
return Ba(my_id, style)
else:
return None
def __init__(self, my_id):
self.my_id = my_id
self.style = style # Added
# Added function
def save(self):
with open('{}.pkl'.format(self.my_id), 'ab') as f:
pickle.dump(self.data, f, pickle.HIGHEST_PROTOCOL)
# Added function
def foo(self):
self.data = 'B_data'
# Added class
class Ba(B):
def __init__(self, my_id, style):
super().__init__(my_id, style)
def foo(self):
self.data = 'Ba_data'
# Edited part
a = B.create('a', 'Ba')
b = B.create('b', 'Ba')
c = B.create('b', 'Ba')
print(B.existing_ids, a.existing_ids, b.existing_ids, c)
# {'a', 'b'} {'a', 'b'} {'a', 'b'} None
Is this a good idea? 这是一个好主意吗? Are there better or other ways to do this?
有更好的方法或其他方法吗?
EDIT: I understand that my example was a bit confusing. 编辑:我知道我的例子有点混乱。 I've now updated it a bit to better show what I am trying to achieve.
我现在对其进行了一些更新,以更好地展示我要实现的目标。 For my problem I will also have class Bb(B), class Bc(B), etc.
对于我的问题,我还将拥有Bb(B)类,Bc(B)等类。
This thread seems like the most related: 该线程似乎是最相关的:
Static class variables in Python Python中的静态类变量
The basics: Python - Classes and OOP Basics 基础知识: Python-类和OOP基础知识
Metaclasses could be relevant, but it also goes a bit over my head: 元类可能是相关的,但也让我有些头疼:
What is a metaclass in Python? Python中的元类是什么?
Classmethod vs static method: 类方法与静态方法:
Meaning of @classmethod and @staticmethod for beginner? @classmethod和@staticmethod对初学者的意义?
What is the difference between @staticmethod and @classmethod in Python? Python中的@staticmethod和@classmethod有什么区别?
At the very least, B.create
becomes simpler if you use a set instead of a list to store allocated IDs. 至少,如果使用集合而不是列表来存储分配的ID,则
B.create
变得更简单。
class B(object):
existing_ids = set()
@staticmethod
def create(my_id):
if my_id not in existing_ids:
existing_ids.add(my_id)
return B(my_id)
def __init__(self, my_id):
self.my_id = my_id
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