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[英]How to call a method in python that is in a different class, where the class is in a different file?
[英]Call class method with different class
我们假设我们有以下两个类:
class Class1:
def method(self):
print("Class1.method() with self =", self)
@classmethod
def clsmethod(cls):
print("Class1.clsmethod() with cls =", cls)
obj1 = Class1()
class Class2:
def method(self):
print("Class2.method() with self =", self)
@classmethod
def clsmethod(cls):
print("Class2.clsmethod() with cls =", cls)
obj2 = Class2()
对于正常的绑定方法,很容易注入不同的自我。 我们只需调用Class1
的method()
但使用obj2
作为self
:
>>> Class1.method(o2)
Class1.method() with self = <__main__.Class2 object at 0x...>
现在的问题是:我怎么能用类方法做类似的事情呢?
>>> Class1.clsmethod(Class2)
Class1.clsmethod() with cls = <__main__.Class2 object at 0x...>
什么样的Class1
必须被替换? 使用type(Class1)
(“类Class1
”类似于“ obj1
类” type(Class1)
的直观方法不起作用,因为类方法不是元类的属性。
通过访问__func__
属性,您可以获得未绑定的函数对象。
class Class1:
def method(self):
print("Class1.method() with self =", self)
@classmethod
def clsmethod(cls):
print("Class1.clsmethod() with cls =", cls)
class Class2:
def method(self):
print("Class2.method() with self =", self)
@classmethod
def clsmethod(cls):
print("Class2.clsmethod() with cls =", cls)
Class1.clsmethod.__func__(Class2) # <----
# prints
# Class1.clsmethod() with cls = <class '__main__.Class2'>
Class2.clsmethod.__func__(Class1) # <----
# prints
# Class2.clsmethod() with cls = <class '__main__.Class1'>
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