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  • Difference between cls and self in Python classes?
    Why is cls sometimes used instead of self as an argument in Python classes? For example: class Person: def __init__(self, firstname, lastname): self firstname = firstname self
  • python - What does cls() function do inside a class method? - Stack . . .
    This doesn't really answer the OP's question as to what cls() does in the classmethod he has seen As I've stated (@classmethods aside) it's a factory As I've stated (@classmethods aside) it's a factory
  • class - Python - self, no self and cls - Stack Overflow
    class Foo(object): # you couldn't use self or cls out here, they wouldn't mean anything # this is a class attribute thing = 'athing' def __init__(self, bar): # I want other methods called on this instance of Foo # to have access to bar, so I create an attribute of self # pointing to it self bar = bar @staticmethod def default_foo(): # static methods are often used as alternate constructors
  • python中的cls到底指的是什么，与self有什么区别? - 知乎
    两个在python里面确实是差不多， cls 是 type 的实例， self 是cls的实例，python2 5以后新类从object继承，object是type的实例，所以所有类都是type的实例，因此类都是cls。type称为类的类或者元类。
  • python - Why are self and cls interchangeable as the first argument . . .
    But as per the naming standard defined within PEP 8 (Style Guide for Python Code), it's better to name self for the first argument to instance methods and cls for the first argument to class methods Function and Method Arguments Always use self for the first argument to instance methods Always use cls for the first argument to class methods
  • python - Understanding the difference between `self`and `cls` and . . .
    @classmethod def getA_c(cls): print(cls A) Now cls will always be a reference to the class, never to the instance I need to stress again that it doesn't actually matter to Python what name I picked for that first argument, but cls is the convention here as that makes it easier to remind the reader that this method is bound to the class object
  • python - How have access to both cls and self in a method - Stack Overflow
    If one could pass both cls and self in the method, this would be easy: # Does not work because `self` is never set @classmethod def foo(cls, self=None): if self: return self name return cls __name__ In these kind of cases, you can use Descriptors to build an object that mimics the behavior you want your method to have:
  • python - Is the cls keyword equivalent to the class name . . . - Stack . . .
    cls isn't a keyword, just like self isn't a keyword No, cls and MyClass aren't interchangeable unless you are positive that MyClass doesn't have any subclasses The point of a @classmethod is to get the right class type if you call it through a subclass for example
  • What is the difference between @staticmethod and @classmethod in Python?
    class Cluster(object): def _is_cluster_for(cls, name): """ see if this class is the cluster with this name this is a classmethod """ return cls __name__ == name _is_cluster_for = classmethod(_is_cluster_for) #static method def getCluster(name): """ static factory method, should be in Cluster class returns a cluster object for the given name """ for cls in Cluster __subclasses__(): if cls _is





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