Introduction to the role of __init__ in Python

It's strange to see a function name in Python, __init__ I know the underlined function will run automatically, but I don't know the exact meaning of it.

See Today << Concise Python Tutorial >> 11th, Object-oriented programming, which describes it as: "Annotations to c++/java/c# programmers

All of the class members (including data members) in Python are public and all methods are valid.

There is only one exception: if you use a data member name with a double-underscore prefix such as __privatevar,python's name management system, it effectively takes it as a private variable.

This makes it a rule that if a variable is only meant to be used in a class or object, it should be prefixed with a single underscore. Other names will be public and can be used by other classes/objects. Remember that this is only a convention, not what Python requires (unlike a double underscore prefix).

Similarly, note that the __del__ method is similar to the concept of destructor. "

Suddenly the original __init__ in the class is used as a constructor, fixed also written, seemingly very rigid, in fact, there is a reason

def __init__ (self, name):    "Initializes the person ' s data.    " Self.name = name "    print ' (Initializing%s) '% self.name    # When the" is created ", he/she    # adds to the pop Ulation    person.population + = 1

The name variable belongs to the object (it uses the self assignment) and therefore is the object's variable

The value of Self.name is specified on a per-object basis, which indicates the nature of the variable it acts as an object.