Python Neutron class inherits the __init__ method instance of the parent class _python

Objective

Students who have used python to write object-oriented code may be familiar with __init__ methods that ，__init__ run immediately when an object in a class is created. This method can be used to do some of the initialization you want for your object.

Note: This name starts and ends with a double underline.

Parent Class A

Class A (object):
 def __init__ (self, name):
  self.name=name
  print "Name:", Self.name
 def getName (self ): Return
  ' A ' + self.name

Subclass is not overridden __init__ , the parent class definition is automatically invoked when the subclass is instantiated.__init__

Class B (A):
 def getName (self): return
  ' B ' +self.name
 
if __name__== ' __main__ ':
 b=b (' Hello ')
 Print B.getname ()

Perform

$python lei2.py 
name:hello
B Hello

When overridden, __init__ instantiates a subclass and does not call the parent class that has already been defined__init__

Class A (object):
 def __init__ (self, name):
  self.name=name
  print "Name:", Self.name
 def getName (self) : Return
  ' a ' + Self.name

class B (a):
 def __init__ (self, name):
  print "HI"
  self.name = name
 def GetName (self): return
  ' B ' +self.name

if __name__== ' __main__ ':
 b=b (' hello ')
 print b.getname ()

Perform

$python lei2.py 
hi
B Hello

In order to be able to use or extend the behavior of the parent class, it is best to show methods that invoke the parent class __init__

Class A (object):
 def __init__ (self, name):
  self.name=name
  print "Name:", Self.name
 def getName ( Self): return
  ' A ' + Self.name

class B (a):
 def __init__ (self, name):
  super (B, self). __INIT__ (name)
  print "Hi"
  self.name = name
 def getName (self): return
  ' B ' +self.name

if __name__== ' __main__ ':
 b=b (' hello ')
 print b.getname ()

Perform

$python lei2.py
name:hello
hi
B Hello

Summarize

The above is about the Python subclass inherits the parent class the whole content of the __init__ method, hope this article's content to everybody's study or work can bring certain help, if has the question everybody may the message exchange.