Class special member of call

#!/usr/bin/env python
# _*_coding:utf-8 _*_
class SpecialMembers:
  #  Class constructor
  def __init__(self):
    print("My Blog is Url: http://yw666.blog.51cto.com")
  #  Object constructor
  def __call__(self):
    print("My Name is: Yangwen")
#  create 1 And execute the constructor of the class
obj = SpecialMembers()
#  Executes the constructor of the object
obj()
#  First execute the class constructor, then the object constructor
SpecialMembers()()

The output

yangwen@Darker:~$ python3 /home/yangwen/ The document /Python_code/sublime/Week06/Day04/s2.py
My Blog is Url: http://yw666.blog.51cto.com
My Name is: Yangwen
My Blog is Url: http://yw666.blog.51cto.com
My Name is: Yangwen

Class getitem, setitem, delitem

#!/usr/bin/env python
# _*_coding:utf-8 _*_
class SpecialMembers:
  #  When you perform obj['value'] Will be automatically executed __getitem__ Method and treat the value inside the object's parentheses as __getitem__ The value of the
  def __getitem__(self, item):
    print(item)
  def __setitem__(self, key, value):
    print(key, value)
  def __delitem__(self, key):
    print(key)
#  create 1 An object
obj = SpecialMembers()
#  automated __getitem__ methods
obj['value']
#  automated __setitem__ methods
obj['k1'] = "values"
#  automated __delitem__ methods
del obj['key']

The output

ansheng@Darker:~$ python3 /home/yangwen/ The document /Python_code/sublime/Week06/Day04/s2.py
value
k1 values
key

special

#!/usr/bin/env python
# _*_coding:utf-8 _*_
class SpecialMembers:
  #  When you perform obj['value'] Will be automatically executed __getitem__ Method and treat the value inside the object's parentheses as __getitem__ The value of the
  def __getitem__(self, item):
    print(item, type(item), "__getitem__")
  def __setitem__(self, key, value):
    print(key, value)
  def __delitem__(self, key):
    print(key)
#  create 1 An object
obj = SpecialMembers()
#  automated __getitem__ methods
obj[1:3] # __getslice__/__getitem__
#  automated __setitem__ methods
obj[1:3] = [11, 22, 33] # __setslice__/__setitem__
#  automated __delitem__
del obj[1:3] # __delslice__/__delitem__

The output

yangwen@Darker:~$ python3 /home/yangwen/ The document /Python_code/sublime/Week06/Day04/s2.py
slice(1, 3, None) <class 'slice'> __getitem__
slice(1, 3, None) [11, 22, 33]
slice(1, 3, None)

dict for a special member of class

Gets all members of a class or object

#!/usr/bin/env python
# _*_coding:utf-8 _*_
class SpecialMembers:
  """
   Class notes
  """
  def __init__(self):
    self.Name = "Ansheng"
    self.Blog = "http://yw666.blog.51cto.com"
#  Gets a member of a class
print(SpecialMembers.__dict__)
#  create 1 An object
obj = SpecialMembers()
#  Gets a member of an object
print(obj.__dict__)

The output

yangwen@Darker:~$ python3 /home/yangwen/ The document /Python_code/sublime/Week06/Day04/s2.py
{'__weakref__': <attribute '__weakref__' of 'SpecialMembers' objects>, '__doc__': '\n   Class notes \n  ', '__module__': '__main__', '__dict__': <attribute '__dict__' of 'SpecialMembers' objects>, '__init__': <function SpecialMembers.__init__ at 0x7ff2af2d7598>}
{'Blog': 'http://yw666.blog.51cto.com', 'Name': 'Yangwen'}

Class special member of iter

If one object can be iterated by the for loop, then the method with yield value in the object is indicated.

#!/usr/bin/env python
# _*_coding:utf-8 _*_
class SpecialMembers:
  def __iter__(self):
    yield 1
    yield 2
    yield 3
#  create 1 An object
obj = SpecialMembers()
#  If you execute for When the object is looped, the object is automatically executed __iter__ Method, at this point __iter__ is 1 A generator
for i in obj:
  print(i)

The output

yangwen@Darker:~$ python3 /home/yangwen/ The document /Python_code/sublime/Week06/Day04/s2.py
1
2
3