Python class Base

          44, class:                     General forms of class definitions:                           1, simple form: instanced objects are not self- Data attributes that are unique to your own. >>> class Fistclass ():...     data1 = ' Hello World ' # # # ==> This is the Data property or class member property of the class. ...     def printdata (self): ###==> This is the method of the class, and there is at least one parameter self!!! ...             print (' nihao%s '%self.data1) ...>>> class1 = Fistclass () ##==& GT, Class instantiation >>> class1.class1.__class__ (         class1.__format__ (      & nbsp class1.__le__ (            class1.__reduce_ex__ (     class1.__weakref__ class1.__delattr__ (       class1.__ge__ (            class1.__lt__ (& nbsp           class1.__repr__ (          class1.data1class1.__dict__           class1.__getattribute__ (  class1.__module__          class1.__setattr__ (       class1.printdata (class1.__dir__ (            class1.__gt__ (            class1.__ne__ (  &nbs P         class1.__sizeof__ (       class1.__doc__            class1.__hash__ (          class1.__new__ (          &NBSP;CLASS1). __str__ (           class1.__eq__             class1.__init__ (           class1.__reduce__ (        class1.__subclasshook__ ( >> > class1.data1 # #类数据属性调用 ' Hello World ' >>> class1.printdata () # #类的方法的调用nihaohello world    & NBSP;&NBSP;&NBSP;&NBSP;2, defining data properties unique to an object:  &NBsp       >>> class Seclass ():...     data1 = ' Hello Seclass ' ...    &NB Sp;def SetData (self,x):...            &NBSP;SELF.STR1 = x...     def printdat A (self):...             print (self.str1) ...>>> ins1 = Seclass () >>> Ins1.ins1.__class__ (         ins1.__format__ (        ins1.__le__ (  & nbsp         ins1.__reduce_ex__ (     ins1.__weakref__ins1.__delattr__ (       ins1.__ge__ (            ins1.__lt__ (            I ns1.__repr__ (          ins1.data1ins1.__dict__           ins1.__ getattribute__ (  ins1.__module__         ins1.__setattr__ (        Ins1.printdata (ins1.__dir__ (  &NBSp        ins1.__gt__ (            ins1.__ne__ (        & nbsp   ins1.__sizeof__ (        Ins1.setdata (ins1.__doc__            INS 1.__hash__ (          ins1.__new__            ins1.__str__ (  & nbsp        ins1.__eq__ (            ins1.__init__ (          ins1.__reduce__ (        ins1.__subclasshook__ ( >>> ins1.data1 ' Hello Seclass '           >>> ins1.setdata (' abc ') >>> ins1.printdata () abc>>> Ins2 = Seclass () >>> ins2.data1 ' Hello seclass ' >>> ins2.setdata (' xy ') >>> ins2.printdata () xy    3, __init__ () method:      When you create an instance, Python automatically calls the __init__ method in the class to implicitly provide properties for the instance.     &NBSP;__INIT__ is called a constructor.       such asThe __init__ method is not defined in the fruit class, the first instance is simply creating a simple namespace.      >>> class Thirdclass ():...     data3 = ' Hello Thirdclass ' ...    &NB Sp;def __init__ (self,who):...             self.name = who...>>> Ins3 = THIRDCL (' Lucy ') >>> ins3.ins3.__class__ (         ins3.__format__ (     )   ins3.__le__ (            ins3.__reduce_ex__ (     ins3.__weakref__ ins3.__delattr__ (       ins3.__ge__ (            ins3.__lt__ (  & nbsp         ins3.__repr__ (          ins3.data3ins3.__dict__      & nbsp    ins3.__getattribute__ (  ins3.__module__         ins3.__setattr__ (       ins3.nameins3.__dir__ (           ins3.__gt__ (      & nbsp;     ins3.__ne__ (            ins3.__sizeof__ (       ins3.__doc) __            ins3.__hash__ (          ins3.__new__ (    &N Bsp      ins3.__str__            ins3.__eq__ (          & nbsp ins3.__init__ (          ins3.__reduce__ (        ins3.__subclasshook__ (  >>> ins3.data3 ' Hello thirdclass ' >>> ins3.name ' Lucy '    4, __dict__:     >>> ins3.__dict__ property of the instance, {' Name ': ' Lucy '}>>> thirdclass.__dict__ class. Mappingproxy ({' data3 ': ' Hello Thirdclass ', ' __init__ ': <function thirdclass.__init__ at 0x7f8e0a440ea0>, ' __dict __ ': <attribute ' __dict__ ' of ' thirdclass ' objects>, ' __module__ ': ' __main__ ', ' __doc__ ': None, ' __weakref__ ': < Attribute ' __weakref__ ' of ' Thirdclass ' objects>})   &NBSP;5, variables available in class:     >>> Class C1 ():...     var1 = ' Hello C1 ' ###==> class static variables!!! ...     def __init__ (self,who):...             self.insdata = who ###==& A gt; an instance variable. ...             self.name = ' 123 ' ###==> Local variables: This method only. ...>>> ins1 = C1 () >>> ins1.ins1.__class__ (         ins1.__format__ (        ins1.__le__ (            ins1.__reduce_ex__ (     ins1.__ weakref__ins1.__delattr__ (       ins1.__ge__ (            ins1.__lt__ (             ins1.__repr__ (          INS1.INSDATAINS1.__DICT__&NBSP ;          ins1.__getattribute__ (  ins1.__module__         ins1.__ setattr__ (       ins1.nameins1.__dir__ (&NBsp          ins1.__gt__ (            ins1.__ne__ (      & nbsp     ins1.__sizeof__ (        ins1.var1ins1.__doc__            I Ns1.__hash__ (          ins1.__new__ (          &NBSP;INS1.__STR__ (            ins1.__eq__ (            ins1.__init__ (   )       ins1.__reduce__ (        ins1.__subclasshook__ ( >>> ins1.name ') 123 ' >>> ins1.var1 ' Hello C1 ' >>> ins1.insdata12   6, class inheritance: Python allows multiple inheritance, property search methods: From left to right, bottom to top.      >>> class PClass (object):...     gender = ' Male ' ...    &NBSP;DEF __ init__ (self,who):...             self.name = who...>>> class Cclass (PClass): ...     def DisplayinfO (self):...             print (self.gender,self.name) ...>>> ins1 = Cclass (' Lucy ') >>> ins1.ins1.__class__ (         ins1.__format__ (        ins1.__le__ (            ins1.__reduce_ex__ (     ins1.__weakref__ins1.__ delattr__ (       ins1.__ge__ (            ins1.__lt__ (    &NBS P       ins1.__repr__ (          Ins1.displayinfo (ins1.__dict__           ins1.__getattribute__ (  ins1.__module__        &NBSP;INS1.__SETATTR__ (        ins1.genderins1.__dir__ (           ins1.__gt__ (    & nbsp       ins1.__ne__ (            ins1.__sizeof__ (        INS 1.nameins1.__doc__      &NBSp     ins1.__hash__           ins1.__new__ (          &NBSP;INS1. __str__ (           ins1.__eq__             ins1.__init__ (&nbs P         ins1.__reduce__ (        ins1.__subclasshook__ ( >>> Ins1.gender ' Male ' >>> ins1.name ' Lucy ' >>> ins1.displayinfo () male Lucy

Python Class class basics