Python 36th days ----- special member methods in the class, python 36th days

Python 36th days ----- special member methods in the class, python 36th days

_ Doc _ view the description of the tip

_ Module _ indicates the module where the current operation object is located

_ Class _ indicates the class to which the object of the current operation belongs.

_ Init _ constructor creates an object through the class and runs it automatically.

_ Del _ destructor. The current object is released in the memory and executed automatically.

_ Call _ an object is followed by parentheses to trigger execution

_ Dict _ view members in a class or object

_ Str _ if this method is defined in a class, the return value of this method is output when such an object is printed.

_ Getitem _ when a dictionary attribute member is defined in the class, you can obtain

_ Setitem _ set to modify Dictionary data in the class

_ Delitem _ Delete Dictionary data in the class

_ Metalass _ indicates who will instantiate and create the class.

_ New _ trigger _ init _ create an instance

1 #! Usr/bin/env python 2 #-*-coding: UTF-8-*-3 # Author calmyan 4 5 from lib. ss import a 6 # example class dog 7 class doges (object): 8 "class description" 9 def _ init _ (self, name, food): 10 self. name = name11 self. food = food12 self. data ={}# define a class dictionary 13 def _ call _ (self, * args, ** kwargs ): #14 print (* args) 15 def _ str _ (self): # default output return value 16 return self. name17 def _ getitem _ (self): # You can obtain the dictionary of the Class 18 return self. data19 def _ setitem _ (self, key, value): # You can set the class's dictionary 20 self. data [key] = value21 def _ delitem _ (self, key): # You can delete the dictionary content of the Class 22 del self. data [key] 23 dog = doges ('xxx', 'II') 24 print (dog. _ doc _) 25 B = a () 26 print (B. _ module _) # module 27 print (dog. _ class _) # What is the class of the object in the current operation 28 dog ('000000') #29 print (doges. _ dict _) # view the member classes of a class or object, print only the members of the class, and do not print 30 print (dog. _ dict _) # view the Member objects of a class or object, print only the members of the object, and do not print 31 print (dog) members of the class) # print the return value of _ str _ 32 print (dog. _ str _ () # print the returned value 33 34 dog ['1'] = 1000 # Trigger. _ setitem _ () 35 dog ['2'] = 1000 # Trigger. _ setitem _ () 36 print (dog. _ getitem _ () 37 print (dog. _ delitem _ ('1') # Delete the 38 print (dog. _ getitem _ () 39 40 # special method for setting classes 41 def func (self): 42 print ('Hello word % s' % self. name) 43 print () 44 45 def _ init _ (self, name, age): 46 self. name = name47 self. age = age48 # type parameter 1: class name 2. class base class 3. class member, Dictionary format 49 CAT = type ('cat', (object,), {'func': func, '_ init _' :__ init __}) 50 51 cat = CAT ('miaomiao ', 3) 52 cat. func () 53 print (cat. name, cat. age)

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Reflection: Call methods in an object using a string

1 #! Usr/bin/env python 2 #-*-coding: UTF-8-*-3 # Author calmyan 4 # reflection 5 6 # define a new method 7 def bulk (self ): 8 print ("% s is talking .... "% self. name) 9 10 class DOG (object): 11 def _ init _ (self, name): 12 self. name = name13 def eat (self, food): 14 print ('% s is eating % s' % (self. name, food) 15 16 d = DOG ('one dog') 17 18 stres = input ('method :'). strip () # manually input method 19 20 if hasattr (d, stres): # Whether 21 func = getattr (d, stres) exists by using the method in the string reflection object) # Call this method 22 func ("bone") # Run Method 23 else: 24 setattr (d, stres, bulk) # Add a method to the object and return a memory address 25 getattr (d, stres) (d) #26 # d added to call this method. talk (d) 27 # Attribute Modification 28 stres1 = input ('attribute :'). strip () # manually enter the attribute 29 if hasattr (d, stres1): # if 30 attr = getattr (d, stres1) already exists # Call 31 a = input ('re-assigned value: '). strip () 32 setattr (d, stres1, a) 33 print (getattr (d, stres1) 34 else: 35 a = input ('new value :'). strip () 36 setattr (d, stres1, a) # Add an attribute to the object, and assign a value to return the value of this attribute 37 print (stres1) 38 print (getattr (d, stres1 )) 39 40 print (d. _ dict _) 41 dela = input ('delete attribute :'). strip () 42 43 if hasattr (d, dela): # if 44 delattr (d, dela) already exists # Delete 45 print ('deleted successfully ') 46 47 print (d. _ dict __)

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