Intermediate - The Quiz Project & the Benefit of OOP

Goal: what we will make by the end of the day

How to create your own Class in Python

1. Naming convention

   1. https://en.wikipedia.org/wiki/Naming_convention_(programming)
   2. Class naming rule: PascalCase: 第一字母大寫, 其餘複合字母第一個字母都大寫 (Most programming language)
   3. Method or Attribute naming rule: camelCase: 第一字母小寫, 其餘複合字母第一個字母都大寫 (like Java )
   4. Class is a Blueprint that contains attribute and method
   5. Method or Attribute naming rule: snake_case (like Python, c, c++, Java script)
   6. Python naming Styles:

   補充:

   How to Write Beautiful Python Code With PEP 8 - Real Python

   

2. Class initialize

   1. to set(variables, counters, switches, etc.) to their starting values at the beginning of a program or subprogram.
   2. to clear (internal memory, a disk, etc.) of previous data in preparation for use.

3. Working with Attributes : Class Constructions and the __ init __ () function

   #initialize attributes

   1. be invoked every time you create a new object from this class
   2. def __ init __ (self):
   3. def __ init __(self, attribute):

   class User:
   		def __init__(self,user_id, username):
   				self.id = user_id
   				self.username = username
   				self.follower = 0 #default value
   
   user_1 = User("001", "Brad")
   print(user_1.username)
   

   1. Adding Methods to a Class

class User:
		def __init__(self,user_id, username):
				self.id = user_id
				self.username = username
				self.follower = 0 #default value
				self.following = 0

    def follow(self, user):
				user.followers +=1
				self.following +=1

user_1 = User("001", "Brad")
user_2 = User("002", "Jack")

user_1.follow(user_2)
print(user_1.followers)
print(user_1.following)
print(user_2.followers)
print(user_2.following)

#result:
0
1
1
0

補充: How to Write Beautiful Python Code With PEP 8

How to Write Beautiful Python Code With PEP 8 - Real Python

補充:

[Python物件導向]淺談Python類別(Class)

The Unified Modeling Language User Guide