데이터 엔지니어(아홉번째 이야기)

 

절차 vs OOP

 

Python의 type() 을 호출하여 클래스 확인 가능

 

클래스는 상태와 행동에 대한 정보를 포함

 

 

 

# Print the mystery employee's name
print(mystery.name)

# Print the mystery employee's salary
print(mystery.salary)

# Give the mystery employee a raise of $2500
mystery.give_raise(2500)

# Print the salary again
print(mystery.salary)

 

 

 

 

 

실습

# Include a set_name method
class Employee:
  
  def set_name(self, new_name):
    self.name = new_name
  
# Create an object emp of class Employee  
emp = Employee()

# Use set_name() on emp to set the name of emp to 'Korel Rossi'
emp.set_name('Korel Rossi')

# Print the name of emp
print(emp.name)

class Employee:
  
  def set_name(self, new_name):
    self.name = new_name
  
  # Add set_salary() method
  def set_salary(self, new_salary):
    self.salary = new_salary
  
  
# Create an object emp of class Employee  
emp = Employee()

# Use set_name to set the name of emp to 'Korel Rossi'
emp.set_name('Korel Rossi')

# Set the salary of emp to 50000
emp.set_salary(50000)

class Employee:
    def set_name(self, new_name):
        self.name = new_name

    def set_salary(self, new_salary):
        self.salary = new_salary 
  
emp = Employee()
emp.set_name('Korel Rossi')
emp.set_salary(50000)

# Print the salary attribute of emp
print(emp.salary)

# Increase salary of emp by 1500
emp.salary = emp.salary + 1500

# Print the salary attribute of emp again
print(emp.salary)

class Employee:
    def set_name(self, new_name):
        self.name = new_name

    def set_salary(self, new_salary):
        self.salary = new_salary 

    def give_raise(self, amount):
        self.salary = self.salary + amount

    # Add monthly_salary method that returns 1/12th of salary attribute
    def monthly_salary(self):
        return self.salary / 12
    
emp = Employee()
emp.set_name('Korel Rossi')
emp.set_salary(50000)

# Get monthly salary of emp and assign to mon_sal
mon_sal = emp.monthly_salary()

# Print mon_sal
print(mon_sal)

 

 

 

 

 

class Employee:
    # Create __init__() method
    def __init__(self, name, salary = 0):
        # Create the name and salary attributes
        self.name = name
        self.salary = salary
    
    # From the previous lesson
    def give_raise(self, amount):
        self.salary += amount

    def monthly_salary(self):
        return self.salary/12
        
emp = Employee("Korel Rossi")
print(emp.name)
print(emp.salary)

class Employee:
  
    def __init__(self, name, salary=0):
        self.name = name
        # Modify code below to check if salary is positive
        if salary > 0:
            self.salary = salary
        else:
            self.salary = 0
            print("Invalid salary!")
   
   # ...Other methods omitted for brevity ...
      
emp = Employee("Korel Rossi", -1000)
print(emp.name)
print(emp.salary)

# Import datetime from datetime
from datetime import datetime

class Employee:
    
    def __init__(self, name, salary=0):
        self.name = name
        if salary > 0:
          self.salary = salary
        else:
          self.salary = 0
          print("Invalid salary!")
          
        # Add the hire_date attribute and set it to today's date
        self.hire_date = datetime.today()
        
   # ...Other methods omitted for brevity ...
      
emp = Employee("Korel Rossi", -1000)
print(emp.name)
print(emp.salary)

 

 

 

Point 구현

# For use of np.sqrt
import numpy as np

class Point:
    """ A point on a 2D plane
    
   Attributes
    ----------
    x : float, default 0.0. The x coordinate of the point        
    y : float, default 0.0. The y coordinate of the point
    """
    def __init__(self, x=0.0, y=0.0):
      self.x = x
      self.y = y
      
    def distance_to_origin(self):
      """Calculate distance from the point to the origin (0,0)"""
      return np.sqrt(self.x ** 2 + self.y ** 2)
    
    def reflect(self, axis):
      """Reflect the point with respect to x or y axis."""
      if axis == "x":
        self.y = - self.y
      elif axis == "y":
        self.x = - self.x
      else:
        print("The argument axis only accepts values 'x' and 'y'!")

 

 

 

 

# Create a Player class
class Player:
    MAX_POSITION = 10
    
    def __init__(self):
      self.position = 0

# Print Player.MAX_POSITION  
print(Player.MAX_POSITION)   

# Create a player p and print its MAX_POSITITON
p = Player()
print(p.MAX_POSITION)

class Player:
    MAX_POSITION = 10
    
    def __init__(self):
        self.position = 0

    # Add a move() method with steps parameter     
    def move(self, steps):
        if self.position + steps < Player.MAX_POSITION:
           self.position = self.position + steps 
        else:
           self.position = Player.MAX_POSITION
    
    # This method provides a rudimentary visualization in the console    
    def draw(self):
        drawing = "-" * self.position + "|" +"-"*(Player.MAX_POSITION - self.position)
        print(drawing)

p = Player(); p.draw()
p.move(4); p.draw()
p.move(5); p.draw()
p.move(3); p.draw()