게시 됨 업데이트 됨python3분안에 읽기 (약 483 단어)

python_basic_Exeption

python

Exception

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# /c/Users/brill/Desktop/PyThon_Function/venv/Scripts/python
# -*- coding : UTF-8

def error01():
    a=10
    a/0
    #ZeroDivisionError: division by zero

def error02():
    a= [1, 2, 3, 4, 5]
    a[10]
    #IndexError: list index out of range

def error03():
    a = 1000
    a + "Hello"
    #TypeError: unsupported operand type(s) for +: 'int' and 'str'

def error04():
    a=10
    a+b
    #NameError: name 'b' is not defined

if __name__ == "__main__":
    error01()
    error02()
    error03()
    error04()
    print("program is done")

Exeption의 종류

java 의 try catch 구문과 같음

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# /c/Users/brill/Desktop/PyThon_Function/venv/Scripts/python
# -*- coding : UTF-8

def try_func(x, idx):
    try:
        return 100/x[idx]
    except ZeroDivisionError:
        print("did't divide zero")
    except IndexError:
        print("not in range of Index")
    except TypeError:
        print("there is type Error")
    except NameError:
        print("it is not definated parameter")
    finally:
        print("무조건 실행됨")


def main():
    a = [50, 60, 0, 70]
    print(try_func(a,1))

    # Zero Division Error
    print(try_func(a,0))

    # Index Error
    print(try_func(a,5))

    # type Error
    print(try_func(a, "hi"))


if __name__ == "__main__":
    main()

어떻게던 프로그램이 돌아 갈 수 있도록
만들어 주는 것이 중요하다.



  • class 정리
  1. __init__ : set_name, set_id 해 주지 않고, 통합시켜주는 역할
  2. __eq__, __ne__ : 부등호 연산자
  3. 상속, 다형성(서로다른 클래스에서 공통으로 쓰는 함수)
  4. Exception
  5. class attribute / instance attribute / instance method 차이
  6. 추상 class (안배웠음)
  7. data incapsulation



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# /c/Users/brill/Desktop/PyThon_Function/venv/Scripts/python
# -*- coding : UTF-8

class SalaryExcept(ValueError): pass # 상속
class TipExept(SalaryExcept): pass # 상속

class Employee:

    MIN_SALARY = 30000
    MAX_Bonus = 20000

    def __init__(self, name, salary = 30000):
        self.name = name
        if salary< Employee.MIN_SALARY:
            raise SalaryExcept("급여가 너무 낮아요!")
        self.salary = salary

    def give_bonus(self, amount):
        if amount > Employee.MAX_Bonus:
            print("보너스가 너무 많아 ")
        elif self.salary + amount < Employee.MIN_SALARY :
            print("보너스 지급 후의 급여도 매우 낮다. ")
        else:
            self.salary += amount

if __name__ == "__main__":
    emp = Employee("YH", salary= 10000)

    try:
        emp.give_bonus(70000)
    except SalaryExcept:
        print("Error Salary")

    try:
        emp.give_bonus(-10000)
    except tipExcept:
        print("Error Tip")

여전히 Error가 나는 코드
나는 Exception 안됨

 게시 됨 업데이트 됨python3분안에 읽기 (약 523 단어)

python_basic_Bank

python

Bank _ 계좌 만들기

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# /c/Users/brill/Desktop/PyThon_Function/venv/Scripts/python
# -*- coding : UTF-8

class Human:

    def __init__(self, name):
        self.name = name


if __name__ == "__main__":
    human01 = Human(name="A")
    human02 = Human(name="A")

    print(human01 == human02)
    print("human 01 : ", human01)
    print("human 02 : ", human02)

False
human 01 : <__main__.Human object at 0x000001686E41CC10>
human 02 : <__main__.Human object at 0x000001686E41CE50>

저장되는 장소가 다르기 때문에 다르다.

Bank _ customer ID 확인하기

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# /c/Users/brill/Desktop/PyThon_Function/venv/Scripts/python
# -*- coding : UTF-8

class Bank:

    #instance attribute
    def __init__(self, cust_id, balance=0):
        self.balance = balance
        self.cust_id = cust_id

    #instance methode
    def withdraw(self, amount):
        self.balance -= amount

    def __eq__(self, other):
        print("__eq()__ is called")
        return self.cust_id == other.cust_id

if __name__ == "__main__":
    account01 = Bank(123, 1000)
    account02 = Bank(123, 1000)
    account03 = Bank(456, 1000)
    print(account01 == account02)
    print(account02 == account03)
    print(account01 == account03)

eq() is called
True
eq() is called
False
eq() is called
False



  • 부등호 연산자
    • != : ne()
    • >= : ge()
    • <= : le()
    • > : gt()
    • < : lt()

eq() 함수 사용하기

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# /c/Users/brill/Desktop/PyThon_Function/venv/Scripts/python
# -*- coding : UTF-8

class Bank:

    #instance attribute
    def __init__(self, cust_id, balance=0):
        self.balance, self.cust_id = balance, cust_id


    #instance methode
    def withdraw(self, amount):
        self.balance -= amount

    def __eq__(self, other):
        print("__eq()__ is called")
        return (self.cust_id == other.cust_id) and (type(self) == type(other))

class Phone:

    def __init__(self, cust_id):
        self.cust_id = cust_id

    def __eq__(self, other):
        return self.cust_id == other.cust_id


if __name__ == "__main__":
    account01 = Bank(1234)
    phone01 = Phone(1234)

    print(account01 == phone01)

eq() is called
False

eq를 불러와서 같은지 확인 할 수 있다.

접근기록, log 기록 확인하기

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# /c/Users/brill/Desktop/PyThon_Function/venv/Scripts/python
# -*- coding : UTF-8


class Bank:
    def __init__(self, cust_id, name, balance = 0):
        self.cust_id, self.name, self.balance = cust_id, name, balance

    def __str__(self):
        cust_str = """
        customer:
            cust_id : {cust_id}
            name : {name}
            balance : {balance}
        """.format(cust_id = self.cust_id, name = self.name, balance= self.balance)

        return cust_str

if __name__ == "__main__":
    bank_cust = Bank(123, "YH")
    print(bank_cust)

  • DB에 저장 되지 않지만, 로그 기록을 확인 할 수 있다.

str() and repr() 비교

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# /c/Users/brill/Desktop/PyThon_Function/venv/Scripts/python
# -*- coding : UTF-8


class Bank:
    def __init__(self, cust_id, name, balance = 0):
        self.cust_id, self.name, self.balance = cust_id, name, balance

    def __str__(self):
        cust_str = """
        customer:
            cust_id : {cust_id}
            name : {name}
            balance : {balance}
        """.format(cust_id = self.cust_id, name = self.name, balance= self.balance)

        return cust_str

    def __repr__(self):
        cust_str = "Bank({cust_id}, '{name}', {balance})".format(cust_id = self.cust_id, name = self.name, balance= self.balance)
        return cust_str

if __name__ == "__main__":
    bank_cust = Bank(123, "YH")
    print(str(bank_cust))
    print(repr(bank_cust))

difference of str() and repr()

 게시 됨 업데이트 됨init몇 초안에 읽기 (약 35 단어)

Making Category

---
title: "Making Category"
excerpt :"Credit card"
classes: wide
categories:
-init
tags:
-python
-title
-coding
last_modified_at: 2021-11-03
---

color 바꾸고 싶은에 안되네

https://www.color-hex.com/color/f4dcdc

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