[Python][중급] 연습 문제 _예외

📌 파이썬 연습문제 [예외]

📋예외처리를 이용한 산술연산 프로그램

def add(n1, n2):
    try:
        n1 = float(n1)
        n2 = float(n2)
        print(f'{n1} + {n2} : {n1 + n2}')
    except:
        print(f'숫자만 입력하세요')


def sub(n1, n2):
    try:
        n1 = float(n1)
        n2 = float(n2)
        print(f'{n1} - {n2} : {n1 - n2}')
    except:
        print(f'숫자만 입력하세요')


def mul(n1, n2):
    try:
        n1 = float(n1)
        n2 = float(n2)
        print(f'{n1} * {n2} : {n1 * n2}')
    except:
        print(f'숫자만 입력하세요')


def div(n1, n2):
    try:
        n1 = float(n1)
        n2 = float(n2)
        # if n2 == 0:
        #     print(f'0으로 나눌 수 없습니다')
        #     return
        # else:
        #     print(f'{n1} / {n2} : {n1 / n2}')
        print(f'{n1} / {n2} : {n1 / n2}')

    except ZeroDivisionError:
        print(f'0으로 나눌 수 없습니다.')
    except:
        print(f'숫자만 입력하세요')


def mod(n1, n2):
    try:
        n1 = float(n1)
        n2 = float(n2)
        if n2 == 0:
            print(f'0으로 나눌 수 없습니다')
            return
        else:
            print(f'{n1} % {n2} : {n1 % n2}')

    except:
        print(f'숫자만 입력하세요')


def flo(n1, n2):
    try:
        n1 = float(n1)
        n2 = float(n2)
        if n2 == 0:
            print(f'0으로 나눌 수 없습니다')
            return
        else:
            print(f'{n1} // {n2} : {n1 // n2}')

    except:
        print(f'숫자만 입력하세요')


def exp(n1, n2):
    try:
        n1 = float(n1)
        n2 = float(n2)
        print(f'{n1} ** {n2} : {n1 ** n2}')
    except:
        print(f'숫자만 입력하세요')


---------------------------------------------------

💡main

print('-' * 30)

while True:

    try:
        operate = int(input('1.덧셈 \t 2.뺄셈 \t 3.곱셈 \t 4.나눗셈 \t 5.나머지 \t 6.몫 \t 7.제곱승 \t 8.종료 : '))
    except:
        print('다시 입력하세요.')
        continue

    if operate == 8:
        print('Bye~')
        break

    n1 = input('첫 번째 숫자 입력 : ')
    n2 = input('두 번째 숫자 입력 : ')

    if operate == 1:
        add(n1, n2)
    elif operate == 2:
        sub(n1, n2)
    elif operate == 3:
        mul(n1, n2)
    elif operate == 4:
        div(n1, n2)
    elif operate == 5:
        mod(n1, n2)
    elif operate == 6:
        flo(n1, n2)
    elif operate == 7:
        exp(n1, n2)
    else:
        print('다시 입력해주세요')

📋 1부터 1000까지의 소수인 난수 10개를 생성하되,소수가 아니면 예외가 발생

import random

💡예외 NotPrimeException

class NotPrimeException(Exception):
    def __init__(self, n):
        super().__init__(f'{n} is not prime number.')

💡예외 PrimeException

class PrimeException(Exception):
    def __init__(self, n):
        super().__init__(f'{n} is prime number.')


---------------------------------------------------

💡main

def isPrime(number):
    isPrime = True

    for i in range(2, number + 1):
        if number % i == 0 and i != number:
            isPrime = False

    if isPrime:
        raise PrimeException(number)
    else:
        raise NotPrimeException(number)


rands = random.sample(range(1, 1000), 10)  # 난수 10개 생성
# rands = [2, 3, 17, 19, 20, 47, 34]
primes = []

for prime in rands:
    try:
        isPrime(prime)
    except NotPrimeException as e:
        print(e)
        continue
    except PrimeException as e:
        print(e)
        primes.append(prime)

print(f'Random Number : {rands}')
print(f'Prime Number : {primes}')

📋총 구매 내역 프로그램

items = {'딸기': 2000, '바나나': 1500, '귤': 500, '메론': 3000, '사과': 1300}
errors = {}

total = 0
cnt = 0
for key in items.keys():
    try:
        cnt = input(f'{key} 구매 개수 : ')
        total += (int(cnt) * items[key])
    except Exception as e:
        errors[key] = cnt
      #  print(e)
        continue

print('-' * 30)
print(f'총 구매 금액 : {total}원')
print('-' * 12, '미결제 항목', '-' * 12)

for k in errors:
    print(f'상품 : {k} | 구매 개수 : {errors[k]}')

📋 회원가입 프로그램

💡예외 DataEmptyException

class DataEmptyException(Exception):
    def __init__(self, val):
        super().__init__(f'{val} is empty')

💡클래스 Member

class Member:
    def __init__(self, name, mail, pw, address, phone):
        self.name = name
        self.mail = mail
        self.pw = pw
        self.address = address
        self.phone = phone
        print('Membership completed!!')

    def printMemberInfo(self):
        print(f'name : {self.name}')
        print(f'mail : {self.mail}')
        print(f'pw : {self.pw}')
        print(f'address : {self.address}')
        print(f'phone : {self.phone}')

---------------------------------------------------

💡main

def registerMember():
    name = input('이름 입력 : ')
    mail = input('메일 입력 : ')
    pw = input('비밀번호 입력 : ')
    address = input('주소 입력 : ')
    phone = input('연락처 입력 : ')

    if name == '':
        raise DataEmptyException('name')
    if mail == '':
        raise DataEmptyException('mail')
    if pw == '':
        raise DataEmptyException('pw')
    if address == '':
        raise DataEmptyException('address')
    if phone == '':
        raise DataEmptyException('phone')

    mem = Member(name, mail, pw, address, phone)
    mem.printMemberInfo()


try:
    registerMember()
except DataEmptyException as e:
    print(e)

📋 은행 계좌 프로그램

import random

💡예외 BankException

class BankException(Exception):
    def __init__(self, balance, withdraw):
        super().__init__(f'잔고부족 ! 잔액 : {balance} 출금액 : {withdraw}')

💡클래스 Account

class Account:
    def __init__(self, name, bank):
        self.name = name
        self.bank = bank
        self.totalMoney = 0

        while True:
            self.no = random.randint(1000, 9999)
            if bank.isAccount(self.no):
                continue
            else:
                break

        self.printAccount()

    def printAccount(self):
        print('-' * 30)
        print(f'account_name : {self.name}')
        print(f'account_no : {self.no}')
        print(f'totalMoney : {self.totalMoney}원')
        print('-' * 30)
        
💡클래스 Bank

class Bank:
    def __init__(self):
        self.accounts = {}

    def addAccount(self, account):
        self.accounts[account.no] = account

    def isAccount(self, no):
        if no in self.accounts:
            return True
        else:
            return False

    def deposit(self, no, money):
        if no in self.accounts:
            account = self.accounts[no]
            account.totalMoney += money
        else:
            print('존재하지 않는 계좌입니다')

    def withdraw(self, no, money):
        if no in self.accounts:
            account = self.accounts[no]
            if account.totalMoney - money > 0:
                account.totalMoney -= money
            else:
                raise BankException(account.totalMoney, money)
        else:
            print('존재하지 않는 계좌입니다')


---------------------------------------------------

💡main

bank = Bank()
name = input('통장 계설을 위한 예금주 입력 : ')
account = Account(name, bank)
bank.addAccount(account)

while True:
    num = int(input('1. 입금, 2. 출금, 3. 종료 : '))
    if num == 1:
        money = int(input('입금액 입력 : '))
        bank.deposit(account.no, money)
        account.printAccount()
    if num == 2:
        try:
            money = int(input('출금액 입력 : '))
            bank.withdraw(account.no, money)
            account.printAccount()
        except BankException as e:
            print(e)
        finally:
            account.printAccount()
    if num == 3:
        print('종료')
        break