Python 7 Levels, L7, Unit 72, File

Exercise 1:

file = open("a.txt","w")
#file.write("hello")
s = ["hello\n","world"]
file.writelines(s)
file.close()

Exercise 2:

'''try:
    file = open("a.txt","w")
    #file.write("hello")
    s = ["hello\n","world"]
    file.writelines(s)
except BaseException as e:
    print(e)
finally:
    file.close()'''

with open("a.txt","w") as file:
    file.write("hello")

Exercise 3:

with open("b.txt","r") as file:
    r1 = file.read()
    print(r1)

Exercise 4:

with open("c.txt","r") as file:
    while True:
        r1 = file.readline()
        if not r1:
            break
        else:
            print(r1,end = "")

with open("c.txt","r") as file:
    list01 = file.readlines()
for item in list01:
    print(item,end = "")

Exercise 5:

with open('cktn.jpg', 'rb') as f:
    with open('cktn_copy.jpg', 'wb') as w:
        for line in f.readlines():
            w.write(line)
print('Image duplicated successfully！')

Homework:

import easygui as g

card_money = []
with open("card_money.txt","r") as file:
    card_money  = file.readlines()
    
card1_num = "1001"
card1_pwd = "123456"
card1_money = int(card_money[0])
card2_num = "1002"
card2_pwd = "234567"
card2_money = int(card_money[1])
times = 0
while True:
    card = g.multpasswordbox("Please input card number and pin code",title = "Banking System",fields = ("Card Number","pin code"))
    money = 0
    flag = 0
    if card == [card1_num,card1_pwd]:
        money = card1_money
        flag = 1
        g.msgbox("Login Successfully",title = "Banking System")

    elif card == [card2_num,card2_pwd]:
        flag = 2
        money = card2_money
        g.msgbox("Login Successfully",title = "Banking System")
    else:
        times += 1
        if times == 3:
            g.msgbox("You have input wrong for 3 times. Please contact with bank admin.",title = "Banking System")
            pwd = ""
            while pwd != "888888":
                pwd = g.passwordbox("Please input Admin's password.",title = "Banking System")
                times = 0
        else:
            g.msgbox("Login failed. Please re-input.",title = "Banking System")
        continue
    while True:
        operation = g.buttonbox("Please pick your operation.",title = "Banking System", choices=("Deposit", "Withdraw", "Balance", "Quit"))
        if operation == "Quit":
            times = 0
            if flag == 1:
                card1_money = money
            elif flag == 2:
                card2_money = money
            with open("card_money.txt","w") as file:
                file.writelines(str(card1_money)+"\n"+str(card2_money))
            break
        elif operation == "Deposit":
            save_money = g.integerbox("Please input money deposit:",title = "Banking System", lowerbound=0, upperbound=1000000)
            money = money + save_money
            g.msgbox("Operation succeeds. Money deposit is " + str(save_money),title = "Banking System")
        elif operation == "Withdraw":
            get_money = g.integerbox("Please input money withdrew:",title = "Banking System", lowerbound=0, upperbound=1000000)
            if get_money > money:
                g.msgbox("Sorry, not enough money. Please re-try",title = "Banking System")
            else:
                money = money - get_money
                g.msgbox("Operation succeeds. Money withdrew is " + str(get_money),title = "Banking System")
        elif operation == "Balance":
            g.msgbox("Your balance is " + str(money),title = "Banking System")