我正在嘗試制作一個預算程序，我需要對其進行編程，以便每當我運行代碼時我都可以將我那周賺的錢添加到總額中。我希望能夠存儲最新輸入的金額pay_this_week并將其添加到total每次運行代碼時。我應該制作pay_this_week一個列表并將其附加到總計中嗎？這是代碼：def money_earnt(): total = int() while True: try: pay_this_week = int(input("How much money did you earn this week? ")) break except ValueError: print("Oops! That was no valid number. Try again...") pay_this_week_message = "You've earnt ￡{0} this week!".format(pay_this_week) total = pay_this_week + total total_message = "You have earned ￡{0} in total!".format(total) print(pay_this_week_message) print(total_message)money_earnt()
2 回答
婷婷同學_
TA貢獻1844條經驗 獲得超8個贊
當程序運行時，它們使用的任何變量都存儲在內存中，每當您關閉程序時，內存就會丟失。如果您希望在運行程序時存儲數據，則需要將它們保存到文件中。
幸運的是，Python 有一些非常有用的函數可以做到這一點。
您的代碼看起來非常整潔并且可以正常工作，我們只需要添加文件讀取和寫入
首先，您需要使用讀取模式打開我們用來存儲總計的文件"r"
file = open("total.txt", "r") # open the file in read mode
data = file.readline() # read the line
total = int(data) # get the total as an int
然而，當你第一次運行程序時，這個文件還不存在（因為我們還沒有創建它），總數將為 0。我們可以使用一個塊try來捕獲這個文件，并使用模式創建一個新文件"w+"，這將如果同名文件不存在則創建一個文件
total = int()
try: # try open the file
file = open("total.txt", "r")
data = file.readline()
total = int(data)
except: # if file does not exist
file = open("total.txt", "w+") # create file
total = 0 # this is the first time we run this so total is 0
file.close() # close file for now
然后你可以運行你的代碼，在我們想要存儲新的總計之后，這次以寫入模式打開文件"w"，這將從文件中擦除舊的總計
file = open("total.txt", "w") # wipe the file and let us write to it
file.write(str(total)) # write the data
file.close() # close the file
現在，下次運行程序時，它將加載此總數并正確相加！
這就是全部內容，
def money_earnt():
total = int()
try: # try open the file
file = open("total.txt", "r")
data = file.readline()
total = int(data)
except: # if file does not exist
file = open("total.txt", "w+") # create file
total = 0
file.close() # close file for now
while True:
try:
pay_this_week = int(input("How much money did you earn this week? "))
break
except ValueError:
print("Oops! That was no valid number. Try again...")
pay_this_week_message = "You've earnt ￡{0} this week!".format(pay_this_week)
total = pay_this_week + total
total_message = "You have earned ￡{0} in total!".format(total)
print(pay_this_week_message)
print(total_message)
file = open("total.txt", "w") # wipe the file and let us write to it
file.write(str(total)) # write the data
file.close() # close the file
money_earnt()
有只小跳蛙
TA貢獻1824條經驗 獲得超8個贊
你已經快到了，不要放棄。2個主要錯誤：
break如果while你想讓它永遠持續下去就沒有必要在Python中，標識產生了所有的差異，只有標識的行才進入到while中，我猜你希望所有的行都在里面。
這是我的嘗試：
def money_earnt():
total = int()
while True:
try:
pay_this_week = int(input("How much money did you earn this week? "))
except ValueError:
print("Oops! That was no valid number. Try again...")
continue
pay_this_week_message = "You've earnt ￡{0} this week!".format(pay_this_week)
total = pay_this_week + total
total_message = "You have earned ￡{0} in total!".format(total)
print(pay_this_week_message)
print(total_message)
money_earnt()
我的輸出是：
How much money did you earn this week? 4
You've earnt ￡4 this week!
You have earned ￡4 in total!
How much money did you earn this week? 5
You've earnt ￡5 this week!
You have earned ￡9 in total!
How much money did you earn this week? 6
You've earnt ￡6 this week!
You have earned ￡15 in total!
How much money did you earn this week?
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