Python 3+：While循環繼續要求用戶輸入費用，即使用戶輸入了停止循環的按鈕。

Question

def getExpenses():
    userExpense = 0
    totalExpenses = 0
    moreExpenses = ""
    while moreExpenses != "y":
        userExpense = float(input("Enter an expense: "))
        totalExpenses = totalExpenses + userExpense
        moreExpenses = input("Do you have more expenses? Type y" +\
                             " to input more expenses, or any key for no: ")

    return totalExpenses

編輯：我能夠使它遍歷整個循環，但是現在代碼始終通過詢問“輸入費用”的方式運行，無論按下哪個按鈕。

如果需要完整的代碼，則下面是預先的代碼序列：

##---Initializing Variable----------------------------------------------------------------------#
#-----------------------------------------------------------------------------------------------#
monthlyIncome=0
monthlyExpenses=0
totalExpenses=0

##---Introductory Statement: Welcome to the Program---------------------------------------------#
#-----------------------------------------------------------------------------------------------#
def intro():
    print("\n".join(["---------------------------------------------------------",
              "Hello and Welcome to the Budget Analyzer",
              "Get ready to find out how much money you'll have left $$$",
              "---------------------------------------------------------"]))
    return

##---The monthlyIncome mod. gets user input for income/mth to compare against expenses----------#
#-----------------------------------------------------------------------------------------------#
def getIncome(): 
    monthlyIncome=float(input("Please enter the amount of money you'll have for the month: "))
    return monthlyIncome

這是主要模塊-我仍在嘗試調試問題所在，因此尚未完成程序的各個部分：

#---Run main module-----------------------------------------------------------------------------#
def main():
    intro()
    getIncome()
    getExpenses(monthlyIncome)

Answer 1

您的代碼有效，但可能與您的預期不符：

def getExpenses():
    userExpense = 0
    totalExpenses = 0
    moreExpenses = ""
    while moreExpenses != "y":
        userExpense = float(input("Enter an expense: "))
        totalExpenses = totalExpenses + userExpense
        moreExpenses = input("Do you have more expenses? Type y" +\
                             " to input more expenses, or any key for no: ")

    return totalExpenses

為了停止循環，請按“ y”。

因此，就此而言，它的作用完全符合錫罐上的要求。 但是，這有點不合邏輯：

系統會提示您“ do you have more expenses ”

如果你回答“ y ”（= YES）停止......所以你應該改變!=到=和預設moreExpenses變量y循環之前：

def getExpenses():
    userExpense = 0
    totalExpenses = 0
    moreExpenses = "y"
    while moreExpenses == "y":
        userExpense = float(input("Enter an expense: "))
        totalExpenses = totalExpenses + userExpense
        moreExpenses = input("Do you have more expenses? Type y" +\
                             " to input more expenses, or any key for no: ")

    return totalExpenses