我正在嘗試編寫一個簡單的程序，但我遇到了一個問題，即該程序最終沒有輸出給定的變量“tax”。def main(): # define and initialize constants and variables menu1 = 6 menu2 = 2.5 menu3 = 1.25 menu4 = 3.75 choose = total = 0 tax = total*0.06 # display welcome print("Welcome to Yum Yum Snack Bar!") try: while choose != 5: print("\nPlease choose from the following menu:") print("1) Personal Pizza $6.00") print("2) Pretzel $2.50") print("3) Chips $1.25") print("4) Hot Dog $3.75") print("5) Exit ") choose = int(input("\nEnter your choice here: ")) if choose == 1: total += menu1 elif choose == 2: total += menu2 elif choose == 3: total += menu3 elif choose == 4: total += menu4 elif choose == 5: continue else: print("Invalid choice. Must choose 1 – 5. Try again.") print("Current total: $",total) except: print("Invalid choice. Must choose 1 – 5. Try again.") main() print("Current total: $",total) print("Sales tax: $",tax) print("Total Bill: $",total+tax) print("Have a nice day!")main()
3 回答
守著星空守著你
TA貢獻1799條經驗 獲得超8個贊
當你初始化時tax，你給了它一個值，0因為total*0.06在那一點上等于零。
python 逐行進行，因此變量“ tax”在整個代碼中沒有更改其值，您只更改了“ total”。
所以要得到稅，你應該重新計算。
print("Current total: $",total)
tax=0.06*total
print("Sales tax: $",tax)
print("Total Bill: $",total+tax)
print("Have a nice day!")
慕少森
TA貢獻2019條經驗 獲得超9個贊
在這里，總計的值得到更新，但稅金是在檢查之前計算的，如下所示，因此稅金將tax = total*0.06在最初的地方輸出total=0 請試試這個：
def main():
# define and initialize constants and variables
menu1 = 6
menu2 = 2.5
menu3 = 1.25
menu4 = 3.75
choose = total = tax = 0
# display welcome
print("Welcome to Yum Yum Snack Bar!")
try:
while choose != 5:
print("\nPlease choose from the following menu:")
print("1) Personal Pizza $6.00")
print("2) Pretzel $2.50")
print("3) Chips $1.25")
print("4) Hot Dog $3.75")
print("5) Exit ")
choose = int(input("\nEnter your choice here: "))
if choose == 1:
total += menu1
elif choose == 2:
total += menu2
elif choose == 3:
total += menu3
elif choose == 4:
total += menu4
elif choose == 5:
continue
else:
print("Invalid choice. Must choose 1 – 5. Try again.")
print("Current total: $",total)
except:
print("Invalid choice. Must choose 1 – 5. Try again.")
tax = total*0.06
print("Current total: $",total)
print("Sales tax: $",tax)
print("Total Bill: $",total+tax)
print("Have a nice day!")
main()
嗶嗶one
TA貢獻1854條經驗 獲得超8個贊
我想你的問題已經解決了。也開始使用 python 字典而不是使用大量的 if else 語句
def main():
# define and initialize constants and variables
menu1 = 6
menu2 = 2.5
menu3 = 1.25
menu4 = 3.75
choose = total = 0
tax = total*0.06
# display welcome
print("Welcome to Yum Yum Snack Bar!")
try:
while choose != 5:
print("\nPlease choose from the following menu:")
print("1) Personal Pizza $6.00")
print("2) Pretzel $2.50")
print("3) Chips $1.25")
print("4) Hot Dog $3.75")
print("5) Exit ")
choose = int(input("\nEnter your choice here: "))
price_dict = {
1: menu1,
2: menu2,
3: menu3,
4: menu4
}
if 0 < choose < 5:
total += price_dict[choose]
else:
if choose == 5:
continue
else:
print("Invalid choice. Must choose 1 – 5. Try again.")
print("Current total: $",total)
except:
print("Invalid choice. Must choose 1 – 5. Try again.")
main()
tax = total*0.06
print("Current total: $",total)
print("Sales tax: $",tax)
print("Total Bill: $",total+tax)
print("Have a nice day!")
main()
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