我有个疑问。以前,我用所学到的东西制作了我的第一个Python程序,这是关于自动售货机的系统的,但是主要的问题之一是,在进行条件处理时,它过于冗余,最终导致了代码的延长。因此,他们向我解释说,我应该定义函数并在未实现的情况下返回。
但是我的问题是,如何通过条件化来调用变量的值,特别是数字?
例子:
# -*- coding: utf-8 -*-
def select_ware(wares):
print(' '.join(wares))
while True:
selected = input("Elige un código: ")
if selected in wares:
print(f'El precio es de: {wares[selected]}\n')
break
else:
print("El código no existe, introduce un código válido")
return selected
def pay_ware(wares, selected):
money_needed = wares[selected]
money_paid = 0
while money_paid < money_needed:
while True:
try:
money_current = float(input("Introduce tu moneda: "))
break
except ValueError:
print('Please enter a number.')
money_paid += money_current
print(f'Paid ${money_paid}/${money_needed}')
if money_paid>{select_ware}: #This is the part where I want to substitute the value to call the variable.
print(f'Su cambio es ${money_paid-money_needed}')
return money_paid, money_needed
def main():
wares = {'A1': 6, 'A2': 7.5, 'A3': 8, 'A4': 10, 'A5': 11}
selected_ware = select_ware(wares)
pay_ware(wares, selected_ware)
if __name__ == "__main__":
main()
问题是这样的:
if money_paid>{select_ware}: #This is the part where I want to substitute the value to call the variable.
print(f'Su cambio es ${money_paid-money_needed}')
我如何实现它以避免为每个值(即,值)设置较长的条件'A1': 6, 'A2': 7.5, 'A3': 8, 'A4': 10, 'A5': 11
?谢谢阅读。问候。
你快完成了!只需根据需要修改{select where}。你还可以修改Try Exception语句,以避免在货币为浮点数之前停止程序:
def pay_ware(wares, selected):
money_needed = wares[selected]
money_paid = 0
valid_money_current = False # para chequear que el pago sea con monedas
while money_paid < money_needed:
while not valid_money_current:
money_current = float(input("Introduce tu dinero: "))
if type(money_current) is float:
valid_money_current = True # el pago es valido
else:
print('Please enter a number.')
money_paid += money_current
print(f'Paid ${money_paid}/${money_needed}')
if money_paid > money_needed: #This is the part where I want to substitute the value to call the variable.
print(f'Su cambio es ${money_paid-money_needed}')
return money_paid, money_needed
哦,我现在明白了,我没看到细节> _ <,非常感谢explian和技巧。