我是 Python 的新手，我的代码有问题，我正在使用函数中的 if 来计算蔬菜水果商的计算器，当输入三个正在购买的苹果时，总计为 £ 0 应该是 £3.90
total = 0
print "Welcome to the green grocers, what would you like?"
print "1. Apples"
print "2: Bananas"
print "3. Oranges"
print "4. Total"
fruit = raw_input("What would you like?")
if "1" in fruit:
q = input("How many?")
total + (q*1.3)
fruit = raw_input("What would you like?")
if "2" in fruit:
g = input("How many?")
total + (g*1.5)
fruit = raw_input("What would you like?")
if "3" in fruit:
l = input("How many?")
total = (l*1.6)
fruit = raw_input("What would you like?")
if "4" in fruit:
print "Your total is £", total
请您参考如下方法:
你需要:
total = total + (q*1.3)
或:
total += (q*1.3)
整数是不可变的，只是执行 total + (q*1.3) 不会影响 total，它只是返回一个新的整数。
>>> x = 1
>>> x + 2 # Simply returns a new value, doesn't affects `x`
3
>>> x # `x` is still unchanged
1
>>> x += 1 # Assign the new value back to `x`
>>> x # `x` is now updated.
2
