Python如果以利夫其他政治家

Question

我正试图用python创建一个计算运费的程序。

但是，我无法将程序运行到它正常工作的位置。

我的总数是6美元，加拿大是8美元。我好像不能通过。

total = raw_input('What is the total amount for your online shopping?')
country = raw_input('Shipping within the US or Canada?')

if country == "US":
    if total <= "50":
        print "Shipping Costs $6.00"
    elif total <= "100":
            print "Shipping Costs $9.00"
    elif total <= "150":
            print "Shipping Costs $12.00"
    else:
        print "FREE"

if country == "Canada":
    if total <= "50":
        print "Shipping Costs $8.00"
    elif total <= "100":
        print "Shipping Costs $12.00"
    elif total <= "150":
        print "Shipping Costs $15.00"
    else:
        print "FREE"

Answer 1

1. 您应该从原始输入中获取整数，而不是字符串。使用int()。
2. 比较值，如50，100，150。。。也应该是integer。

下面是固定代码。

total = int(raw_input('What is the total amount for your online shopping?'))
country = raw_input('Shipping within the US or Canada?')

if country == "US":
    if total <= 50:
        print "Shipping Costs $6.00"
    elif total <= 100:
        print "Shipping Costs $9.00"   # improved indentation
    elif total <= 150:
        print "Shipping Costs $12.00"  # improved indentation
    else:
        print "FREE"

if country == "Canada":
    if total <= 50:
        print "Shipping Costs $8.00"
    elif total <= 100:
        print "Shipping Costs $12.00"
    elif total <= 150:
        print "Shipping Costs $15.00"
    else:
        print "FREE"

Answer 2

不能用数字比较字符串。而是先转换为int，然后比较。

例如：

if int(total) < 50

避免重复的变量也会有帮助。

Answer 3

当你比较字符串时，它是按字典顺序排列的，就像在电话簿中一样。例如：

"a" < "b"：真
"bill" < "bob"：真
"100" < "3"：真

如果你想按照我们计算数字的顺序来比较数字，你需要使用int类型。

total = int(raw_input('What is the total amount for your online shopping?'))

然后将代码中的所有字符串文本（如"50"）更改为整数文本（如50）。