在字符串

Question

我有一个字符串作为我正在编写的代码的输入，并让字符串的示例为：

"12 inches  makes   1   foot"

我的目标是让我的代码遍历此字符串，然后拉出整数并添加它们。所以上面的字符串的输出将是13.我正在使用try，除了在这里，因为另一个示例输入字符串可能是“pi is 3.14”。

msg= "12    inches  makes   1   foot"

thesum = 0

s= msg.split()

for a in s:

    try:

        if a == int(a):
            a= int(a)
            thesum += a
        print (thesum)
    except ValueError as e:


        print("Value Error: no int present")

我做了上面的事情，我没有把它的值（如果它是一个int）添加到“thesum”。我怎样才能让它发挥作用？另外，我确实希望在try中使用它，除了格式以便我可以调用ValueError

Answer 1

a为str，int(a)为int（如果可能），因此a == int(a)永远不会相等。

只需添加int(a)的值，如果转换失败，则会引发ValueError。

以下代码应该有效。

msg= "12    inches  makes   1   foot"
thesum = 0
s= msg.split()
for a in s:
    try:
        thesum += int(a)
    except ValueError as e:
        print a
print thesum

Answer 2

无需检查字符串的相等性。实际上，只需在解释器中尝试'4' == 4即可。答案是False，因为字符串和整数永远不等同。只需将thesum += int(a)放入循环而不是if语句中。如果您不想try - except，请使用if a.isdigit():代替try:并完全取出except:：

for a in s:
    if a.isdigit():
        thesum += int(a)
        print(thesum)

一个好方法是几个内置组合的组合：

string = "12 inches makes 1 foot"
total = sum(map(int, filter(str.isdigit, string.split())))

filter()仅查找数字字符。然后我们将每个转换为map()的整数，并找到sum()的总数。

Answer 3

我喜欢“重新”和理解，以便更容易阅读：

import re
print(sum(int(a) for a in re.findall(r'\d+', '12 inches make 1 foot')))

然后你可以扩展浮点数的正则表达式等。

Answer 4

大多数早期的方法都打折第二个输入，即“pi是3.14”。尽管已经提出了解析整数解释的问题。它需要将数字处理为浮点数才能成功处理第二个输入。

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另一个问题