python将列表中的字符串转换为int和float [英] python converting strings in list to ints and floats

问题描述

如果要提供以下列表:

lst = ['3', '7', 'foo', '2.6', 'bar', '8.9']

我将如何将所有可能的项目相应地转换为int或float以获得

how would I convert all possible items into either ints or floats accordingly, to get

lst = [3, 7, 'foo', 2.6, 'bar', 8.9]

提前谢谢.

推荐答案

环顾每个项目并尝试进行转换.如果转换失败，则说明它不可转换.

Loop over each item and make an attempt to convert. If the conversion fail then you know it's not convertible.

def tryconvert(s):
    try:
        return int(s)
    except ValueError:
        try:
            return float(s)
        except ValueError:
            return s

lst = ['3', '7', 'foo', '2.6', 'bar', '8.9']
newlst = [tryconvert(i) for i in lst]
print(newlst)

输出:

[3, 7, 'foo', 2.6, 'bar', 8.9]

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