Python-如何仅将混合列表中的数字转换为浮点数? [英] Python - How to convert only numbers in a mixed list into float?

问题描述

我正在尝试学习Python，但遇到了问题，因此，如果我遇到类似问题:

I'm trying to learn Python and i have a problem, so if i have something like that:

data_l = ['data', '18.8', '17.9', '0.0']

我该怎么做?

data_l = ['data', 18.8, 18.9, 0.0]

推荐答案

您可以创建一个简单的实用程序函数，该函数可以将给定值转换为浮点数，或者按原样返回该值:

You could create a simple utility function that either converts the given value to a float if possible, or returns it as is:

def maybe_float(s):
    try:
        return float(s)
    except (ValueError, TypeError):
        return s

orig_list = ['data', '18', '17', '0']
the_list = [maybe_float(v) for v in orig_list]

请不要使用内置函数的名称和类型，例如list等作为变量名.

And please don't use names of builtin functions and types such as list etc. as variable names.

由于您的数据实际上具有结构性，而不是真正的字符串和数字混合列表，因此看来(str, float, float, float)的4元组更合适:

Since your data actually has structure instead of being a truly mixed list of strings and numbers, it seems a 4-tuple of (str, float, float, float) is more apt:

data_conv = (data_l[0], *(float(v) for v in data_l[1:]))

或在较旧的Python版本中

or in older Python versions

# You could also just convert each float separately since there are so few
data_conv = tuple([data_l[0]] + [float(v) for v in data_l[1:]]) 

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