如何基于从python中的字符串中提取的数值以降序对记录进行排序？

Question

I have a data set like this: 

 Surface Book 2 Review: How Microsoft Won My Five Stars At The Edinburgh Fringe | 0.5047957
 Remove the Power PC Care 2018 PUP | 0.44716716
 9 Months of Xbox Live (New or Returning Only, otherwise 7 months for $21) $23 | 0.42284298
 US probe into Microsoft software sales in Hungary | 0.42226338

我正在尝试根据|符号后的值对数据进行排序。因此，基本上我想根据具有最高价值的字符串显示整个字符串，并获得前10名。

 I tried doing this but I cannot figure out how to order by only that numerical value. 

 listnew = sorted(Calculatedvalues, key = lambda x : x[1], reverse = True)[:10]
 for item in listnew:
                 print (item)

我的输出是这样的：

３８ What is Thinking？ #Intelligence | 0.15786803
３８ What is Thinking？ #Intelligence | 0.15786803
８．３１ PF | 0.02431465
️ Hop on, Jerry. Here are 50 points. | 0.25864878

如果我们看到分数基本上比数据集中的分数低，我理解这不是正确的方法，并且我无法仅基于特定零件找到订购方法。

我提到了这些问题中提供的答案，但没有帮助。

Sort the top ten results

从下面提供的答案之一中：我尝试使用上述方法

Calculatedvalues.sort(key = lambda x: x.split("(")[1]))

但我收到此错误

list index out of range

Sort list of strings by a part of the string

Answer 1

您很亲密，但是您实际上并未在|上拆分行，您需要使用split将每一行转换为列表，然后根据列表的第二项对其进行排序，< / p>

请尝试一下

listnew = sorted(Calculatedvalues, key = lambda x: float(x.split("|")[-1]), reverse=True)[:10]
# output,
# ['Surface Book 2 Review: How Microsoft Won My Five Stars At The Edinburgh Fringe | 0.5047957\n', 'Remove the Power PC Care 2018 PUP | 0.44716716\n', '9 Months of Xbox Live (New or Returning Only, otherwise 7 months for $21) $23 | 0.42284298\n', 'US probe into Microsoft software sales in Hungary | 0.42226338']

Answer 2

如果您除以'|'然后转换为float

，您的列表将是正确的

listnew = sorted(old_list, key=lambda x: float(x.split('|')[1]))