Question

我试图解决我的问题好几个小时，但不知怎的，我没有得到正确的解决方案。我有一个pandas数据框，其中包含一列日期，而这些日期又作为每行的列表存储。

df['date']=pd.to_datetime(df["date"])

给我错误：不可用的类型：'list'

我的数据框如下所示：

0    [February 28, 2013 Thursday]
1       [November 2, 2012 Friday]
2         [July 31, 2012 Tuesday]
3         [May 10, 2012 Thursday]
4       [June 23, 2004 Wednesday]

因此，每一行都是一个列表，但每个列表只包含一个字符串。我想将每行中的这一个字符串转换为数据帧中的日期时间格式（就像02-28-2013），以便我可以执行日期操作。

如何以能够执行pd.to_datetime命令的方式转换列？

非常感谢!!

Answer 1

我创建我的DataFrame：

Option Explicit

' The following code adapted from: https://stackoverflow.com/questions/13465709/repeating-microsoft-word-vba-until-no-search-results-found
Sub SearchFN()
    Dim iCount  As Integer
    Dim lStart  As Long
    'Always start at the top of the document
    Selection.HomeKey Unit:=wdStory

    'find a footnote to kick it off
    With Selection.Find
        .ClearFormatting
        .Text = "[nm]>"
        .Replacement.Text = ""
        .Forward = True
        .Wrap = wdFindContinue
        .Format = False
        .MatchCase = False
        .MatchWholeWord = False
        .MatchKashida = False
        .MatchDiacritics = False
        .MatchAlefHamza = False
        .MatchControl = False
        .MatchByte = False
        .MatchAllWordForms = False
        .MatchSoundsLike = False
        .MatchFuzzy = False
        .MatchWildcards = True
        .Execute
    End With

    'Jump back to the start of the document.
    Selection.HomeKey Unit:=wdStory

    'If we find one then we can set off a loop to keep checking
    'I always put a counter in to avoid endless loops for one reason or another
    Do While Selection.Find.Found = True And iCount < 2000
        iCount = iCount + 1

        Selection.Find.Execute

        'On the last loop you'll not find a result so check here
        If Selection.Find.Found Then
            ' Exit if we start back at the beginning
            If Selection.Start < lStart Then
                Exit Do
            End If

            'Reset the find parameters
            With Selection.Find
                .ClearFormatting
                .Text = "[nm]>"
                If Selection.Text = "m" Then
                    Debug.Print "found 'm' at position: " & Selection.Start
                    Selection.Text = "n"
                ElseIf Selection.Text = "n" Then
                    Debug.Print "found 'n' at position: " & Selection.Start
                    Selection.Text = "m"
                End If
                lStart = Selection.Start
'                .Replacement.Text = ""
                .Forward = True
                .Wrap = wdFindContinue
                .Format = False
                .MatchCase = False
                .MatchWholeWord = False
                .MatchKashida = False
                .MatchDiacritics = False
                .MatchAlefHamza = False
                .MatchControl = False
                .MatchByte = False
                .MatchAllWordForms = False
                .MatchSoundsLike = False
                .MatchFuzzy = False
                .MatchWildcards = True
            End With
        End If
    Loop
End Sub

我曾经写过一些随机日期，但它也是带有列表的大熊猫。

import pandas as pd
df = pd.DataFrame(columns=['date'])
df['date']=pd.to_datetime(df["date"]) 
df.date=[['01-01-2013'], ['2-2-2015'], ['July 31, 2012']]

您必须访问列表中的元素，因此只需使用 lambda函数

>>> df.date
0       [01-01-2013]
1         [2-2-2015]
2    [July 31, 2012]

对于列/格式的所有行，使用pd.to_datetime作为列/ pandas.series

1 个答案: