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如何在python数据帧中将合并数据从单元格提取到其行中？

python pandas dataframe

如何在python数据帧中将合并数据从单元格提取到其行中？,python,pandas,dataframe,data-cleaning,Python,Pandas,Dataframe,Data Cleaning,我有一个如下所示的数据框： +---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+ | | Date

我有一个如下所示的数据框：

+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
|   | Date                                                                                 | Professional  | Description                                |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 0 | 2019-12-19 00:00:00                                                                  | Katie Cool    | Travel to Space ...                        |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 1 | 2019-12-20 00:00:00                                                                  | Jenn Blossoms | Review stuff; prepare cancellations of ... |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 2 | 2019-12-27 00:00:00                                                                  | Jenn Blossoms | Review lots of stuff/o...                  |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 3 | 2019-12-27 00:00:00                                                                  | Jenn Blossoms | Draft email to world leader...             |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 4 | 2019-12-30 00:00:00                                                                  | Jenn Blossoms | Review this thing.                         |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 5 | 12-30-2019 Jenn Blossoms Telephone   Call   to   A.   Bell   return   her   multiple | NaN           | NaN                                        |
|   | voicemails.                                                                          |               |                                            |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+

+---+---------------------+---------------+-------------------------------------------------------------+
|   | Date                | Professional  | Description                                                 |
+---+---------------------+---------------+-------------------------------------------------------------+
| 0 | 2019-12-19 00:00:00 | Katie Cool    | Travel to Space ...                                         |
+---+---------------------+---------------+-------------------------------------------------------------+
| 1 | 2019-12-20 00:00:00 | Jenn Blossoms | Review stuff; prepare cancellations of ...                  |
+---+---------------------+---------------+-------------------------------------------------------------+
| 2 | 2019-12-27 00:00:00 | Jenn Blossoms | Review lots of stuff/o...                                   |
+---+---------------------+---------------+-------------------------------------------------------------+
| 3 | 2019-12-27 00:00:00 | Jenn Blossoms | Draft email to world leader...                              |
+---+---------------------+---------------+-------------------------------------------------------------+
| 4 | 2019-12-30 00:00:00 | Jenn Blossoms | Review this thing.                                          |
+---+---------------------+---------------+-------------------------------------------------------------+
| 5 | 12-30-2019          | Jenn Blossoms | Telephone   Call   to   A.   Bell   return   her   multiple |
|   |                     |               | voicemails.                                                 |
+---+---------------------+---------------+-------------------------------------------------------------+

+---+---------------------+---------------+--------------------------------------------+
|   | Date                | Professional  | Description                                |
+---+---------------------+---------------+--------------------------------------------+
| 0 | 2019-12-19 00:00:00 | Katie Cool    | Travel to Space ...                        |
+---+---------------------+---------------+--------------------------------------------+
| 1 | 2019-12-20 00:00:00 | Jenn Blossoms | Review stuff; prepare cancellations of ... |
+---+---------------------+---------------+--------------------------------------------+
| 2 | 2019-12-27 00:00:00 | Jenn Blossoms | Review lots of stuff/o...                  |
+---+---------------------+---------------+--------------------------------------------+
| 3 | 2019-12-27 00:00:00 | Jenn Blossoms | Draft email to world leader...             |
+---+---------------------+---------------+--------------------------------------------+
| 4 | 2019-12-30 00:00:00 | Jenn Blossoms | Review this thing.                         |
+---+---------------------+---------------+--------------------------------------------+
| 5 | 12-30-2019          | JennBlossoms  |                                            |
+---+---------------------+---------------+--------------------------------------------+
我希望它看起来像这样：

+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
|   | Date                                                                                 | Professional  | Description                                |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 0 | 2019-12-19 00:00:00                                                                  | Katie Cool    | Travel to Space ...                        |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 1 | 2019-12-20 00:00:00                                                                  | Jenn Blossoms | Review stuff; prepare cancellations of ... |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 2 | 2019-12-27 00:00:00                                                                  | Jenn Blossoms | Review lots of stuff/o...                  |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 3 | 2019-12-27 00:00:00                                                                  | Jenn Blossoms | Draft email to world leader...             |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 4 | 2019-12-30 00:00:00                                                                  | Jenn Blossoms | Review this thing.                         |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 5 | 12-30-2019 Jenn Blossoms Telephone   Call   to   A.   Bell   return   her   multiple | NaN           | NaN                                        |
|   | voicemails.                                                                          |               |                                            |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+

+---+---------------------+---------------+-------------------------------------------------------------+
|   | Date                | Professional  | Description                                                 |
+---+---------------------+---------------+-------------------------------------------------------------+
| 0 | 2019-12-19 00:00:00 | Katie Cool    | Travel to Space ...                                         |
+---+---------------------+---------------+-------------------------------------------------------------+
| 1 | 2019-12-20 00:00:00 | Jenn Blossoms | Review stuff; prepare cancellations of ...                  |
+---+---------------------+---------------+-------------------------------------------------------------+
| 2 | 2019-12-27 00:00:00 | Jenn Blossoms | Review lots of stuff/o...                                   |
+---+---------------------+---------------+-------------------------------------------------------------+
| 3 | 2019-12-27 00:00:00 | Jenn Blossoms | Draft email to world leader...                              |
+---+---------------------+---------------+-------------------------------------------------------------+
| 4 | 2019-12-30 00:00:00 | Jenn Blossoms | Review this thing.                                          |
+---+---------------------+---------------+-------------------------------------------------------------+
| 5 | 12-30-2019          | Jenn Blossoms | Telephone   Call   to   A.   Bell   return   her   multiple |
|   |                     |               | voicemails.                                                 |
+---+---------------------+---------------+-------------------------------------------------------------+

+---+---------------------+---------------+--------------------------------------------+
|   | Date                | Professional  | Description                                |
+---+---------------------+---------------+--------------------------------------------+
| 0 | 2019-12-19 00:00:00 | Katie Cool    | Travel to Space ...                        |
+---+---------------------+---------------+--------------------------------------------+
| 1 | 2019-12-20 00:00:00 | Jenn Blossoms | Review stuff; prepare cancellations of ... |
+---+---------------------+---------------+--------------------------------------------+
| 2 | 2019-12-27 00:00:00 | Jenn Blossoms | Review lots of stuff/o...                  |
+---+---------------------+---------------+--------------------------------------------+
| 3 | 2019-12-27 00:00:00 | Jenn Blossoms | Draft email to world leader...             |
+---+---------------------+---------------+--------------------------------------------+
| 4 | 2019-12-30 00:00:00 | Jenn Blossoms | Review this thing.                         |
+---+---------------------+---------------+--------------------------------------------+
| 5 | 12-30-2019          | JennBlossoms  |                                            |
+---+---------------------+---------------+--------------------------------------------+
@当我的问题不太具体且需要修改时，DataNearool提供了一个很好的答案

此后，我编辑了我的问题，并尝试编辑他的代码：

s = pd.to_datetime(dftopdata['Date'],errors='coerce').isna() 
# gives us the error rows to filter.

# split out our datetime column so we can extract the values.
date_err = (
    dftopdata[s]["Date"]
    .str.extract("\d{2}-\d{2}-\d{4}\s+(\w+.*)")[0]
    .str.split("\s", expand=True)
)

# set your values with `.loc` 
dftopdata.loc[s,'Professional'] = date_err[0] + date_err[1]
dftopdata.loc[s,'Description'] = date_err[2]
但是，当我运行上述代码时，我会得到一个如下所示的数据帧：

+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
|   | Date                                                                                 | Professional  | Description                                |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 0 | 2019-12-19 00:00:00                                                                  | Katie Cool    | Travel to Space ...                        |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 1 | 2019-12-20 00:00:00                                                                  | Jenn Blossoms | Review stuff; prepare cancellations of ... |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 2 | 2019-12-27 00:00:00                                                                  | Jenn Blossoms | Review lots of stuff/o...                  |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 3 | 2019-12-27 00:00:00                                                                  | Jenn Blossoms | Draft email to world leader...             |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 4 | 2019-12-30 00:00:00                                                                  | Jenn Blossoms | Review this thing.                         |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+
| 5 | 12-30-2019 Jenn Blossoms Telephone   Call   to   A.   Bell   return   her   multiple | NaN           | NaN                                        |
|   | voicemails.                                                                          |               |                                            |
+---+--------------------------------------------------------------------------------------+---------------+--------------------------------------------+

+---+---------------------+---------------+-------------------------------------------------------------+
|   | Date                | Professional  | Description                                                 |
+---+---------------------+---------------+-------------------------------------------------------------+
| 0 | 2019-12-19 00:00:00 | Katie Cool    | Travel to Space ...                                         |
+---+---------------------+---------------+-------------------------------------------------------------+
| 1 | 2019-12-20 00:00:00 | Jenn Blossoms | Review stuff; prepare cancellations of ...                  |
+---+---------------------+---------------+-------------------------------------------------------------+
| 2 | 2019-12-27 00:00:00 | Jenn Blossoms | Review lots of stuff/o...                                   |
+---+---------------------+---------------+-------------------------------------------------------------+
| 3 | 2019-12-27 00:00:00 | Jenn Blossoms | Draft email to world leader...                              |
+---+---------------------+---------------+-------------------------------------------------------------+
| 4 | 2019-12-30 00:00:00 | Jenn Blossoms | Review this thing.                                          |
+---+---------------------+---------------+-------------------------------------------------------------+
| 5 | 12-30-2019          | Jenn Blossoms | Telephone   Call   to   A.   Bell   return   her   multiple |
|   |                     |               | voicemails.                                                 |
+---+---------------------+---------------+-------------------------------------------------------------+

+---+---------------------+---------------+--------------------------------------------+
|   | Date                | Professional  | Description                                |
+---+---------------------+---------------+--------------------------------------------+
| 0 | 2019-12-19 00:00:00 | Katie Cool    | Travel to Space ...                        |
+---+---------------------+---------------+--------------------------------------------+
| 1 | 2019-12-20 00:00:00 | Jenn Blossoms | Review stuff; prepare cancellations of ... |
+---+---------------------+---------------+--------------------------------------------+
| 2 | 2019-12-27 00:00:00 | Jenn Blossoms | Review lots of stuff/o...                  |
+---+---------------------+---------------+--------------------------------------------+
| 3 | 2019-12-27 00:00:00 | Jenn Blossoms | Draft email to world leader...             |
+---+---------------------+---------------+--------------------------------------------+
| 4 | 2019-12-30 00:00:00 | Jenn Blossoms | Review this thing.                         |
+---+---------------------+---------------+--------------------------------------------+
| 5 | 12-30-2019          | JennBlossoms  |                                            |
+---+---------------------+---------------+--------------------------------------------+
我还遇到了这样的错误：试图在数据帧的切片副本上设置一个值。
尝试改用.loc[row\u indexer，col\u indexer]=value

好的，因为您的错误是一致的，我们可以使用regex和
.loc
过滤来提取您的值

不幸的是，我在这里没有找到减少代码的方法（不编写函数，但我很懒）

编辑：

这似乎是一个解决问题的好计划。到目前为止，您能发布您尝试的代码吗？错误是否一致？日期列格式不正确是否意味着您在
col3
中有错误？@datanovel是的，这是完全正确的。@JuanEstevez我实际上仍然挂在步骤1上。您真的应该为此提出一个新问题，因为它一点也不相似。为您编辑。