Copy a column from one dataframe to another dataframe

[Led_Zeppelin]

I tried the simple command that you gave me:

df['machine_status'] = df1['machine_status']

Now df is the new dataframe and df1 is the old copied dataframe. I am trying to move the column named 'machine_status', from df1 to df and put it in the last column. The column is named 'machine_status' in both cases.

I got the following error:

Error:
KeyError                                  Traceback (most recent call last)
File ~\miniconda3\envs\pump-failure-pred\lib\site-packages\pandas\core\indexes\base.py:3621, in Index.get_loc(self, key, method, tolerance)
   3620 try:
-> 3621     return self._engine.get_loc(casted_key)
   3622 except KeyError as err:

File ~\miniconda3\envs\pump-failure-pred\lib\site-packages\pandas\_libs\index.pyx:136, in pandas._libs.index.IndexEngine.get_loc()

File ~\miniconda3\envs\pump-failure-pred\lib\site-packages\pandas\_libs\index.pyx:163, in pandas._libs.index.IndexEngine.get_loc()

File pandas\_libs\hashtable_class_helper.pxi:5198, in pandas._libs.hashtable.PyObjectHashTable.get_item()

File pandas\_libs\hashtable_class_helper.pxi:5206, in pandas._libs.hashtable.PyObjectHashTable.get_item()

KeyError: 'machine_status'

The above exception was the direct cause of the following exception:

KeyError                                  Traceback (most recent call last)
Input In [25], in <cell line: 1>()
----> 1 df['machine_status'] = df1['machine_status']

File ~\miniconda3\envs\pump-failure-pred\lib\site-packages\pandas\core\frame.py:3505, in DataFrame.__getitem__(self, key)
   3503 if self.columns.nlevels > 1:
   3504     return self._getitem_multilevel(key)
-> 3505 indexer = self.columns.get_loc(key)
   3506 if is_integer(indexer):
   3507     indexer = [indexer]

File ~\miniconda3\envs\pump-failure-pred\lib\site-packages\pandas\core\indexes\base.py:3623, in Index.get_loc(self, key, method, tolerance)
   3621     return self._engine.get_loc(casted_key)
   3622 except KeyError as err:
-> 3623     raise KeyError(key) from err
   3624 except TypeError:
   3625     # If we have a listlike key, _check_indexing_error will raise
   3626     #  InvalidIndexError. Otherwise we fall through and re-raise
   3627     #  the TypeError.
   3628     self._check_indexing_error(key)

KeyError: 'machine_status'

Where is the error? I think that I entered the python code correctly. The python interpreter says that I did not.

What is a key error?

Thanks in advance.

Respectfully,

LZ
.