longer error msg for setting df with dict.values()

# for https://stackoverflow.com/q/66961614/1431750

KeyError                                  Traceback (most recent call last)
c:\program files\python38\lib\site-packages\pandas\core\indexes\base.py in get_loc(self, key, method, tolerance)
   3079             try:
-> 3080                 return self._engine.get_loc(casted_key)
   3081             except KeyError as err:

pandas\_libs\index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas\_libs\index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas\_libs\hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

pandas\_libs\hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

KeyError: dict_values(['first_column', 'second_column', 'third_column'])

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

KeyError                                  Traceback (most recent call last)
c:\program files\python38\lib\site-packages\pandas\core\generic.py in _set_item(self, key, value)
   3825         try:
-> 3826             loc = self._info_axis.get_loc(key)
   3827         except KeyError:

c:\program files\python38\lib\site-packages\pandas\core\indexes\base.py in get_loc(self, key, method, tolerance)
   3081             except KeyError as err:
-> 3082                 raise KeyError(key) from err
   3083

KeyError: dict_values(['first_column', 'second_column', 'third_column'])

During handling of the above exception, another exception occurred:

ValueError                                Traceback (most recent call last)
<ipython-input-29-31e2e9fe17fe> in <module>
----> 1 df[cols_dict.values()] = df[cols_dict.values()].applymap(lambda x: -1 if x % 2 == 0 else x ** 2)

c:\program files\python38\lib\site-packages\pandas\core\frame.py in __setitem__(self, key, value)
   3161         else:
   3162             # set column
-> 3163             self._set_item(key, value)
   3164
   3165     def _setitem_slice(self, key: slice, value):

c:\program files\python38\lib\site-packages\pandas\core\frame.py in _set_item(self, key, value)
   3241         self._ensure_valid_index(value)
   3242         value = self._sanitize_column(key, value)
-> 3243         NDFrame._set_item(self, key, value)
   3244
   3245         # check if we are modifying a copy

c:\program files\python38\lib\site-packages\pandas\core\generic.py in _set_item(self, key, value)
   3827         except KeyError:
   3828             # This item wasn't present, just insert at end
-> 3829             self._mgr.insert(len(self._info_axis), key, value)
   3830             return
   3831

c:\program files\python38\lib\site-packages\pandas\core\internals\managers.py in insert(self, loc, item, value, allow_duplicates)
   1201             value = safe_reshape(value, (1,) + value.shape)
   1202
-> 1203         block = make_block(values=value, ndim=self.ndim, placement=slice(loc, loc + 1))
   1204
   1205         for blkno, count in _fast_count_smallints(self.blknos[loc:]):

c:\program files\python38\lib\site-packages\pandas\core\internals\blocks.py in make_block(values, placement, klass, ndim, dtype)
   2730         values = DatetimeArray._simple_new(values, dtype=dtype)
   2731
-> 2732     return klass(values, ndim=ndim, placement=placement)
   2733
   2734

c:\program files\python38\lib\site-packages\pandas\core\internals\blocks.py in __init__(self, values, placement, ndim)
    140
    141         if self._validate_ndim and self.ndim and len(self.mgr_locs) != len(self.values):
--> 142             raise ValueError(
    143                 f"Wrong number of items passed {len(self.values)}, "
    144                 f"placement implies {len(self.mgr_locs)}"

ValueError: Wrong number of items passed 3, placement implies 1