numpy.concatenate() 253rd; 38169Keyerror: 0 [How to Solve]

numpy.concatenate()

Official Documentation Link
Function Description.
Join a sequence of arrays along an existing axis.
Join a sequence of arrays along an existing axis.

Program error

KeyError Traceback (most recent call last)
F:\Anacondaaa\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.Int64HashTable.get_item()
pandas_libs\hashtable_class_helper.pxi in pandas._libs.hashtable.Int64HashTable.get_item()
KeyError: 0
The above exception was the direct cause of the following exception:
KeyError Traceback (most recent call last)
in
—-> 1 np.unique(np.concatenate(movie_type[‘类型’].map(lambda x: x.split(’/’))))
<array_function internals> in concatenate(*args, **kwargs)
F:\Anacondaaa\lib\site-packages\pandas\core\series.py in getitem(self, key)
851
852 elif key_is_scalar:
–> 853 return self._get_value(key)
854
855 if is_hashable(key):
F:\Anacondaaa\lib\site-packages\pandas\core\series.py in _get_value(self, label, takeable)
959
960 # Similar to Index.get_value, but we do not fall back to positional
–> 961 loc = self.index.get_loc(label)
962 return self.index._get_values_for_loc(self, loc, label)
963
F:\Anacondaaa\lib\site-packages\pandas\core\indexes\base.py in get_loc(self, key, method, tolerance)
3080 return self._engine.get_loc(casted_key)
3081 except KeyError as err:
-> 3082 raise KeyError(key) from err
3083
3084 if tolerance is not None:
KeyError: 0

Reasons and Suggestions
keyerror means no data, because np.concatenate itself is connected with the original index, and it doesn’t work because the original index is no longer continuous in the data cleaning process.
Reset the contiguous indexes or use other methods to join the list to achieve this effect.

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