TypeError：数据类型“类别”不理解

Question

当我尝试使用 dtype='category' 解决一些问题时，我得到了错误。我已经阅读了以前的答案并申请了，但没有一个答案能解决问题，因为它们都很老了 我的代码是，

train = pd.read_csv("C:/shubhamprojectwork/Kagglecomp/livecomp/My music recomment/train.csv/train.csv", dtype={'msno' : 'category','song_id' : 'category','source_system_tab' : 'category','source_screen_name' : 'category','source_type' : 'category','target' : np.uint8})

错误是

TypeError                                 Traceback (most recent call last)
<ipython-input-47-7d016844c8d7> in <module>()
      1 
      2 #train = pd.read_csv(data_path + 'train.csv', dtype={'msno' : category,'song_id' : 'category','source_system_tab' : 'category','source_screen_name' : 'category','source_type' : 'category','target' : np.uint8})
----> 3 train = pd.read_csv(data_path + 'train.csv', dtype={'msno' : 'category'})

C:\ProgramData\Anaconda3\lib\site-packages\pandas\io\parsers.py in parser_f(filepath_or_buffer, sep, delimiter, header, names, index_col, usecols, squeeze, prefix, mangle_dupe_cols, dtype, engine, converters, true_values, false_values, skipinitialspace, skiprows, skipfooter, nrows, na_values, keep_default_na, na_filter, verbose, skip_blank_lines, parse_dates, infer_datetime_format, keep_date_col, date_parser, dayfirst, iterator, chunksize, compression, thousands, decimal, lineterminator, quotechar, quoting, escapechar, comment, encoding, dialect, tupleize_cols, error_bad_lines, warn_bad_lines, skip_footer, doublequote, delim_whitespace, as_recarray, compact_ints, use_unsigned, low_memory, buffer_lines, memory_map, float_precision)
    560                     skip_blank_lines=skip_blank_lines)
    561 
--> 562         return _read(filepath_or_buffer, kwds)
    563 
    564     parser_f.__name__ = name

C:\ProgramData\Anaconda3\lib\site-packages\pandas\io\parsers.py in _read(filepath_or_buffer, kwds)
    313 
    314     # Create the parser.
--> 315     parser = TextFileReader(filepath_or_buffer, **kwds)
    316 
    317     if (nrows is not None) and (chunksize is not None):

C:\ProgramData\Anaconda3\lib\site-packages\pandas\io\parsers.py in __init__(self, f, engine, **kwds)
    643             self.options['has_index_names'] = kwds['has_index_names']
    644 
--> 645         self._make_engine(self.engine)
    646 
    647     def close(self):

C:\ProgramData\Anaconda3\lib\site-packages\pandas\io\parsers.py in _make_engine(self, engine)
    797     def _make_engine(self, engine='c'):
    798         if engine == 'c':
--> 799             self._engine = CParserWrapper(self.f, **self.options)
    800         else:
    801             if engine == 'python':

C:\ProgramData\Anaconda3\lib\site-packages\pandas\io\parsers.py in __init__(self, src, **kwds)
   1211         kwds['allow_leading_cols'] = self.index_col is not False
   1212 
-> 1213         self._reader = _parser.TextReader(src, **kwds)
   1214 
   1215         # XXX

pandas/parser.pyx in pandas.parser.TextReader.__cinit__ (pandas\parser.c:4625)()

TypeError: data type "category" not understood

Answer 1

train = pd.read_csv("C:/shubhamprojectwork/Kagglecomp/livecomp/My music recomment/train.csv/train.csv", dtype={'msno' : 'category','song_id' : 'category','source_system_tab' : 'category','source_screen_name' : 'category','source_type' : 'category','target' : np.uint8})

在引号中使用category，如图所示。