pandas使用.astype()修改数据类型

使用带字典的方式批量修改数据类型

dtype_dict = {'A': 'int32',
             'B': 'int8', 
            'C': 'int16', 
              'D': 'int8',
             'E': 'int8',
              'F': 'int8'
             }
df.astype(dtype_dict)

结果出现问题：

KeyError                                  Traceback (most recent call last)
 in ()
      6               'D': 'int8'
      7              }
----> 8 df.astype(dtype_dict)

D:\AN\lib\site-packages\pandas\core\generic.py in astype(self, dtype, copy, errors, **kwargs)
   5671             for col_name in dtype.keys():
   5672                 if col_name not in self:
-> 5673                     raise KeyError('Only a column name can be used for the '
   5674                                    'key in a dtype mappings argument.')
   5675             results = []

KeyError: 'Only a column name can be used for the key in a dtype mappings argument.'

经过分析，是因为字典里的key手误写错了导致的