Django使用 makemigrations 做数据迁移的时候报如下错误

  File "/Users/jkc/.virtualenvs/django_env/lib/python3.7/site-packages/django/db/backends/mysql/operations.py", line 146, in last_executed_query
    query = query.encode(errors='replace')
AttributeError: 'bytes' object has no attribute 'encode'
进入到operations.py文件中，找到第146行，原来的代码是这样的


改为下图所示即可


这里为了方便，复制下面代码即可
query = query.encode(errors='replace') if isinstance(query, str) else query.decode(errors='replace')
                            
attributeError: 'NoneType' object has no attribute 'shape' 报错
attributeError: 'NoneType' object has no attribute 'shape' 报错
                            
 attributeError: 'NoneType' object has no attribute 'shape' 报错 可能是因为没有设置路径，所以返回的类型是None。 改正的方法是，读取图片时把路径也写上
                            
AttributeError: ‘list‘ object has no attribute ‘reshape‘  ‘list‘ object has no attribute ‘reshape‘
                            
 def image2vector(image):    """    Argument:    image -- a numpy array of shape (length, height, depth)        Returns:    v -- a vector of shape (length*height*depth, 1)    """        将三维变为一维输出    v = np.array(image).reshape(np.array(image).sh.