这是一段 flask_admin 的代码
继承自type和继承自object有什么不同？
为什么要用type.__init__() 调用type的 __init__， type里有东西吗？
class AdminViewMeta(type):
"""
View metaclass.
Does some precalculations (like getting list of view methods from the class) to avoid
calculating them for each view class instance.
"""
def __init__(cls, classname, bases, fields):
type.__init__(cls, classname, bases, fields)
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