Pycharm中的RestructeredText指定字典内容

Question

如何使用重构文本指定字典基类的内容？

class A(dict):
    """
    some restructered text here?
    """
    pass

a = A()
a["key1"] = B()
a["key2"] = B()
a["key3"] = 1 # here I'd like pycharm to show warning about types mismatch