pickle无法序列化动态创建的class，要怎么做才能存储动态创建的类？

Z时代
2024-02-15
分类：IT

import pickle
class B:
    a = 1
    b = 2
    c = 3
    my = []
def you():
    with open("you.pkl", "wb") as f:
        pickle.dump(B, f)
def my():
    conf_txt = """
class A:
    a = 1
    b = 2
    c = 3
    my = []
    """
    glob, loc = {}, {}
    exec(conf_txt, glob, loc)
    with open("conf.pkl", "wb") as f:  # 'loc': {'A': <class 'A'>}
        # error, _pickle.PicklingError: Can't pickle <class 'A'>: attribute lookup A on builtins failed
        pickle.dump(loc["A"], f) 
def that():
    C = type("C", (B, ), {"hello":"tom"})
    print("hello:", C.hello)
    with open("c.pkl", "wb") as f:
        # _pickle.PicklingError: Can't pickle <class '__main__.C'>: attribute lookup C on __main__ failed
        pickle.dump(C, f)
if __name__ == "__main__":
    you()    # it works
    my()     # 有问题    # that() # 有问题