解压缩一个没有文件的泡菜变量？

Question

I pickled a python variable without opening a file using this code below, but I can't seem to unpack it without a file.

import pickle

class Foo:
   attr = 'a class attr'

picklestring = pickle.dumps(Foo)

print(picklestring)

Answer 1

To unpickle from a bytes object, use pickle.loads :

In [3]: import pickle
   ...:
   ...: class Foo:
   ...:    attr = 'a class attr'
   ...:
   ...: picklestring = pickle.dumps(Foo)
   ...:
   ...: print(picklestring)
   ...:
b'\x80\x03c__main__\nFoo\nq\x00.'

In [4]: pickle.loads(picklestring)
Out[4]: __main__.Foo