Python: Add compiled object to Memcached

Question

I try to add a compiled object to Memcached that is regularly used. The compiled object does never change.

cache.set(eq, compile(eq, '<string>', 'eval'), 365*24*60*60)

But get the following error message:

Can't pickle < class 'code' >: attribute lookup code on builtins failed

Is there any solution to this problem or an alternative approach?

score 0 · Accepted Answer · answered May 25 '19 at 01:53

You can use marshal module which is specifically designed for internal object serialization

cache.set(eq, marshal.dumps(compile(eq, '<string>', 'eval')), 365*24*60)
  ...
eval(marshal.loads(cache.get(eq)))

alternatively you can store the source

cache.set(eq, eq, 365*24*60)
   ...
eval(cache.get(eq))

Either way you may need to evaluate potential security risks of executing code retrieved from external cache.

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