Hi,
As you know we can't pickle the lambda functions in the standard pickle module.
So, for that reason the shelve library also can't do that.
What if we can define the custom pickler and unpickler for the shelve module?
We couldn't do this before;
import shelve
with shelve.open("test_file") as sh:
squared = lambda x: x ** 2
sh['test_key'] = squared
Now, we can easily do it;
(https://gist.github.com/furkanonder/436d1b23eede54650107924e747b5d77)
import dill
import shelve
with shelve.open("test_file_2", pickler=dill.Pickler, unpickler=dill.Unpickler)
as sh:
squared = lambda x: x ** 2
sh['test_key'] = squared
I could easily solve this problem I had while using the Shelve module. I
believe that shelve module will be a more useful module by adding support for
custom unpickler and pickler.
Kindest regards,
Furkan Onder_______________________________________________
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