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@@ -11,3 +11,15 @@ Return the pickled representation of an object as a bytes object.
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Return the unpickled object from a bytes object.
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+
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+## What can be pickled and unpickled?
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+
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+The following types can be pickled:
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+
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+- [x] None, True, and False;
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+- [x] integers, floating-point numbers;
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+- [x] strings, bytes;
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+- [x] tuples, lists, sets, and dictionaries containing only picklable objects;
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+- [ ] functions (built-in and user-defined) accessible from the top level of a module (using def, not lambda);
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+- [ ] classes accessible from the top level of a module;
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+- [x] instances of such classes
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blueloveTH