Pickling and unpickling

Explain pickling and unpickling.

- Pickle is a standard module which serializes & de-serializes a python object structure.

- Pickle module accepts any python object converts it into a string representation & dumps it into a file(by using dump() function) which can be used later, process is called pickling. Whereas unpickling is process of retrieving original python object from the stored string representation for use.
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