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Python 2 has both the pickle and cPickle modules for serialization.
cPickle has an obvious advantage over pickle: speed. What, if any, advantage does pickle have over cPickle?
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Pickle on the other hand is slow, insecure, and can be only parsed in Python. The only real advantage to pickle is that it can serialize arbitrary Python objects, whereas both JSON and MessagePack have limits on the type of data they can write out.
cPickle supports most elementary data types (e.g., dictionaries, lists, tuples, numbers, strings) and combinations thereof, as well as classes and instances. Pickling classes and instances saves only the data involved, not the code.
In Python 2, cPickle is the accelerated version of pickle, and a later addition to the standard library. It was perfectly normal to import it with a fallback to pickle. In Python 3 the accelerated version has been integrated and there is simply no reason to use anything other than import pickle .
An alternative is cPickle. It is nearly identical to pickle , but written in C, which makes it up to 1000 times faster. For small files, however, you won't notice the difference in speed. Both produce the same data streams, which means that Pickle and cPickle can use the same files.
The pickle module implements an algorithm for turning an arbitrary Python object into a series of bytes. This process is also called serializing” the object. The byte stream representing the object can then be transmitted or stored, and later reconstructed to create a new object with the same characteristics.
The cPickle module implements the same algorithm, in C instead of Python. It is many times faster than the Python implementation, but does not allow the user to subclass from Pickle. If subclassing is not important for your use, you probably want to use cPickle.
Source of above information.
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I found this regarding pickle and cPickle:
"The pickle module implements an algorithm for turning an arbitrary Python object into a series of bytes....
The cPickle module implements the same algorithm, in C instead of Python. It is many times faster than the Python implementation, but does not allow the user to subclass from Pickle.
If subclassing is not important for your use, you probably want to use cPickle."
Source: https://pymotw.com/2/pickle/
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