fileorname : str or file-like
The file name or file from which to unpickle objects. If a file object,
it should have been opened in binary mode.
number : int
If 0, a single object will be returned (the first in the file). If >0,
this specifies the number of objects to be unpickled, and a list will
be returned with exactly that many objects. If <0, all objects in the
file will be unpickled and returned as a list.
usecPickle : bool
If True, the cPickle module is to be used in place of
pickle (cPickle is faster). This only applies for python 2.x.
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