slice
An object usually containing a portion of a sequence. A slice is created using the subscript notation, [] with 
colons between numbers when several are given, such as in variable_name[1:3:5]. The bracket (subscript) notation
uses slice objects internally.

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class slice(stop)
class slice(start, stop, step=1)
Return a slice object representing the set of indices specified by range(start, stop, step). The start and step 
arguments default to None. 

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