Syntax

• obj[start:stop:step]
• slice(stop)
• slice(start, stop[, step])

Parameters

• obj | The object that you want to extract a “sub-object” from
• start | The index of obj that you want the sub-object to start from (keep in mind that Python is zero-indexed, meaning that the first item of obj has an index of 0). If omitted, defaults to 0
• stop | The (non-inclusive) index of obj that you want the sub-object to end at. If omitted, defaults to len(obj). step | Allows you to select only every step item. If omitted, defaults to 1

Remarks

You can unify the concept of slicing strings with that of slicing other sequences by viewing strings as an immutable collection of characters, with the caveat that a unicode character is represented by a string of length 1.

In mathematical notation you can consider slicing to use a half-open interval of [start, end), that is to say that the start is included but the end is not. The half-open nature of the interval has the advantage that len(x[:n]) = n where len(x) > =n, while the interval being closed at the start has the advantage that x[n:n+1] = [x[n]] where x is a list with len(x) >= n, thus keeping consistency between indexing and slicing notation.

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