3.3.4.2 Coordinate representation

The methods accept an ordered set of coordinates in the form of a coordinate sequence. Coordinates can be of type int, long, or float. A valid coordinate sequence is a non-empty sequence of either

Alternating x and y coordinates. In this case the sequence length must be even, or
Sequences of two elements, that specify x and y coordinates.

Examples of valid coordinate sequences:

(1, 221L, 3, 4, 5.85, -3): A sequence of three coordinates
[(1,221L),(3,4),[5.12,6]): A sequence of three coordinates
(1,5): A sequence of one coordinate
[(1,5)]: A sequence of one coordinate
[[1,5]]: A sequence of one coordinate

Examples of invalid coordinate sequences:

Invalid code, do not use!

[]: An empty sequence
(1,2,3): Odd number of elements in a flat sequence
[(1,2),(3,4),None]: Contains an invalid element
([1,2],3,4): Mixing the flat and nested form is not allowed

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