Best way to modify coordinates and add points to MultiPoint object

[fuhrmanj]

Hello,

I would like to know what would be the best way to

1. modify the coordinates of points in an MultiPoint object and
2. add additional points to an MultiPoint object.

Thank you in advance!
Cheers
Josh

[mwtoews]

Here's a quick ipython demo:

In [1]: from shapely.geometry import MultiPoint

In [2]: mp = MultiPoint([(1, 2), (3, 4)])

In [3]: mp
Out[3]: <MULTIPOINT (1 2, 3 4)>

In [4]: mp_list = list(mp.geoms)  # convert to mutable list of Point objects

In [5]: mp_list
Out[5]: [<POINT (1 2)>, <POINT (3 4)>]

In [6]: mp_list.append((5, 6))  # add additional point

In [7]: mp_list[1] = (7, 8)  # modify existing point in second index position

In [8]: mp_list  # this is now a mixed Point and tuple list, which should be fine
Out[8]: [<POINT (1 2)>, (7, 8), (5, 6)]

In [9]: MultiPoint(mp_list) # voila
Out[9]: <MULTIPOINT (1 2, 7 8, 5 6)>

This demo should work the same for Shapely 2 or earlier, although the outputs will look different.

[fuhrmanj]

Thanks for your answer, I wonder if it is not faster to start directly with a list of points instead of a MultiPoint object.