Python NET init a jagged array

Question

I would like to init a .NET jagged array from Python using the pythonnet packages. For an one dimensional array I can do it like that:

import clr
from System import Array
a = Array[int]([1, 2, 3])

But how can I do that for jagged array? So let's assume I've in python the following list of list:

[[1, 2, 3], [4, 5, 6]]

In C# I would do it like that:

int[][] a = new int[][] { new int[] { 1, 2, 3 }, new int[] { 4, 5, 6 }};

Wild guess here from *Nix land: Array[Array[int]]([[1, 2, 3], [4, 5, 6]]) — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Jan 24, 2019 at 6:28
relevant: grokbase.com/t/python/ironpython-users/095vyfwt24/… so try: Array[Array[int]]((Array[int]((1,2,3)), (Array[int]((4,5,6))) — juanpa.arrivillaga
– juanpa.arrivillaga, Commented Jan 24, 2019 at 6:30
@juanpa.arrivillaga b = Array[Array[int]]([Array[int]([1,2,3]), Array[int]([4,5,6])]) works. But how can I write a python function that converts a jagged array which has n dimensions? — Wollmich
– Wollmich, Commented Jan 24, 2019 at 7:22

Wollmich · Accepted Answer · 2019-01-24 09:01:39Z

2

In Python it can be done like that:

b = Array[Array[int]]([Array[int]([1,2,3]), Array[int]([4,5,6])])

or if you define a helper function:

def asnetarray(x, defaulttype):
    if type(x) is list:
        if any([type(xi) is list for xi in x]):
            # Array of array
            return asnetarray([asnetarray(xi, defaulttype) for xi in x], defaulttype)
        elif x:
            # Array
            return Array[type(x[1])](x)
        else:
            # Empty array
            return Array[defaulttype]([])
    else:
        # Single element
        return Array[type(x)]([x])

then this can be used as:

# int[][]
b = asnetarray([[1, 2], [3, 4]], int)
# int[][][]
c = asnetarray([[[1, 2], [3, 4]], [[5, 6], [7, 8]]], int)

answered Jan 24, 2019 at 9:01

Wollmich

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