python: converting numpy array to fixed float numbers

I am dealing with a Python function that compute geometrical center for all elements of nestled array representing XYZ coordinates

  def lig_center(nested_array_list):
        a = numpy.array(nested_array_list)
        mean = numpy.mean(a, axis=0)
        return mean[0], mean[1], mean[2]  # x, y, z
    
# input list 

xyz= [[121.133, 146.696, 139.126], [121.207, 145.489, 138.437], [122.058, 145.337, 137.335], [121.972, 143.689, 136.593], [123.209, 143.616, 135.31], [124.536, 143.881, 135.697], [124.87, 145.234, 135.928], [126.179, 145.569, 136.301], [127.156, 144.591, 136.455], [126.838, 143.258, 136.229], [123.824, 146.34, 135.736], [125.543, 142.913, 135.853], [123.008, 142.449, 134.454], [120.662, 143.598, 135.938], [122.362, 142.722, 137.625], [122.857, 146.427, 136.913], [122.764, 147.633, 137.625], [121.914, 147.77, 138.718], [123.101, 146.373, 134.374], [122.534, 147.208, 134.333], [122.482, 145.576, 134.33], [124.016, 146.346, 133.138], [125.066, 147.46, 133.272], [124.449, 148.847, 133.177], [123.972, 149.313, 131.947], [123.409, 150.582, 131.856], [123.322, 151.385, 132.993], [123.796, 150.925, 134.221], [124.36, 149.655, 134.314], [122.769, 152.634, 132.905], [123.339, 153.323, 133.255]]
# calculate geonetrical center of each element of xyz
col=lig_center(xyz)
# result"(123.51000000000001, 146.66999999999999, 135.30000000000001)

how I could obtain result of col in the following format:

# just three float numbers with fixed number of digits after .
123.510 146.669 135.300

Answer

Use numpy.around to round all values in an array to a specified number of decimals:

import numpy as np
...
col = np.around(col, 3)