Generate a grid of random coordinates

I want to generate a set of 16 (x,y) coordinates in a 4x4 square grid, such that for each (x,y) the nearest neighbour distance is 1.1m.

I have tried :

rad=1 

rangeX=(0,4)

rangeY=(0,4)

randPts=[]

for i in range(0,15):

    for j in range(i+1,qty):

        x=random.randrange(*ranx)
        y=random.randrange(*rany)
        if (np.sqrt(((x[i]-x[j])**2)+((y[i]-y[j])**2)) != 1.1):
            randPts.append((x,y))

This is giving me the error : TypeError: 'int' object has no attribute '__getitem__' Can anyone kindly suggest how I can generate the required (x,y) grid?

Thanks in advance.