a =  [0.16783458583826283,
 0.522388408702815,
 0.3898707561845427,
 0.11718535975847377,
 2.339774725582763]

cu = float('inf')
for i in a:
    for ii in a:
        w = abs(i-ii)
        if w < cu and not w is 0.0:
            cu = w
print(cu)

cu = 0.0