def least_difference(a,b,c):
    diff1=abs(a-b)
    diff2=abs(b-c)
    diff3=abs(a-c)
    return min(diff1,diff2,diff3)
print(
    least_difference(1, 10, 100),
    least_difference(1, 10, 10),
    least_difference(5, 6, 7), # Python allows trailing commas in argument lists. How nice is that?
)
help(least_difference)