def ci(a, which=95, axis=None):
 p = ((50 - (which / 2)), (50 + (which / 2)))
 return percentiles(a, p, axis)

def ci ( a , which = 95 , axis = None ) : p = ( ( 50 - ( which / 2 ) ) , ( 50 + ( which / 2 ) ) ) return percentiles ( a , p , axis )
return a percentile range from an array of values .