x = array([1,2,3,4,5])
y = array([1,2,3,4,5])
scatter(qnkt,Is)
p1 = polyfit(x, y, 1)
y,delta = polyval(p1,x)
graph1 = poly1d(p1)
ys = graph1(qnkt)
plot(x, ys)

y,delta = polyval(p1,qnkt)
ValueError: too many values to unpack

>>> a,b = (1,2,3)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: too many values to unpack

>>> a,b = (1,)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: need more than 1 value to unpack

>>> polyval(p1,x)
array([ 1.,  2.,  3.,  4.,  5.])