>>> from sumatori import sumatori

>>> suma,nterm = sumatori(0.1,1,0.01)
>>> suma
0
>>> nterm
0

>>> suma,nterm = sumatori(0.1,-0.2507,0.01)
>>> round(suma,5)
0.56469
>>> nterm
6

>>> suma,nterm = sumatori(0.1,-0.2507,0.001)
>>> round(suma,7)
-0.1768695
>>> nterm
9

>>> suma,nterm = sumatori(0.1,-0.2507,0.0001)
>>> round(suma,4)
-0.6776
>>> nterm
11

>>> suma,nterm= sumatori(0.1,-0.2507,0.00001)
>>> round(suma,9)
-0.928272109
>>> nterm
12

>>> suma,nterm = sumatori(0.35,-0.2117,0.0001)
>>> round(suma,6)
0.028248
>>> nterm
8

>>> suma,nterm = sumatori(0.35,-0.2117,0.001)
>>> round(suma,8)
0.23963486
>>> nterm
7