Basic_multiply not working for me. Does not give the product of the two polynomials

Data Structures and Algorithms in Python Assignment 3 - Sorting and Divide & Conquer Practi
#1

Why don’t I get the answer? What is wrong here. Appreciate help

def multiply_basic(poly1, poly2):

#poly1 = [2, 0, 5, 7]
#poly2 = [3, 4, 2]


len_poly1 = len(poly1)
len_poly2 = len(poly2)
multiply_basic = []
multiply_basic_len = len_poly1 + len_poly2 - 1
print(len(poly1))
print(len(poly2))
for i in range(multiply_basic_len):
    multiply_basic.append(0)

for i in range(len_poly1):
    for j in range(len_poly2):
        multiply_basic[i+j] += poly1[i] * poly2[j]
else:
    return

multiply_basic([2, 0, 5, 7], [3, 4, 2])

print(multiply_basic)

#2

You don’t get the answer… because you don’t return anything.

Just return the result and it should work.

PS: the return in for ... else won’t work, because that’s not how it’s supposed to be used.
Also no idea why you print(multiply_basic). That won’t work as well.

#3

Thanks, Sebgolos.
When I execute the multiply_basic code, I get the following output

<function multiply_basic at 0x7f67dc46d940>

What does it mean and how to fix it? Thanks.

#4

Won’t work because you aren’t calling the function.

You’re print the function, not the result of it. You need to call it with parentheses.

#5

try:
`multiply_basic_len = (len_poly1 + len_poly2) - 1 since output length was defined as (m+n)-1

for i in range(multiply_basic_len):
multiply_basic.append(0). ------what is the (0) that you want to add to the list?

multiply_basic([2, 0, 5, 7], [3, 4, 2])--------unquote poly1 and poly2 variables and use it for this line since you assigned the lists to these variables.

else:
return. ----what are your returning?

multiply_basic[i+j] ------this will give an error…maybe you’re trying to append the product to the list?