Printing a Multiplication Table Using Python Nested For Loops

Question

for i in range(3,33,3):
    for j in range(1,11,1):
        print("3 *", j, '=', i)
    if j == 10:
       break

This is the output that I am getting:

3 * 1 = 3                                                                                                                                                          
3 * 2 = 3                                                                                                                                                          
3 * 3 = 3                                                                                                                                                          
3 * 4 = 3                                                                                                                                                          
3 * 5 = 3                                                                                                                                                          
3 * 6 = 3                                                                                                                                                          
3 * 7 = 3                                                                                                                                                          
3 * 8 = 3                                                                                                                                                          
3 * 9 = 3                                                                                                                                                          
3 * 10 = 3 

Could anyone please point out the error for me?

Answer 1

Change the i to i * j :

for i in range(3,33,3):
    for j in range(1,11,1):
        print("3 *", j, '=', i * j)
    if j == 10:
        break

Here is a simplified version:

for i in range(1, 11):
    print(f"3 * {i} = {3 * i}")

Output:

3 * 1 = 3
3 * 2 = 6
3 * 3 = 9
3 * 4 = 12
3 * 5 = 15
3 * 6 = 18
3 * 7 = 21
3 * 8 = 24
3 * 9 = 27
3 * 10 = 30

Answer 2

If you just want to print multiples of 3 , you don't need two loops. Just one loop from 1 to 10, and then multiply that by 3.

for i in range(1, 11):
    j = i * 3
    print('3 *', i, '=', j)

Answer 3

I believe you want the product as well as the multiplier, you can use enumerate for this. The code will look something like this:

for i,j in enumerate(range(3,33,3)):
    print("3 *", i, '=', j)

Answer 4

You're doing nested loops*, but you meant to loop in parallel. You can do that with zip() :

for i, j in zip(range(3, 33, 3), range(1, 11)):
    print("3 *", j, '=', i)

Output:

3 * 1 = 3
3 * 2 = 6
3 * 3 = 9
3 * 4 = 12
3 * 5 = 15
3 * 6 = 18
3 * 7 = 21
3 * 8 = 24
3 * 9 = 27
3 * 10 = 30

Canonical question: How to iterate through two lists in parallel?

* This creates a Cartesian product , but it's cut short by the break .

---

However, in this case it's simpler to just do the math, like in Barmar's answer .