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:

Could anyone please point out the error for me?

Why do you need the `if` statement, the `for` loop stops when it gets to 10 automatically. — Barmar, Dec 31 '20 at 22:09

score 1 · Answer 1 · edited Dec 31 '20 at 22:29

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

edited Dec 31 '20 at 22:29

wjandrea

28,235
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60
81

answered Dec 31 '20 at 22:10

Red

26,798
7
36
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I got the answer, people! Thanks to everyone who helped! Oh, Happy New Year, btw! – Dec 31 '20 at 22:16
@john Excellent! Please upvote answers you find useful, and accept the best one. For reference see [What should I do when someone answers my question?](/help/someone-answers). – wjandrea Dec 31 '20 at 22:27

score 1 · Answer 2 · answered Dec 31 '20 at 22:13

1

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)

answered Dec 31 '20 at 22:13

Barmar

741,623
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500
612

score 1 · Answer 3 · answered Dec 31 '20 at 22:18

1

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)

answered Dec 31 '20 at 22:18

anik jha

139
1
9

score 0 · Answer 4 · answered Dec 31 '20 at 22:35

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.

Printing a Multiplication Table Using Python Nested For Loops

4 Answers4