Multiplication Table

Write a multiplication table based on a maximum input value.

example:

> Please input number: 10
1    2    3    4    5    6    7    8    9    10  
2    4    6    8    10   12   14   16   18   20  
3    6    9    12   15   18   21   24   27   30  
4    8    12   16   20   24   28   32   36   40  
5    10   15   20   25   30   35   40   45   50  
6    12   18   24   30   36   42   48   54   60  
7    14   21   28   35   42   49   56   63   70  
8    16   24   32   40   48   56   64   72   80  
9    18   27   36   45   54   63   72   81   90  
10   20   30   40   50   60   70   80   90   100 

Implementation

This solution is dynamic because it depends on the number of digits in each result. If the maximum number in the table is 100, then the results can have:

three spaces → 1–9

two spaces → 10–99

one space → 100

So to align everything, you look at the biggest number in the table and check how many digits it has. You can do this mathematically (using tens) or simply by getting the length of the string of the number.

Then you add the right amount of spaces before each value to keep the table lined up.

num = int(input("Please input number: "))
max_spaces = len(str(num * num)) 
row = []

for i in range(1, num + 1):
    for j in range(1, num + 1):
        product = str(i * j)
        space =  " " * (max_spaces + 1 - len(product))
        row.append(product + space)
    
    print(*row)
    row = []