Python 2.7 List Comprehension Number Pyramid

I am trying to create the following number pyramid using nested list comprehension and string formatting. 1 2 4 3 6 9 4 8 12 16 5 10 15 20 25 6 12 18 24 30 36 7 14

Solution 1:

You could use range to build up each nested list, like so:

# Generation
result= [range(x, x**2+1, x) for x inrange(1, 8)]

# Formatting
print('\n'.join(''.join(str(x).ljust(4) for x inrow) forrowinresult))

Output:

1
2   4
3   6   9
4   8   12  16
5   10  15  20  25
6   12  18  24  30  36
7   14  21  28  35  42  49

Solution 2:

You can join a list of lists (in this case, a generator of generators) by newlines

print('\n'.join(' '.join(str(i*j) for j inrange(1, i+1)) for i inrange(1, n+1)))

#1#2 4#3 6 9#4 8 12 16#5 10 15 20 25#6 12 18 24 30 36#7 14 21 28 35 42 49

and if you want to have the list that creates it just do:

rows= [[i*j for j inrange(1, i+1)] for i inrange(1, n+1)]