CODEWITHSUNDEEP
python-3.xfor-loopnested-loops
Kaushik
Kaushik

Reputation: 187

To print a pattern in Python using 'for' loop

I tried various programs to get the required pattern (Given below). The program which got closest to the required result is given below:

Input:

for i in range(1,6):
    for j in range(i,i*2):
        print(j, end=' ')
    print( )

Output:

1 
2 3 
3 4 5 
4 5 6 7 
5 6 7 8 9

Required Output:

1
2 3
4 5 6
7 8 9 10

Can I get some hint to get the required output?

Note- A newbie to python.

Upvotes: 1

Views: 1499

Answers (2)

user2390182
user2390182

Reputation: 73460

If you don't want to keep track of the count and solve this mathematically and be able to directly calculate any n-th line, the formula you are looking for is the one for, well, triangle numbers:

triangle = lambda n: n * (n + 1) // 2
for line in range(1, 5):
    t = triangle(line)
    print(' '.join(str(x+1) for x in range(t-line, t)))
# 1
# 2 3
# 4 5 6
# 7 8 9 10

Upvotes: 0

OneCricketeer
OneCricketeer

Reputation: 191728

Store the printed value outside of the loop, then increment after its printed 

v = 1
lines = 4
for i in range(lines):
    for j in range(i):
        print(v, end=' ')
        v += 1
    print( )

Upvotes: 1

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