CODEWITHSUNDEEP
pythonpython-3.x
Abdullah
Abdullah

Reputation: 129

python draw half-triangle with numbers

I am trying to get this output (with comas):

1
2, 1
3, 2, 1
4, 3, 2, 1
5, 4, 3, 2, 1

The problem is, i am not able to "remove" the last coma (,) situated next to the number 1 on each line. Here is the code:

for i in range(1,6):
for x in range(i,0,-1):
    print("%i,"%(x), end=" ")
print()

Upvotes: 1

Views: 506

Answers (2)

Moinuddin Quadri
Moinuddin Quadri

Reputation: 48057

You may achieve it via using str.join with range and map:

>>> n = 5
>>> for i in range(n):
...     print(', '.join(map(str, range(i+1, 0, -1))))
...
1
2, 1
3, 2, 1
4, 3, 2, 1
5, 4, 3, 2, 1

If you are looking for one liner solution, then you may write it using nested str.join as:

>>> print('\n'.join(', '.join(map(str, range(i+1, 0, -1))) for i in range(n)))
1
2, 1
3, 2, 1
4, 3, 2, 1
5, 4, 3, 2, 1

where n is the count of number of lines needed to be printed.

Upvotes: 1

ᴀʀᴍᴀɴ
ᴀʀᴍᴀɴ

Reputation: 4528

Just try output last element after for loop: 

for i in range(1,6):
        for x in range(i,1,-1):
            print("%i,"%(x), end=" ")
        print("1", end=" ")
        print()
 #1 
 #2, 1 
 #3, 2, 1 
 #4, 3, 2, 1 
 #5, 4, 3, 2, 1

Upvotes: 0

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