How do I increase each new line by 1 or more in a for loop?

Question

Trying to print a number triangle that does the following: numTri(6)

1
23
456

Edit:(all new line) What I have so far:

def numTri(n): 
  a = 0
  for x in range(1,n+1):
    a = 10*a + x
    print a

Any hints? I don't want the answer. Some guidance would be well appreciated.

Answer 1

Woot this is my first post! (Edit: I posted the python code since someone else had posted the complete answer already). The following approaches this problem from a different perspective and needs only one loop. Hope this helps.

def numTri(n):
    x = list(range(1,n+1)) #creates a list of numbers ([1],[2],...,[n])
    i = 0
    ln = 1
    while i < n+1:
        print(x[i:i+ln])   #prints a partition of the list of numbers
        i += ln
        ln += 1

NB: you may need to adjust the print function, I was using python 3.5

Answer 2

As you have said guidance.

Python code

def numTri(n):
    a=1
    col_per_row=1
    while a<=n:
        s=""
        for y in range(1,col_per_row+1):
            s+=str(a)
            a=a+1
        col_per_row=col_per_row+1
        if(a==n+1):
            print(s),
        else:
            print(s)

• The comma after print statement is for avoiding the newline in Python-2
• In Python-3 you can use print(s,end="")

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