1

So I've recently started learning python and my friend gave me a changllege. How to make a number triangle. So basically, I need to make python let me input a number, for example 5. After I do that, I want python to print

54321
4321
321
21
1

But because I am new to python, I don't know how to do it. So far, I've got this:

x = int(input('Enter a Number: '))

for i in range(x,0,-1):
  print(i,end='')
  if i != 0:
    continue
  else:
    break

And the output is:

Enter a Number: 5
54321

Any ideas how to make it print 54321 4321 321 21 1 ? Thanks for any advice

  • You `break` on the first iteration. And additionally a `continue` as the effectively last command of the block makes no sense. – Klaus D. Aug 29 '22 at 05:52

4 Answers4

2

Here is a sample code for you.

Short version (suggest learning about list comprehension and join functions):

x = int(input('Enter a Number: '))
for i in range(x, 0, -1):
    print(''.join([str(j) for j in range(i, 0, -1)]))

Longer version which is easier to understand:

for i in range(x, 0, -1):
    s = ''
    for j in range(i, 0, -1):
        s += str(j)
    print(s)

Output:

54321
4321
321
21
1
Quan Nguyen
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    `[[print(i + 1, end=" ") if i < j else print() for i in reversed(range(j + 1))] for j in reversed(range(int(input("enter triangle number: ")) + 1))]` list comprehension :) – rishi Aug 29 '22 at 06:06
1
rows = int(input("Inverted Right Triangle Numbers  = "))

print("Inverted")

for i in range(rows, 0, -1):
    for j in range(i, 0, -1):
        print(j, end = ' ')
    print()

Output

5 4 3 2 1 
4 3 2 1 
3 2 1 
2 1 
1
Bhargav - Retarded Skills
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1
def trig_print(number):
    if number > 0:
        for i in range(number):
            print(number - i,end='')
        print('')
        number = number - 1
        trig_print(number)
    else:
        return 0

trig_print(5)
0to1toeverything
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0

I used to solve it by while loop.

3 step

  1. input initial number.
  2. make list one to initial number.
  3. reverse list and print it.
>>> x = int(input('Enter a Number: '))
Enter a Number: 5
>>> while x >0 : 
    l=list(range(1,x+1)) # range function
    l.reverse()  # list.reverse function
    print(' '.join(map(str,l))) # join and map function
    # I recomanded input space between number for readability.
    x -= 1 
    
5 4 3 2 1
4 3 2 1
3 2 1
2 1
1
student
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