Pyramid of asterisks program in Python

Question

I've written a program in C++ that displays a pyramid of asterisk (see below) and now I'd like to see how it's done in Python but it's not as easy as I'd thought it would be.

Has anyone tried this and if so could you show me code that would help out?

Thanks in advance.

       *
      ***
     *****
    *******
   *********
  ***********
 *************
***************

Answer 1

def pyramid(rows=8):
    for i in range(rows):
        print ' '*(rows-i-1) + '*'*(2*i+1)

pyramid(8)
       *
      ***
     *****
    *******
   *********
  ***********
 *************
***************

pyramid(12)
           *
          ***
         *****
        *******
       *********
      ***********
     *************
    ***************
   *****************
  *******************
 *********************
***********************

Answer 2

Or you could try:

def pyramid(size=8):
    for i in range(size):
        row = '*'*(2*i+1)
        print row.center(2*size)

Answer 3

I would suggest the following function:

def pyramid(rows=8):
    pyramid_width = rows * 2
    for asterisks in range(1, pyramid_width, 2):
        print("{0:^{1}}".format("*" * asterisks, pyramid_width))

Then try with:

pyramid()

or with:

pyramid(4)

Answer 4

You can use string multiplication like so:

>>> for i in range(size):
...     print '%s%s'%(' '*(size-(i-1)),'*'*((i*2)-1))
...

Answer 5

This code isn't very pythonic, but it's readable. Look at Hugh Bothewell's answer for a compact pyramid drawing function:

def drawPyramid(rows):
  result = ''

  for i in xrange(rows):
    row = ''
    row += ' ' * (rows - i - 1)
    row += '*' * (2 * i + 1)

    result += row + '\n'

  return result

print drawPyramid(20)

Answer 6

If you like list comprehensions:

> n = 5
> print("\n".join((i*"*").center(n*2) for i in range(1, n*2, 2)))

    *
   ***
  *****
 *******
*********

Answer 7

n=4
m = (2*n)-2
for i in range(0, m):
    for j in range(0, m):
       print(end=" ")
    m = m - 1 # decrementing m after each loop
    for j in range(0, i + 1):
    # printing full Triangle pyramid using stars
       print("* ", end=' ')
print(" ")  


  *   
 *  *   
*  *  *   

---

---

---

Answer 8

def pyramid(row):
       for n in range(row):
              print(' '*(n+1)+' '*(2*(row-n))+'x'+'x'*(2*n+1))

pyramid(row=8)

Answer 9

Though I am very much new to python, so here is how I solved it:

k=int(input("Enter the number of rows"))
for i in range(1,k):
    print(' '*(k-i),'* '*(i))

      * 
     * * 
    * * * 
   * * * * 
  * * * * * 
 * * * * * * 
* * * * * * * 

---

---

Answer 10

#!/usr/bin/python
for i in range(1,6):
 for j in range(1,i+1):
   print "*",
 print

O/P: 
===
*
* *
* * *
* * * *
* * * * *

2) 
#!/usr/bin/python
for i in range(1,6):
 for j in range(1,7-i):
   print "*",
 print

O/P:
* * * * *
* * * *
* * *
* *
*

3)
#!/usr/bin/python
for i in range(1,6):
 for j in range(1,6-i):
   print "",
 for k in range(1,i+1):
  print "*",
 print

O/P:

    *
   * *
  * * *
 * * * *
* * * * *

4)
#!/usr/bin/python
for i in range(1,6):
 for j in range(1,1+i):
   print "",
 for k in range(1,7-i):
  print "*",
 print

O/P:
 * * * * *
  * * * *
   * * *
    * *
     *
5) 
#!/usr/bin/python
for i in range(1,6):
 for j in range(1,6-i):
   print "",
 for k in range(1,i+1):
  print "*",
 print
for i in range(1,5):
 for j in range(1,1+i):
   print "",
 for k in range(1,6-i):
  print "*",
 print


O/P:
    *
   * *
  * * *
 * * * *
* * * * *
 * * * *
  * * *
   * *
    *

Answer 11

You can also draw a DIAMOND

def pyramid(r):
    for i in range(r):
        print ("  "*(r-i-1) + "*"*(2*i+1))
    for i in range(r-1,-1,-1):
        print ('  '*(r-i-1) + "*"*(2*i+1))

n=int(input("Enter no of rows:"))
pyramid(n)

pyramid(10)

                  *
                * * *
              * * * * *
            * * * * * * *
          * * * * * * * * *
        * * * * * * * * * * *
      * * * * * * * * * * * * *
    * * * * * * * * * * * * * * *
  * * * * * * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * *  
  * * * * * * * * * * * * * * * * *
    * * * * * * * * * * * * * * *
      * * * * * * * * * * * * *
        * * * * * * * * * * *
          * * * * * * * * *
            * * * * * * *
              * * * * *
                * * *
                  *
>>> 

Answer 12

user_input = input("How many rows do you want to print? \n")
def stars(a):
    size = int(a)
    for i in range(1, size+1):
        print(" "*(size-i),"*"*(i*2-1))
    

stars(user_input)

---

How many rows do you want to print?
20
                    *
                   ***
                  *****
                 *******
                *********
               ***********
              *************
             ***************
            *****************
           *******************
          *********************
         ***********************
        *************************
       ***************************
      *****************************
     *******************************
    *********************************
   ***********************************
  *************************************
 ***************************************

Answer 13

Pyramid, Inverted Pyramid and Diamond Rhombus in Python:

Pyramid

i=1
j=5
while i<=5:
 print((j*' ')+i*'* ')
 j=j-1
 i=i+1




     * 
    * * 
   * * * 
  * * * * 
 * * * * *


Inverted Pyramid

i=1
j=5
while i<=5:
 print((i*' ')+j*'* ')
 j=j-1
 i=i+1

 * * * * * 
  * * * * 
   * * * 
    * * 
     * 

Diamond Rhombus

i=1
j=5
while i<=5:
 print((j*' ')+i*'* ')
 while j<=5 & i==5:
  print(((j+1)*' ')+(5-j)*'* ')
  j=j+1
 j=j-1
 i=i+1



     * 
    * * 
   * * * 
  * * * * 
 * * * * * 
  * * * * 
   * * * 
    * * 
     * 

Answer 14

$ cat tree.py
def line(n, i):
    line = ''
    for j in range(n - i - 1):
        line += ' '
    for j in range(2 * i + 1):
        line += '*'
    for j in range(n - i - 1):
        line += ' '
    return line

def tree(n):
    for i in range(n):
        line_ = line(n, i)
        print(line_)

def run():
    tree(3)

if __name__ == '__main__':
    run()
$ python3 tree.py 
  *  
 *** 
*****
$ _