Asterisk art in python

Question

I would like to produce this picture in python!

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


        

Answer 1

 '%10s'    %'*'*x

is being parsed as

('%10s' % '*') * x

because the % and * operators have the same precedence and group left-to-right^[docs]. You need to add parentheses, like this:

x = 1
while x < 10:
    print '%10s' % ('*' * x)
    x = x + 1

If you want to loop through a range of numbers, it's considered more idiomatic to use a for loop than a while loop. Like this:

for x in range(1, 10):
    print '%10s' % ('*' * x)

for x in range(0, 10) is equivalent to for(int x = 0; x < 10; x++) in Java or C.