Python nested loop triangle

Question

The output I am trying to achieve is :

##
# #
#  #
#   #
#    #
#     #

The code I have is :

NUM_STEPS = 6

for r in range(NUM_STEPS):
   for c in range(r):
      print(' ', end='')
   print('#','\t')
   print('#')

Its close, but not quite the output I am trying to achieve. Any help or suggestions are most appreciated.

If you love one-liners: print(*((' '*x).join('##') for x in range(6)), sep='\n') — Ashwini Chaudhary
– Ashwini Chaudhary, Commented Apr 20, 2014 at 15:57

jfs · Accepted Answer · 2014-04-22 02:44:28Z

4

The main thing is you should use '+' (or concat) to build up a string before printing it. You can eliminate the inner loop by using '*' to make r spaces, which cleans things up a lot.

NUM_STEPS = 6
for r in range(NUM_STEPS):
    print("#" + (' ' * r) + "#")

edited Apr 22, 2014 at 2:44

jfs

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answered Apr 20, 2014 at 15:49

rongenre

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1 Comment

nneonneo Over a year ago

Yes, the * operator for strings really is handy :)

laurencevs · Accepted Answer · 2014-04-20 15:55:17Z

1

This seemed to work when I tried it:

for r in range(NUM_STEPS):
    print("#", end = "")
    for c in range(r):
        print(" ", end = "")
    print("#")

I hope it helps.

answered Apr 20, 2014 at 15:55

laurencevs

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