How to create patterns in Python using nested loops?

Question

I am trying to create this pattern in Python:

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

I have to use a nested loop, and this is my program so far:

steps=6
for r in range(steps):
    for c in range(r):
        print(' ', end='')
    print('#')

The problem is the first column doesn't show up, so this is what is displayed when I run it:

#
 #
  #
   #
    #
     #

This is the modified program:

steps=6
for r in range(steps):
    print('#')
    for c in range(r):
        print(' ', end='')
    print('#')

but the result is:

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

How do I get them on the same row?

You are not printing any start at the begining of each row.

hivert
– hivert

2014-03-09 19:39:04 +00:00
Commented Mar 9, 2014 at 19:39 — hivert
– hivert, Commented Mar 9, 2014 at 19:39

anon582847382 · Accepted Answer · 2014-03-09 21:25:46Z

3

Replace this...:

steps=6
for r in range(steps):
    for c in range(r):
        print(' ', end='')
    print('#')

With this:

steps=6
for r in range(steps):
    print('#', end='')
    for c in range(r):
        print(' ', end='')
    print('#')

Which outputs:

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

It's just a simple mistake in the program logic.

However, it is still better to do this:

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

To avoid complications like this happening when using nested for loops, you can just use operators on the strings.

edited Mar 9, 2014 at 21:25

answered Mar 9, 2014 at 19:40

anon582847382

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Comments

Selcuk · Accepted Answer · 2014-03-09 19:40:03Z

2

Try this simpler method:

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

answered Mar 9, 2014 at 19:40

Selcuk

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1 Comment

user3307366 Over a year ago

Your program works perfectly, but I'm required to use a nested loop structure. Thank you!

Paul Becotte · Accepted Answer · 2014-03-09 19:38:40Z

0

You forgot the second print "#". Put it before the inner loop.

answered Mar 9, 2014 at 19:38

Paul Becotte

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Comments

Salu · Accepted Answer · 2015-03-06 16:37:21Z

0

Try something like this:

rows=int(input("Number")) s=rows//2 for r in range(rows): print("#",end="") print() for r in range(rows): while s>=0: print("#"+" "*(s)+"#") s=s-1 print("#")

answered Mar 6, 2015 at 16:37

Salu

1

1 Comment

Salu Over a year ago

To get an inverse result

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