Python Declare variables iteratively

Question

I'm working on an assignment in which I need to print a "diamond" after the user typed in the dimensions they wanted. Example:

If the user types 5 it looks like this:

  |
 |||
|||||
 |||
  |

If the user types 10 it looks like this:

      |
     |||
    |||||
   |||||||
  |||||||||
  |||||||||
   |||||||
    |||||
     |||
      |

My idea is to initialize an array for each row that I need to print but I don't know how to automatically initialize multiple arrays corresponding to the number the user typed in.

Any help is welcome and feel free to tell me if you think I'm going totally the wrong way!

get the user input dimensions and then do a for loop and print arrays depending on the input — Nicolas Nicolas
– Nicolas Nicolas, Commented Jan 26, 2016 at 19:57

furas · Accepted Answer · 2016-01-26 19:58:33Z

1

If it helps you can use "array" (or rather two-dimensional list).

To create row with 10 letters "X"

row = [ "X" ] * 10

But to create "array" with 10 rows you can't do

array = [  [ "X" ] * 10  ] * 10

because you get all rows as references to the same space in memory.

You need

array = []

for i in range(10)
    row = [ "X" ] * 10
    array.append(row)

Or shorter

array = [ [ "X" ] * 10 for i in range(10) ]

(in place of "X" you can use space " ")

answered Jan 26, 2016 at 19:58

furas

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1 Comment

Gaboik Over a year ago

Thank you! It does help! :)

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