Simplifying Reverse Triangle Code (While Loop)

Question

I have successfully created a code to print a horizontally flipped triangle using a while loop. Now although it works, I was wondering if i could simplify this i.e. without using a "store" variable. But i want to keep it using a while loop

Current code is:

myLen = int(input("Enter the number of rows: "))
while myLen < 1 or myLen> 40:
      print("The number of rows must be greater than 1 and less than 40")
      myLen = int(input("Enter the number of rows: "))

myNewLen=1
store=myLen
while myNewLen <=store:
      print((" "*(myLen-1))+"*" * myNewLen)
      myNewLen=myNewLen+1
      myLen=myLen-1

Which will print out a result of:

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

I was wondering how i could simplify this code for efficiency.

Also for bug free optimization questions maybe consider posting here: codereview.stackexchange.com — MooingRawr
– MooingRawr, Commented Oct 27, 2016 at 16:40

mattsap · Accepted Answer · 2016-10-27 20:08:15Z

2

Essentially, you still need to keep track of which row you're on and just do a little more math to see how many *'s and " "'s there should be. Hope this helps.

myLen = 5
i = 1
while myLen >= i:
    print( ("*" * i).rjust(myLen) )
    i += 1

edited Oct 27, 2016 at 20:08

answered Oct 27, 2016 at 16:43

mattsap

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2 Comments

Xrin Over a year ago

Ah i see, this makes a lot of sense, simple and clear to the point. Thanks!

asongtoruin Over a year ago

Personal preference perhaps, but I think it'd be even neater to use rjust - the print line would then become print(("*" * i).rjust(myLen))

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