How to easily print triangle patterns in python

 

Printing of patterns is one of the toughest jobs for the beginners and I am gonna show you how to easily print patterns using some basic concepts of text alignment in python.


In Python, a string of text can be aligned left, right and center by use of following functions.

.ljust(width)

This method returns a left aligned string of length width.

width = 15
print ('Spiderlabweb'.ljust(width,'-')

 

Output:

>>Spiderlabweb——-

As you can see that Spiderlabweb is shifted to left by 3 places because length of ‘Spiderlabweb ‘ is 12 and 15-12=3

.center(width)

This method returns a centered string of length width.

>>> width = 16
>>> print 'Spiderlabweb'.center(width,'-')

Output:

>>–Spiderlabweb–

As you can see that Spiderlabweb is shifted to 2 places to the right and 2 places to the left because  16-12=4 therfore 2 from left and two from right

.rjust(width)

This method returns a right aligned string of length width.

>>> width = 15
>>> print 'Spiderlabweb'.rjust(width,'-')

 

Output:

>>—Spiderlabweb

Similar to .ljust(width)

Right Angle Triangle Pattern:

The pattern in which one side is perpendicular to other and here is the code:

side = int(input())
c = '*'
for i in range(side):
    print((c*(i+1)).ljust(side-1))

Inverted Right Angle Triangle Pattern:

The inverted pattern for right angle triangle :

side = int(input())
c = '*'
for i in range(side-1,-1,-1):
    print((c*(i+1)).ljust(side-1))



Isosceles Triangle Pattern:

An isosceles triangle has two sides equal and here is the code for it:

side = int(input()) 
c = '*' 
for i in range(side):
    print((c*i).rjust(side-1)+c+(c*i).ljust(side-1))

Inverted Isosceles Triangle Pattern:

The  code for it is :

side = int(input()) 
c = '*'
for i in range(side-1,-1,-1):
    print((c*i).rjust(side-1)+c+(c*i).ljust(side-1))

 



For more Python Examples click on the link below:

http://spiderlabweb.com/python-programs

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Ajitesh Shukla

Ajitesh Shukla

Tech Expert at SpiderLabWeb
Extremely diligent about new technology and their working. Loves to work on OS development and Internet of Things. Also,interested in competitive coding.
Ajitesh Shukla

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