# 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

#### Ajitesh Shukla

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