Python Tutorial

Python offers basic for loops for printing patterns. The first outer loop manages the number of rows, while the inner nested loop manages the number of columns. By modifying the print statements, new number patterns, word patterns, and star patterns could be printed.

This article illustrates a few of the patterns.

1. Simple Pyramid Pattern

# Python 3.x code for star pattern demonstration Printing pattern demonstration #function
def pypart(a):
    # outer loop in this case to manage the number of rows
    for i in range(0, a):
        # Inner loop to manage values changing according to the outer loop's number # of columns.
        for j in range(0, i+1):
            # printing up stars
            print("* ",end="")
        # final line following each row
        print("\r")
# Driver Code
a = 5
pypart(a)

Output

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

2. Python 3's List feature would make this process simpler.

# Star pattern demonstration in Python 3.x # Displays a printing pattern in action
def pypart(a):
    myList1 = []
    for i in range(1, a+1):
        myList.append("*"*i)
    print("\n".join(myList1))
# Driver Code
a = 5
pypart(a)

Output

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

3. Recursion Method

# Pyramid pattern printing in Python 3 using recursion
def pypart(a):
	if a == 0:
		return
	else:
		pypart(a-1)
		print("* "*a)
# Driver Code
n = 5
pypart(n)

Output

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

4. While Loop Using

# Pyramid pattern printing in Python 3 with while loop
a=5
i=1; j=0
# Until the condition becomes false in the while loop, the condition is checked. # If it is true, enter the loop & print the pattern.
while(i<=a):
    while(j<=i-1):
        print("* ",end="")
        j+=1
     # printing the subsequent row's line
    print("\r")
    j=0;i+=1

Output

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

5. Rotation Method with 180 degrees

# Star pattern demonstration in Python 3.x # Displays a printing pattern in action
def pypart2(a):
    # number of spaces
    s = 2*s - 2
    # row count is handled by an outer loop.
    for i in range(0, a):
# inner loop for handling number spaces and changing values in accordance with # requirements
        for j in range(0, s):
            print(end=" ")
        # decrementing s after each loop
        s = s - 2
        # Inner loop to handle the amount of columns and any values that change 
# according to the outer loop.
        for n in range(0, m+1):
            # printing up stars
            print("* ", end="")
        # ending up the line after each row
        print("\r")
# Driver Code
a = 5
pypart2(a)

Output

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

6. Printing Triangle

# Star pattern demonstration in Python 3.x 
# Triangle serving as an example of a printing pattern
def triangle(s):
	# Number of spaces to be noted
	a = b - 1
	# Outer loop to handle number of rows
	for m in range (0, b):
		# inner loop to handle number spaces
		# values changing acc. to requirement
		for n in range(0, a):
			print(end=" ")
		# decrementing a after each loop
		a = a - 1
# To handle the number of columns and the changing values according to the
 # outer loop, use an inner loop.
		for n in range(0, m+1):
			# printing up the stars
			print("* ", end="")
		# ending the line after each the row
		print("\r")
# Driver Code
b = 5
triangle(b)

Output

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

7. Number Pattern

# Star pattern demonstration in Python 3.x Function to display the number 
def numpat(s):	
	# Initialising of starting number
	num = 1
	# outer loop to be handle number of rows
	for m in range(0, n):
		# re assigning num1
		Num1 = 1
		# inner loop to be handled  at number of columns
		# values changing to acc. to outer loop
		for n in range(0, m+1):	
				# printing up number
			print(num1, end=" ")
			# incrementing the number at each column
			Num1 = num1 + 1
		# ending up line after each row
		print("\r")
# Driver code
s = 5
numpat(s)

Output