Patterns can be printed in python using simple for loops. First outer loop is used to handle number of rows and Inner nested loop is used to handle the number of columns. Manipulating the print statements, different number patterns, alphabet patterns or star patterns can be printed.
Some of the Patterns are shown in this article.
- Simple pyramid pattern
# Python 3.x code to demonstrate star pattern
# Function to demonstrate printing pattern
def pypart(n):
# outer loop to handle number of rows
# n in this case
for i in range(0, n):
# inner loop to handle number of columns
# values changing acc. to outer loop
for j in range(0, i+1):
# printing stars
print("* ",end="")
# ending line after each row
print("r")
# Driver Code
n = 5
pypart(n)
Output
*
* *
* * *
* * * *
* * * * *
Another Approach:
Using List in Python 3, this could be done in a simpler way
# Python 3.x code to demonstrate star pattern
# Function to demonstrate printing pattern
def pypart(n):
myList = []
for i in range(1,n+1):
myList.append("*"*i)
print("n".join(myList))
# Driver Code
n = 5
pypart(n)
Output
*
**
***
****
*****
After 180 degree rotation
# Python 3.x code to demonstrate star pattern
# Function to demonstrate printing pattern
def pypart2(n):
# number of spaces
k = 2*n - 2
# outer loop to handle number of rows
for i in range(0, n):
# inner loop to handle number spaces
# values changing acc. to requirement
for j in range(0, k):
print(end=" ")
# decrementing k after each loop
k = k - 2
# inner loop to handle number of columns
# values changing acc. to outer loop
for j in range(0, i+1):
# printing stars
print("* ", end="")
# ending line after each row
print("r")
# Driver Code
n = 5
pypart2(n)
Output
*
* *
* * *
* * * *
* * * * *
Printing Triangle
# Python 3.x code to demonstrate star pattern
# Function to demonstrate printing pattern triangle
def triangle(n):
# number of spaces
k = n - 1
# outer loop to handle number of rows
for i in range(0, n):
# inner loop to handle number spaces
# values changing acc. to requirement
for j in range(0, k):
print(end=" ")
# decrementing k after each loop
k = k - 1
# inner loop to handle number of columns
# values changing acc. to outer loop
for j in range(0, i+1):
# printing stars
print("* ", end="")
# ending line after each row
print("r")
# Driver Code
n = 5
triangle(n)
Output
*
* *
* * *
* * * *
* * * * *
Number Pattern
# Python 3.x code to demonstrate star pattern
# Function to demonstrate printing pattern of numbers
def numpat(n):
# initialising starting number
num = 1
# outer loop to handle number of rows
for i in range(0, n):
# re assigning num
num = 1
# inner loop to handle number of columns
# values changing acc. to outer loop
for j in range(0, i+1):
# printing number
print(num, end=" ")
# incrementing number at each column
num = num + 1
# ending line after each row
print("r")
# Driver code
n = 5
numpat(n)
Output
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
Numbers without reassigning
# Python 3.x code to demonstrate star pattern
# Function to demonstrate printing pattern of numbers
def contnum(n):
# initializing starting number
num = 1
# outer loop to handle number of rows
for i in range(0, n):
# not re assigning num
# num = 1
# inner loop to handle number of columns
# values changing acc. to outer loop
for j in range(0, i+1):
# printing number
print(num, end=" ")
# incrementing number at each column
num = num + 1
# ending line after each row
print("r")
n = 5
# sending 5 as argument
# calling Function
contnum(n)
Output
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
Character Pattern
# Python 3.x code to demonstrate star pattern
# Function to demonstrate printing pattern of alphabets
def alphapat(n):
# initializing value corresponding to 'A'
# ASCII value
num = 65
# outer loop to handle number of rows
# 5 in this case
for i in range(0, n):
# inner loop to handle number of columns
# values changing acc. to outer loop
for j in range(0, i+1):
# explicitely converting to char
ch = chr(num)
# printing char value
print(ch, end=" ")
# incrementing number
num = num + 1
# ending line after each row
print("r")
# Driver Code
n = 5
alphapat(n)
Output
A
B B
C C C
D D D D
E E E E E
Continuous Character pattern
# Python code 3.x to demonstrate star pattern
# Function to demonstrate printing pattern of alphabets
def contalpha(n):
# initializing value corresponding to 'A'
# ASCII value
num = 65
# outer loop to handle number of rows
- for i in range(0, n):
# inner loop to handle number of columns
# values changing acc. to outer loop
for j in range(0, i+1):
# explicitely converting to char
ch = chr(num)
# printing char value
print(ch, end=" ")
# incrementing at each column
num = num +1
# ending line after each row
print("r")
# Driver code
n = 5
contalpha(n)
Output:
A
B C
D E F
G H I J
K L M N O