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How to Print Pattern in Python

In Python, for loop is used to print the various patterns. Printing the various patterns are most common asked programming questions in the interview. The multiple for loops are used to print the patterns where the first outer loop is used to print the number of rows, and the inner loop is used to print the number of columns. Most of the patterns use the following concepts.

The outer loop to print the number of rows.
The inner loops to print the number of columns.
The variable to print whitespace according to the required place in Python.

In this tutorial, we will discuss a few common patterns.

Print Pyramid, Star, and diamond pattern in Python

In this section, we will learn the common pyramid patterns.

Pattern - 1: Simple pyramid pattern

Example -

# Simple Python program to print the Simple pyramid pattern 
n = int(input("Enter the number of rows"))     
# Here, we are declaring the integer variable to store the input rows
# Here, we are declaring an outer loop to handle number of rows  
for i in range(0, n):  
    # Here, we are declaring an inner loop to handle number of columns  
    # Here, the values are changing according to outer loop  
        for j in range(0, i + 1):  
            # Here, we are declaring a for loop for printing stars  
            print("* ", end="")     
        # Here, we are giving the ending line after each row  
        print()  

Output:

Enter the number of rows: 5
* 
* * 
* * * 
* * * * 
* * * * *

Explanation:

In the above code, we have initialized the n variable to enter the number of rows for the pattern. We entered n = 5, the range of outer for loop will be 0 to 4.

The iteration of the inner for loop depends on the outer loop. The inner loop is responsible to print the number of columns.
In the first iteration, the value of i is 0, and it increased by 1, so it becomes 0+1, now inner loop iterated first time and print one star(*).
In the second iteration, the value of i is 1 and it increased by 1, so it becomes 1+1, now inner loop iterated two times and print two-star (*).
The end argument prevents to jump into another line. It will printer the star until the loop is valid.
The last print statement is responsible for ending the line after each row.

Pattern - 2: Reverse right angle pyramid

Example -

# Simple Python program to print the simple reversed right angle pyramid pattern  
rows = int(input("Enter the number of rows:")) 
# Here, we are declaring the integer variable to store the input rows 
k = 2 * rows - 2     # Here, the K is used for number of spaces  
# Here, we are declaring an outer loop to handle number of rows
for i in range(0, rows):  
      # Here, we are declaring an inner loop to handle number of spaces
    for j in range(0, k):  
        print(end=" ")  
    k = k - 2      # Here, we are decrementing the k value after each iteration  
# Here, we are declaring an for loop to handle number of rows    
for j in range(0, i + 1):  
        print("* ", end="")   # Here, we are printing the star pattern  
    print("")  

Output:

Enter the number of rows: 5      
      * 
     * * 
    * * * 
   * * * * 
  * * * * *

Pattern - 3: Printing Downward half - Pyramid

Code -

# Simple Python program to print the simple downward half - pyramid pattern  
rows = int(input("Enter the number of rows:")) 
# Here, we are declaring the integer variable to store the input rows 
# Here, we are declaring the outer for loop for executing in reversed order  
for i in range(rows + 1, 0, -1):    
    for j in range(0, i - 1):     # here, we are declaring the for loop to print the pattern
        print("*", end=' ')  
    print(" ")  

Output:

Enter the number of rows: 5
* * * * *  
* * * *  
* * *  
* *  
*

Pattern - 4: Printing Triangle Pyramid

Code -

# Simple Python program to print the simple triangle pyramid
n = int(input("Enter the number of rows: "))  
# Here, we are declaring the integer variable to store the input rows
m = (2 * n) - 2     # Here, the m is used for number of spaces
# Here, we are declaring an outer loop to handle number of rows
for i in range(0, n):  
     # Here, we are declaring an for loop to handle number of spaces
    for j in range(0, m):  
        print(end=" ")  
    m = m - 1      # Here, we are decrementing the m after each loop  
# Here, we are declaring an outer loop to print the pattern    
for j in range(0, i + 1):  
        # Here, we are printing the full Triangle pyramid using stars  
        print("* ", end=' ')  
    print(" ")  

Output:

Enter the number of rows: 10
                  *   
                 *  *   
                *  *  *   
               *  *  *  *   
              *  *  *  *  *   
             *  *  *  *  *  *   
            *  *  *  *  *  *  *   
           *  *  *  *  *  *  *  *   
          *  *  *  *  *  *  *  *  *   
         *  *  *  *  *  *  *  *  *  *

Pattern - 5: Downward Triangle Pattern

Code -

# Simple Python program to print the simple Downward Triangle Pattern
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))  
# Here, the k variable is used to print the space  
k = 2 * rows - 2  
# Here, we are declaring an outer for loop to handle number of rows 
for i in range(rows, -1, -1):  
    # Here, we are declaring an inner for loop to print the number of space.  
    for j in range(k, 0, -1):  
        print(end=" ")  
    k = k + 1  
    # Here, the inner for loop will be used to print the number of stars  
    for j in range(0, i + 1):  
        print("*", end=" ")  
    print("")  

Output:

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

Pattern - 6: Diamond Shaped Pattern

Code -

# Simple Python program to print the simple Diamond shaped pattern
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))  
# Here, we are using the k variable to print the space  
k = 2 * rows - 2  
# Here, we are declaring an outer for loop to handle number of rows  
for i in range(0, rows):  
    # Here, we are declaring an inner for loop to print the number of spaces 
    for j in range(0, k):  
        print(end=" ")  
    # Here, we are decrementing the k value after each iteration  
    k = k - 1  
# Here, we are declaring an inner for loop to print the pattern  
    for j in range(0, i + 1):  
        print("* ", end="")  
    print("")  
# Here, we are writing the code for Downward triangle Pyramid  
# Here, we are using the k variable to print the space  
k = rows - 2  
# Here, we are declaring the for loop for downward triangle pyramid  
for i in range(rows, -1, -1):  
    # Here, we are declaring an inner for loop to print the pattern  
    for j in range(k, 0, -1):  
        print(end=" ")  
    # Here, we are Incrementing the k value after each iteration  
    k = k + 1  
    # Here, this inner loop will print number of stars  
    for j in range(0, i + 1):  
        print("* ", end="")  
    print("")  
# Here, this print is used for new line after each row to display pattern correctly

Output:

Enter the number of rows: 8
              * 
             * * 
            * * * 
           * * * * 
          * * * * * 
         * * * * * * 
        * * * * * * * 
       * * * * * * * * 
      * * * * * * * * * 
       * * * * * * * * 
        * * * * * * * 
         * * * * * * 
          * * * * * 
           * * * * 
            * * * 
             * * 
              *

Pattern - 7: Print two pyramid in a single pattern

Code -

# Simple Python program to print the simple two pyramid in a single pattern
# Here, we are declaring the integer variable to store the input rows
rows = input("Enter the number of rows: ")  
# Here, we are declaring an outer for loop to handle number of rows 
for i in range(0, rows):  
    # Here, we are declaring an inner for loop to print the stars 
    for j in range(0, i + 1):  
        print("*", end=' ')  
    # Here, we are changing the line after each iteration  
    print(" ")  
# Here, we are creating the code for the second pattern  
for i in range(rows + 1, 0, -1):  
    for j in range(0, i - 1):   
        print("*", end=' ')  
    print(" ") 
# Here, this print is used for new line after each row to display pattern correctly 

Output:

Enter the number of rows: 7
*  
* *  
* * *  
* * * *  
* * * * *  
* * * * * *  
* * * * * * *  
* * * * * * *  
* * * * * *  
* * * * *  
* * * *  
* * *  
* *  
*

Pattern - 8: Hourglass Pattern

Code -

# Simple Python program to print the simple Hourglass pattern
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))  
k = rows - 2      # Here, we are using the k variable to print the space
# Here, we are declaring the for loop that is used to print the downward pyramid  
for i in range(rows, -1 , -1):  
    for j in range(k , 0 , -1):  
     # Here, we are declaring the for loop that is used to print the spaces
        print(end=" ")  
    k = k + 1      # Here, we are incrementing the K value after each iteration
# Here, we are declaring the for loop that is used to print the stars    
for j in range(0, i+1):  
        print("* " , end="")      # Here, we are printing the pattern using the stars
    print()    
k = 2 * rows  - 2
# Here, we are declaring the for loop that is used to print the upward pyramid  
for i in range(0 , rows+1):  
    for j in range(0 , k):  
        print(end="")  
    k = k - 1      # Here, we are decrementing the K value after each iteration
# Here, we are declaring the for loop that is used to print the stars    
for j in range(0, i + 1):  
        print("* ", end="")     # Here, we are printing the pattern using the stars
    print()  
# Here, this print is used for new line after each row to display pattern correctly

Output:

Enter the number of rows: 5
   * * * * * * 
    * * * * * 
     * * * * 
      * * * 
       * * 
        * 
        * 
       * * 
      * * * 
     * * * * 
   * * * * * 
  * * * * * *

We have discussed the basic pyramid pattern using for loops. The concept of the pattern depends on the logic and proper use of for loop.

Number Pattern in Python

In this section, we describe a few programs of different types of number patterns. Let's understand the following patterns one by one.

Pattern - 1: Number Pattern

Code -

# Simple Python program to print the simple number pattern
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))  
# Here, we are declaring the for loop that is used to print the number of rows  
for i in range(rows+1):  
# Here, we are declaring the for loop that is used to print the value of i after each iteration  
    for j in range(i):  
        print(i, end=" ")       # Here, we are printing the number in some pattern  
    # Here, this print is used for new line after each row to display pattern correctly  
    print(" ")  

Output:

Enter the number of rows: 5
1  
2 2  
3 3 3  
4 4 4 4  
5 5 5 5 5

Explanation -

In the above code, we have printed the numbers according to rows value. The first row prints a single number. Next, two numbers, prints in the second row, and the next three number prints on the third row and so on. In the

Pattern - 2: Half pyramid pattern with the number

Code -

# Simple Python program to print the simple half pyramid pattern with the numbers
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))  
# Here, we are declaring the for loop that is used to print the number of rows  
for i in range(1, rows+1):  
    # Here, we are declaring the for loop that is used to print the number of columns   
    for j in range(1, i + 1):  
        print(j, end=' ')  
    print("")  
# Here, this print is used for new line after each row to display pattern correctly

Output:

Enter the number of rows: 5
1 
1 2 
1 2 3 
1 2 3 4 
1 2 3 4 5

In the above code, we have printed the column value j in the inner for loop.

Pattern - 3: Inverted Pyramid Pattern

Code -

# Simple Python program to print the simple inverted pyramid pattern
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: 5"))  
k = 0  
# Here, we are declared the Reversed for loop to print downward inverted pattern  
for i in range(rows, 0, -1):  
    # Here, we are Incrementing the k after each iteration  
    k += 1  
# Here, we are declaring the for loop that is used to print the pattern
    for j in range(1, i + 1):  
        print(k, end=' ')  
    print() 
# Here, this print is used for new line after each row to display pattern correctly 

Output:

Enter the number of rows: 5
1 1 1 1 1 
2 2 2 2 
3 3 3 
4 4 
5

Explanation:

In the above code, we have used the reversed loop to print the downward inverted pyramid where number reduced after each iteration.

Pattern - 4: Same number Inverted Pyramid

Code -

# Simple Python program to print the simple inverted pyramid pattern
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))  
# Here, all the rows value assign to n variable  
n = rows  
# Here, we are declaring the for loop that is used to print the inverted pattern  
for i in range(rows, 0, -1):
# Here, we are declaring the for loop that is used to print the pattern  
    for j in range(0, i):  
        # Here, this for loop is used to print the same number  
        print(n, end=' ')  
    print()  
# Here, this print is used for new line after each row to display pattern correctly

Output:

Enter the number of rows: 6
6 6 6 6 6 6 
6 6 6 6 6 
6 6 6 6 
6 6 6 
6 6 
6

Pattern - 5: Descending Order of Number

Code -

# Simple Python program to print the simple descending order of numbers
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))  
# Here, we are declaring the Downward for loop for inverse loop  
for i in range(rows, 0, -1):  
    n = i      # Here, we are assign the value to n of i after each iteration  
    for j in range(0, i):  
        # Here, we are printing the reduced value in each new line  
        print(n, end=' ')  
    print("\r")  
# Here, this print is used for new line after each row to display pattern correctly

Output:

Enter the number of rows: 6
6 6 6 6 6 6 
5 5 5 5 5 
4 4 4 4 
3 3 3 
2 2 
1

Pattern - 6: Print 1 to 10 numbers in Pattern

Code -

# Simple Python program to print the simple numbers pattern from 1 t0 10
# Here, we are declaring the integer variable current number and storing the value 1
current_Number = 1  
stop = 2  
rows = 3  
# Here, we are declaring the row variable to store Number of rows to print numbers    
for i in range(rows):   # Here, we are declaring the for loop that is used for the rows 
    for j in range(1, stop):   
        print(current_Number, end=' ')# Here, we are printing the number under for loop
        current_Number += 1    # Here, we are incrementing the current number by 1
    print("")  
    stop += 2    # Here, we are incrementing the stop value by 2

Output:

1 
2 3 4 
5 6 7 8 9

Pattern - 7: Reverse Pattern from 10 to 1

Code -

# Simple Python program to print the simple reverse pattern from 1 to 10
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))
# Here, we are declaring the for loop for reverse order print 
for i in range(0, rows + 1):  
    # Here, we are declaring the for loop for decrement in i values  
    for j in range(rows - i, 0, -1):  
        print(j, end=' ')      # Here, we are printing the reverse pattern
    print()  

Output:

Enter the number of rows: 6
6 5 4 3 2 1 
5 4 3 2 1 
4 3 2 1 
3 2 1 
2 1 
1

Pattern - 8: Print Odd Numbers

Code -

# Simple Python program to print the odd number
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))  
i = 1     # here, we are declaring the variable with the value i
# Here, we are declaring the while loop to print number of rows  
while i <= rows:  
    j = 1  
    # Here, we are checking the column after each iteration  
    while j <= i:  
        # Here, we are printing the odd values  
        print((i * 2 - 1), end=" ")  
        j = j + 1      # here, we are incrementing the j value after each iteration
    i = i + 1    # here, we are incrementing the i value after each iteration
    print()  

Output:

Enter the number of rows: 5
1 
3 3 
5 5 5 
7 7 7 7 
9 9 9 9 9

Pattern - 9: Square Pattern using with number

Code -

# Simple Python program to print the square pattern using numbers
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))  
for i in range(1, rows + 1):    # here, we are declaring the for loop
    for j in range(1, rows + 1):    # here, we are declaring the for loop
        # Here, we are checking the condition if value of j is smaller or equal than  
        # the j then print i otherwise print j  
        if j <= i:  
            print(i, end=' ')      # here, we are printing the I value when the condition is true
        else:  
            print(j, end=' ')  # here, we are printing the j value when the condition is false    print()  

Output:

Enter the number of rows: 5
1 2 3 4 5 
2 2 3 4 5 
3 3 3 4 5 
4 4 4 4 5 
5 5 5 5 5

Pattern - 10: Multiplication Number in Column

Example:

# Simple Python program to print the multiplication number in the column
# Here, we are declaring the integer variable to store the input rows
rows = int(input("Enter the number of rows: "))  
for i in range(1, rows):     # here, we are declaring the for loop for the number of rows
    for j in range(1, i + 1):  
        # Here, we are printing the multiplication of the row and column  
        print(i * j, end='  ')  
    print()  

Output:

Enter the number of rows: 8
1  
2  4  
3  6  9  
4  8  12  16  
5  10  15  20  25  
6  12  18  24  30  36  
7  14  21  28  35  42  49

In the above section, we have discussed all the basic number patterns. It will make a strong command on Python for loop. We can any type of pattern using for loop.

Alphabets and Letters Pattern in Python

As we know that the, each alphabet has its own ASCII value, so define a character and print it to the screen. Let's understand these patterns by following examples

Pattern - 1: Right-angled pattern with characters

Code -

print("The character pattern using the ascii value is: ")  
asciiValue = 65     # here, we are giving the ASCII value of A  
for i in range(0, 5):   # here, we are declaring the for loop for I values 
    for j in range(0, i + 1):    # here, we are declaring the for loop for j values
        # Here, the below will convert the ASCII value to the character  
        alphabate = chr(asciiValue)  
        print(alphabate, end=' ')     # Here, we are printing the alphabets
        asciiValue += 1 
# Here, we are incrementing the asciivalue by 1 after each iteration
    print()  

Output:

The character pattern using the ascii value is: 
A 
B C 
D E F 
G H I J 
K L M N O

Explanation -

In the above code, we have assigned the integer value 65 to asciiValue variable which is an ASCII value of A. We defined for loop to print five rows. In the inner loop body, we converted the ASCII value into the character using the char() function. It will print the alphabets, increased the asciiValue after each iteration.

Pattern - 2: Right-angled Pattern with Same Character

Code -

print("The character pattern using the ascii value is: ")  
asciiValue = int(input("Enter the ASCII value to print pattern: "))  
# Here, we are taking the User - define value from the user  
if (asciiValue >= 65 or asciiValue <=122):    
# Here, we are declaring the if condition if it is true then it will enter the if block
    for i in range(0, 5):     # here, we are declaring the for loop in the range from 0 to 5
        for j in range(0, i + 1):  
# Here, we are declaring the for loop in the range from 0 to i+1
            # Here, the below will convert the ASCII value to the character  
            alphabate = chr(asciiValue)  
            print(alphabate, end=' ')    # Here, we are printing the alphabets
        print()  
else:    # here, the else block will be executed if the condition is false
    print("Enter the valid character value")  

Output:

The character pattern using the ascii value is: 
Enter the ASCII value to print pattern: 75
K 
K K 
K K K 
K K K K 
K K K K K

Pattern - 3: Display letter of the word in Pattern

Code -

# Here, we are creating the simple python program to print letter of words in pattern
str1 = "JavaTpoint"   # here, we are declaring the string variable to store the string
x = ""  
for i in str1:     # here, we are declaring the for loop to iterate through str1
    x += i     # here, we are incrementing the x value with the I value after each iteration
    print(x)    # here, we are printing the x value after each iteration

Output:

J
Ja
Jav
Java
JavaT
JavaTp
JavaTpo
JavaTpoi
JavaTpoin
JavaTpoint

We can use any word to print the characters.

Pattern - 5: Equilateral triangle pattern with characters

Code -

print("Print equilateral triangle Pyramid with characters ")  
s = 5  
asciiValue = 65  
m = (2 * s) - 2  
for i in range(0, s):  
    for j in range(0, m):  
        print(end=" ")  
    # Here, we are decreasing the value of after each iteration  
    m = m - 1  
    for j in range(0, i + 1):  
        alphabate = chr(asciiValue)  
        print(alphabate, end=' ')  
        # Here, we are increasing the ASCII number after each iteration  
        asciiValue += 1  
    print()  

Output:

Print equilateral triangle Pyramid with characters 
        A 
       B C 
      D E F 
     G H I J 
    K L M N O

In this article, we have discussed all basic pattern programs. These patterns are commonly asked during the interview and it is also helpful to understand the concept of Python for loop. Once we get the logic of the program, we can print the any pattern using the Python loops.

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