Python

Methods to add a column to an existing CSV File

Add column to csv python: In this article, we will discuss how to add a column to an existing CSV file using csv.reader and csv.DictWriter  classes. Apart from appending the columns, we will also discuss how to insert columns in between other columns of the existing CSV file.

We also include these for beginners:

• Add a list as a column to an existing csv file python
• Add column from one csv to another python
• Add column to existing csv
• Add two columns in csv python
• Add column to csv powershell
• Python csv write to specific row and column
• Add column to existing csv
• Add two columns in csv python
• Add column to csv powershell
• Add a list as a column to an existing csv file python
• Add column from one csv to another python
• Python add a column to an existing csv file
• Python add a new column to csv
• Python add csv column to list
• Python pandas append column to csv
• Add a line to a csv file python

Original CSV file content

from csv import writer
from csv import reader
default_text = 'New column'
# Open the input_file in read mode and output_file in write mode
with open('example1.csv', 'r') as read_obj, \
        open('output_1.csv', 'w', newline='') as write_obj:
    # Create a csv.reader object from the input file object
    csv_reader = reader(read_obj)
    # Create a csv.writer object from the output file object
    csv_writer = writer(write_obj)
    # Read each row of the input csv file as list
    for row in csv_reader:
        # Append the default text in the row / list
        row.append(default_text)
        # Add the updated row / list to the output file
        csv_writer.writerow(row)
output_data=pd.read_csv('output_1.csv')
output_data.head()

from csv import writer
from csv import reader
def add_column_in_csv(input_file, output_file, transform_row):
    """ Append a column in existing csv using csv.reader / csv.writer classes"""
    # Open the input_file in read mode and output_file in write mode
    with open(input_file, 'r') as read_obj, \
            open(output_file, 'w', newline='') as write_obj:
        # Create a csv.reader object from the input file object
        csv_reader = reader(read_obj)
        # Create a csv.writer object from the output file object
        csv_writer = writer(write_obj)
        # Read each row of the input csv file as list
        for row in csv_reader:
            # Pass the list / row in the transform function to add column text for this row
            transform_row(row, csv_reader.line_num)
            # Write the updated row / list to the output file
            csv_writer.writerow(row)
add_column_in_csv('example1.csv', 'output_2.csv', lambda row, line_num: row.append(row[0] + '__' + row[1]))
output_data=pd.read_csv('output_2.csv')
output_data.head()

from csv import writer
from csv import reader
def add_column_in_csv(input_file, output_file, transform_row):
    """ Append a column in existing csv using csv.reader / csv.writer classes"""
    # Open the input_file in read mode and output_file in write mode
    with open(input_file, 'r') as read_obj, \
            open(output_file, 'w', newline='') as write_obj:
        # Create a csv.reader object from the input file object
        csv_reader = reader(read_obj)
        # Create a csv.writer object from the output file object
        csv_writer = writer(write_obj)
        # Read each row of the input csv file as list
        for row in csv_reader:
            # Pass the list / row in the transform function to add column text for this row
            transform_row(row, csv_reader.line_num)
            # Write the updated row / list to the output file
            csv_writer.writerow(row)
l=[]
l.append("New Column")
rows = len(data.axes[0])
for i in range(rows):
    val=i+1
    l.append(val)
add_column_in_csv('example1.csv', 'output_3.csv', lambda row, line_num: row.append(l[line_num - 1]))
output_data=pd.read_csv('output_3.csv')
output_data.head()

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Given the marks of 5 subjects of the student, the task is to display the grade of the student based on the marks in Python.

Read Also: Python Program for Swapping Three Variables Without Using any Temporary Variable.

Examples:

Example1:

Input:

Enter first subject marks as integer = 75
Enter second subject marks as integer = 79
Enter third subject marks as integer = 65
Enter fourth subject marks as integer = 82
Enter fifth subject marks as integer = 63

Output:

Average of 5 marks = 72.8 Grade =C

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Example2:

Input:

Enter first subject marks as integer = 63
Enter second subject marks as integer = 19
Enter third subject marks as integer = 99
Enter fourth subject marks as integer = 85
Enter fifth subject marks as integer = 73

Output:

Average of 5 marks = 67.8 Grade =D

Program to Take in the Marks of 5 Subjects and Display the Grade in Python

There are several ways to calculate the grade of the student based on the marks of 5 subjects in Python some of them are:

• Using IF..elif..else Statements(Static Input)
• Using IF..elif..else Statements (User Input separated by newline)
• Using IF..elif..else Statements and map(),split() functions (User Input separated by spaces)

Method #1:Using IF..elif..else Statements(Static Input)

Approach:

• Give the 5 subject marks as static input and store them in 5 variables.
• Calculate the sum of the 5 subject marks and store it in a variable.
• Divide the sum by 5 to get the average of all the given marks.
• To determine the grade based on the average of the marks, use an if…Elif..else conditions.
• Print the grade.
• The Exit of the Program.

Below is the implementation:

# Give the 5 subject marks as static input and store them in 5 variables.
marks1 = 95
marks2 = 85
marks3 = 89
marks4 = 93
marks5 = 87
# Calculate the sum of the 5 subject marks and store it in a variable.
summarks = marks1+marks2+marks3+marks4+marks5
# Divide the sum of marks by 5 to get the average of all the given marks.
avgmark = summarks/5
# To determine the grade based on the average of the marks, use an if...Elif..else conditions.
if(avgmark >= 90):
    print("Average of 5 marks =", avgmark, 'Grade =A')
elif(avgmark >= 80 and avgmark < 90):
    print("Average of 5 marks =", avgmark, 'Grade =B')
elif(avgmark >= 70 and avgmark < 80):
    print("Average of 5 marks =", avgmark, 'Grade =C')
elif(avgmark >= 60 and avgmark < 70):
    print("Average of 5 marks =", avgmark, 'Grade =D')
else:
    print("Average of 5 marks =", avgmark, 'Grade =E')

Output:

Average of 5 marks = 89.8 Grade =B

Explanation:

• The user must enter 5 different values as static input and store them in different variables.
• Then add together all five marks and divide by five to get the average.
• If the average is more than 90, the grade is displayed as “A.”
• If the average is between 80 and 90, the letter “B” is printed.
• If the average is between 70 and 80, the letter “C” is printed.
• If the average is between 60 and 70, the letter “D” is printed.
• If the average falls below 60, the letter “F” is printed.

Method #2:Using IF..elif..else Statements (User Input separated by newline)

Approach:

• Give the 5 subject marks as user input using int(input()) which converts the string to an integer.
• Store them in 5 separate variables.
• Calculate the sum of the 5 subject marks and store it in a variable.
• Divide the sum by 5 to get the average of all the given marks.
• To determine the grade based on the average of the marks, use an if…Elif..else conditions.
• Print the grade.
• The Exit of the Program.

Below is the implementation:

# Give the 5 subject marks as user input using int(input()) which converts the string to an integer.
# Store them in 5 separate variables.
marks1 = int(input('Enter first subject marks as integer = '))
marks2 = int(input('Enter second subject marks as integer = '))
marks3 = int(input('Enter third subject marks as integer = '))
marks4 = int(input('Enter fourth subject marks as integer = '))
marks5 = int(input('Enter fifth subject marks as integer = '))
# Calculate the sum of the 5 subject marks and store it in a variable.
summarks = marks1+marks2+marks3+marks4+marks5
# Divide the sum of marks by 5 to get the average of all the given marks.
avgmark = summarks/5
# To determine the grade based on the average of the marks, use an if...Elif..else conditions.
if(avgmark >= 90):
    print("Average of 5 marks =", avgmark, 'Grade =A')
elif(avgmark >= 80 and avgmark < 90):
    print("Average of 5 marks =", avgmark, 'Grade =B')
elif(avgmark >= 70 and avgmark < 80):
    print("Average of 5 marks =", avgmark, 'Grade =C')
elif(avgmark >= 60 and avgmark < 70):
    print("Average of 5 marks =", avgmark, 'Grade =D')
else:
    print("Average of 5 marks =", avgmark, 'Grade =E')

Output:

Enter first subject marks as integer = 75
Enter second subject marks as integer = 79
Enter third subject marks as integer = 65
Enter fourth subject marks as integer = 82
Enter fifth subject marks as integer = 63
Average of 5 marks = 72.8 Grade =C

Method #3:Using IF..elif..else Statements and map(),split() functions (User Input separated by spaces)

Approach:

• Give the 5 subject marks as user input separated by spaces using map(), split() functions.
• Store them in 5 separate variables.
• Calculate the sum of the 5 subject marks and store it in a variable.
• Divide the sum by 5 to get the average of all the given marks.
• To determine the grade based on the average of the marks, use an if…Elif..else conditions.
• Print the grade.
• The Exit of the Program.

Below is the implementation:

# Give the 5 subject marks as user input separated by spaces using map(), split() functions.
# Store them in 5 separate variables.
marks1, marks2, marks3, marks4, marks5 = map(int, input(
    'Enter 5 subject marks separated by spaces = ').split())
# Calculate the sum of the 5 subject marks and store it in a variable.
summarks = marks1+marks2+marks3+marks4+marks5
# Divide the sum of marks by 5 to get the average of all the given marks.
avgmark = summarks/5
# To determine the grade based on the average of the marks, use an if...Elif..else conditions.
if(avgmark >= 90):
    print("Average of 5 marks =", avgmark, 'Grade =A')
elif(avgmark >= 80 and avgmark < 90):
    print("Average of 5 marks =", avgmark, 'Grade =B')
elif(avgmark >= 70 and avgmark < 80):
    print("Average of 5 marks =", avgmark, 'Grade =C')
elif(avgmark >= 60 and avgmark < 70):
    print("Average of 5 marks =", avgmark, 'Grade =D')
else:
    print("Average of 5 marks =", avgmark, 'Grade =E')

Output:

Enter 5 subject marks separated by spaces = 45 96 78 99 92
Average of 5 marks = 82.0 Grade =B

Read Also:

1. Python program to create grade calculator?
2. Python program to find grade of a student using if else?
3. Student mark list program in python using for loop?
4. Python program to find average and grade for given marks?
5. Write a program to take in the marks of 5 subjects and display the grade in c?
6. Python program to calculate total marks percentage and grade of a student?
7. Student mark list program in python using function?
8. Student mark list program in python using class?
9. Write a program to enter marks of 5 subjects and calculate percentage and division?
10. Write a program to display student name and marks in python?
11. Python program to create grade calculator?
12. Python program to take in the marks of 5 subjects and display the grade?
13. Write a python program to take in the marks of 5 subjects and display the grade?

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In the previous article, we have discussed Python Program to Find Sum of Geometric Progression Series

Definition of Lucas sequence:

We’ve all heard of the Fibonacci sequence. It is a sequence in which each term is the sum of the two preceding terms. The Lucas sequence is the same as the previous one, but with different starting values. A Fibonacci sequence starts with 0 and 1, whereas a Lucas sequence in python starts with 2 and 1. The other terms in the Lucas sequence are 3, 4, 7, 11, Nth Lucas Number In Python, Lucas Series In Python, Lucas Series In Java and so on.

Given a number ‘n’ and the task is to print the given nth iteration of Lucas Sequence.

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Examples:

Example1:

Input:

n = 6

Output:

The above Given nth iteration of Lucas Sequence =  18

Example 2:

Input:

n = 10

Output:

The above Given nth iteration of Lucas Sequence =  123

Program to Print nth Iteration of Lucas Sequence

Below are the ways to get the given nth Iteration of the Lucas Sequence.

• Using For Loop (Static Input)
• Using For Loop (User Input)

Method #1: Using For Loop  (Static Input)

Approach:

• Give the First term =2 (since the first term in Lucas Sequence is 2 which is a constant) as static input and store it in a variable.
• Give the Second term =1 (since the second term in Lucas Sequence is 1 which is a constant) as static input and store it in another variable.
• Give the number as static input and store it in another variable.
• Loop from ‘1’ to the above given n+1 value (since doesn’t include the last term) range using For loop.
• Inside the loop, get the third term which is the sum of the first and the second term, and store it in a variable.
• Assign the value of the second term to the first term.
• Assign the value of the third term to the second term and come out of For Loop.
• Print the Value of the above given nth iteration of Lucas Sequence(i.e. first term).
• The Exit of the program.

Below is the implementation:

# Give the First term =2 (since the first term in Lucas Sequence is 2 which is a constant)
# as static input and store it in a variable.
fst_trm = 2
# Give the Second term =1 (since the second term in Lucas Sequence is 1 which is a constant)
# as static input and store it in another variable.
secnd_trm = 1
# Give the number as static input and store it in another variable.
gvn_n_vlue = 6
# Loop from '1' to the above given n+1 value (since doesn't include last term) range
# using For loop.
for i in range(1, gvn_n_vlue+1):
 # Inside the loop , get the third term which is the sum of first and the second term
    # and store it in a variable.
    third_trm = fst_trm+secnd_trm
 # Assign the value of second term to the first term.
    fst_trm = secnd_trm
  # Assign the value of the third term to the second term and come out of For Loop.
    secnd_trm = third_trm
# Print the Value of above given nth iteration of Lucas Sequence(i.e. first term).
print("The above Given nth iteration of Lucas Sequence = ", fst_trm)

Output:

The above Given nth iteration of Lucas Sequence =  18

Method #2: Using For Loop  (User Input)

Approach:

• Give the First term =2 (since the first term in Lucas Sequence is 2 which is a constant) as static input and store it in a variable.
• Give the Second term =1 (since the second term in Lucas Sequence is 1 which is a constant) as static input and store it in another variable.
• Give the number as User input and store it in another variable.
• Loop from ‘1’ to the above given n+1 value (since doesn’t include the last term) range using For loop.
• Inside the loop, get the third term which is the sum of the first and the second term, and store it in a variable.
• Assign the value of the second term to the first term.
• Assign the value of the third term to the second term and come out of For Loop.
• Print the Value of the above given nth iteration of Lucas Sequence(i.e. first term).
• The Exit of the program.

Below is the implementation:

# Give the First term =2 (since the first term in Lucas Sequence is 2 which is a constant)
# as static input and store it in a variable.
fst_trm = 2
# Give the Second term =1 (since the second term in Lucas Sequence is 1 which is a constant)
# as static input and store it in another variable.
secnd_trm = 1
# Give the number as User input and store it in another variable.
gvn_n_vlue = int(input("Enter Some Random number = "))
# Loop from '1' to the above given n+1 value (since doesn't include last term) range
# using For loop.
for i in range(1, gvn_n_vlue+1):
 # Inside the loop , get the third term which is the sum of first and the second term
    # and store it in a variable.
    third_trm = fst_trm+secnd_trm
 # Assign the value of second term to the first term.
    fst_trm = secnd_trm
  # Assign the value of the third term to the second term and come out of For Loop.
    secnd_trm = third_trm
# Print the Value of above given nth iteration of Lucas Sequence(i.e. first term).
print("The above Given nth iteration of Lucas Sequence = ", fst_trm)

Output:

Enter Some Random number = 10
The above Given nth iteration of Lucas Sequence = 123

Explore more instances related to python concepts from Python Programming Examples Guide and get promoted from beginner to professional programmer level in Python Programming Language.

Read more: Python Program to Find Vertex, Focus and Directrix of Parabola

Solve these:

1. Print The Nth Lucas Number In Python?
2. Given A Number N, Print The Nth Lucas Numbers python. Numbering Starts From 0?

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Python number to binary string: Given a binary string, the task is to flip the bits in the given binary string in Python.

Examples:

Example1:

Input:

Given Binary string =1101010001001

Output:

The given binary string before flipping bits is [ 1101010001001 ]
The given binary string after flipping bits is [ 0010101110110 ]

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Example2:

Input:

Given Binary string =00110011111

Output:

The given binary string before flipping bits is [ 00110011111 ]
The given binary string after flipping bits is [ 11001100000 ]

Program to Flipping the Binary Bits in Python

Below are the ways to flip the bits in the given binary string in Python.

• Using For loop(Static Input)
• Using For loop(User Input)
• Using replace() function (Static Input)
• Using replace() function (User Input)

If you are new to Java and want to learn the java coding skills too fast. Try practicing the core java programs with the help of the Java basic programs list available.

Method #1: Using For Loop (Static Input)

Approach:

• Give the binary string as static input and store it in a variable.
• Take an empty string(say flipbinary) which is the result after flipping the bits and initialize its value to a null string using “”.
• Traverse the given binary string using For loop.
• If the bit is 1 then concatenate the flipbinary with 0.
• Else concatenate the flipbinary with 1.
• Print the modified binary string after flipping the bits.
• The Exit of the Program.

Below is the implementation:

# Give the binary string as static input and store it in a variable.
gvnbinstring = '1101010001001'
# Take an empty string(say flipbinary) which is the result after flipping the bits
# and initialize its value to a null string using "".
flipbinary = ""
# Traverse the given binary string using For loop.
for bitval in gvnbinstring:
    # If the bit is 1 then concatenate the flipbinary with 0.
    if bitval == '1':
        flipbinary += '0'
    # Else concatenate the flipbinary with 1.
    else:
        flipbinary += '1'
# Print the modified binary string after flipping the bits.
print('The given binary string before flipping bits is [', gvnbinstring, ']')
print('The given binary string after flipping bits is [', flipbinary, ']')

Output:

The given binary string before flipping bits is [ 1101010001001 ]
The given binary string after flipping bits is [ 0010101110110 ]

Method #2: Using For Loop (User Input)

Approach:

• Give the binary string as user input using input() and store it in a variable.
• Take an empty string(say flipbinary) which is the result after flipping the bits and initialize its value to a null string using “”.
• Traverse the given binary string using For loop.
• If the bit is 1 then concatenate the flipbinary with 0.
• Else concatenate the flipbinary with 1.
• Print the modified binary string after flipping the bits.
• The Exit of the Program.

Below is the implementation:

# Give the binary string as user input using input() and store it in a variable.
gvnbinstring = input('Enter some random binary string = ')
# Take an empty string(say flipbinary) which is the result after flipping the bits
# and initialize its value to a null string using "".
flipbinary = ""
# Traverse the given binary string using For loop.
for bitval in gvnbinstring:
    # If the bit is 1 then concatenate the flipbinary with 0.
    if bitval == '1':
        flipbinary += '0'
    # Else concatenate the flipbinary with 1.
    else:
        flipbinary += '1'
# Print the modified binary string after flipping the bits.
print('The given binary string before flipping bits is [', gvnbinstring, ']')
print('The given binary string after flipping bits is [', flipbinary, ']')

Output:

Enter some random binary string = 0011100110101010
The given binary string before flipping bits is [ 0011100110101010 ]
The given binary string after flipping bits is [ 1100011001010101 ]

Method #3: Using replace() function (Static Input)

Approach:

• Give the binary string as static input and store it in a variable.
• Replace all 1’s present in the given binary string with some random character like p.
• Replace all 0’s present in the given binary string with 1.
• Replace all p’s present in the given binary string with 0.
• Here ‘p’ acts as a temporary variable.
• Print the modified binary string after flipping the bits.
• The Exit of the Program.

Below is the implementation:

# Give the binary string as static input and store it in a variable.
gvnbinstring = '1101010001001'

# Replace all 1's present in the given binary string
# with some random character like p.
flipbinary = gvnbinstring.replace('1', 'p')
# Replace all 0's present in the given
# binary string with 1.
flipbinary = flipbinary.replace('0', '1')
# Replace all p's present in the given
# binary string with 0.
# Here 'p' acts as a temporary variable.
flipbinary = flipbinary.replace('p', '0')
# Print the modified binary string after flipping the bits.
print('The given binary string before flipping bits is [', gvnbinstring, ']')
print('The given binary string after flipping bits is [', flipbinary, ']')

Output:

The given binary string before flipping bits is [ 1101010001001 ]
The given binary string after flipping bits is [ 0010101110110 ]

Method #4: Using replace() function (User Input)

Approach:

• Give the binary string as user input using input() and store it in a variable.
• Replace all 1’s present in the given binary string with some random character like p.
• Replace all 0’s present in the given binary string with 1.
• Replace all p’s present in the given binary string with 0.
• Here ‘p’ acts as a temporary variable.
• Print the modified binary string after flipping the bits.
• The Exit of the Program.

Below is the implementation:

# Give the binary string as user input using input() and store it in a variable.
gvnbinstring = input('Enter some random binary string = ')

# Replace all 1's present in the given binary string
# with some random character like p.
flipbinary = gvnbinstring.replace('1', 'p')
# Replace all 0's present in the given
# binary string with 1.
flipbinary = flipbinary.replace('0', '1')
# Replace all p's present in the given
# binary string with 0.
# Here 'p' acts as a temporary variable.
flipbinary = flipbinary.replace('p', '0')
# Print the modified binary string after flipping the bits.
print('The given binary string before flipping bits is [', gvnbinstring, ']')
print('The given binary string after flipping bits is [', flipbinary, ']')

Output:

Enter some random binary string = 00110011111
The given binary string before flipping bits is [ 00110011111 ]
The given binary string after flipping bits is [ 11001100000 ]

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Max element in list python: In the previous article, we have discussed Python Program to Find Vertex, Focus and Directrix of Parabola
max() function :

max() is a built-in function that returns the maximum value in a list.

index() function:

This function searches the lists. It returns the index where the value is found when we pass it as an argument that matches the value in the list. If no value is found, Value Error is returned.

Given a list, the task is to Get the position of Max Value in a List.

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Examples:

Example 1 :

Input :

Given List = [1, 5, 9, 2, 7, 3, 8]

Output:

Maximum Value in the above Given list = 9
Position of Maximum value of the above Given List = 3

Example 2 :

Input : 

Given List = [4, 3, 7, 1, 2, 8, 9]

Output:

Maximum Value in the above Given list = 9
Position of Maximum value of the above Given List = 7

Program to Get the Position of Max Value in a List

Below are the ways to Get the Position of Max value in a List.

• Using Max(),Index() functions (Static Input)
• Using Max(),Index() functions (User Input)

Method #1: Using Max(),Index() functions  (Static Input)

Approach:

• Give the List as static input and store it in a variable.
• Get the maximum value of the given list using the built-in max() function and store it in another variable.
• Print the maximum value of the above-given List.
• Get the position of the maximum value of the given List using the built-in index() function and store it in another variable.
• Print the position of the maximum value of the given List i.e. maximum position+1( since list index starts from zero).
• The Exit of the program.

Below is the implementation:

# Give the List as static input and store it in a variable.
Gvn_lst = [1, 5, 9, 2, 7, 3, 8]
# Get the maximum value of the given list using the built-in max() function and
# store it in another variable
maxim_vle = max(Gvn_lst)
# Print the maximum value of the above given List.
print("Maximum Value in the above Given list = ", maxim_vle)
# Get the position of the maximum value of the List using the built-in index() function
# and store it in another variable.
maxim_positn = Gvn_lst.index(maxim_vle)
# Print the position of the maximum value of the given List i.e. maximum position+1
# ( since list index starts from zero).
print("Position of Maximum value of the above Given List = ", maxim_positn+1)

Output:

Maximum Value in the above Given list =  9
Position of Maximum value of the above Given List =  3

Method #2: Using Max(),Index() functions  (User Input)

Approach:

• Give the list as User input using list(),map(),input(),and split() functions and store it in a variable.
• Get the maximum value of the given list using the built-in max() function and store it in another variable.
• Print the maximum value of the above-given List.
• Get the position of the maximum value of the given List using the built-in index() function and store it in another variable.
• Print the position of the maximum value of the given List i.e. maximum position+1( since list index starts from zero).
• The Exit of the program.

Below is the implementation:

#Give the list as User input using list(),map(),input(),and split() functions and store it in a variable.
Gvn_lst = list(map(int, input('Enter some random List Elements separated by spaces = ').split()))
# Get the maximum value of the given list using the built-in max() function and
# store it in another variable
maxim_vle = max(Gvn_lst)
# Print the maximum value of the above given List.
print("Maximum Value in the above Given list = ", maxim_vle)
# Get the position of the maximum value of the List using the built-in index() function
# and store it in another variable.
maxim_positn = Gvn_lst.index(maxim_vle)
# Print the position of the maximum value of the given List i.e. maximum position+1
# ( since list index starts from zero).
print("Position of Maximum value of the above Given List = ", maxim_positn+1)

Output:

Enter some random List Elements separated by spaces = 4 3 7 1 2 8 9
Maximum Value in the above Given list = 9
Position of Maximum value of the above Given List = 7

Here we printed the index of the maximum element of the given list.

Explore more instances related to python concepts from Python Programming Examples Guide and get promoted from beginner to professional programmer level in Python Programming Language.

• Python Program to Get n Random Items from a List
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• Python Program to Print Items from a List with Specific Length
• Python Program to Delete Random Item from a List

Pattern program in python: Beginners and experienced programmers can rely on these Best Java Programs Examples and code various basic and complex logics in the Java programming language with ease.

Python Program to Print the pattern of an Inverted Star: Given a number, the task is to print an Inverted Star Pattern in Python. In our python programming articles, you can also learn how to print a program of Inverted pyramid pattern and print inverted pyramid star pattern in python language.

Let’s see the examples of python program to print inverted star pattern from here

• Python Program to Print Inverted Pyramid Pattern with the Same Digit
• Python Program to Print Inverted Right Triangle Star Pattern
• Python Program to Print Hollow Inverted Right Triangle

Example1:

Input:

given rows = 8

Output:

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

Example2:

Input:

given rows=10

Output:

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

Here is the program to print Inverted Star Pattern:

# python 3 code to print inverted star
# pattern 
  
# n is the number of rows in which
# star is going to be printed.
n=11
  
# i is going to be enabled to
# range between n-i t 0 with a
# decrement of 1 with each iteration.
# and in print function, for each iteration,
# ” ” is multiplied with n-i and ‘*’ is
# multiplied with i to create correct
# space before of the stars.
for i in range (n, 0, -1):
    print((n-i) * ' ' + i * '*')

Program to Print an Inverted Star Pattern in Python

Below are the ways to print an Inverted Star Pattern in  Python :

• Using for loop printing the inverted star pattern in Python (Static Input)
• Using for loop printing the inverted star pattern in Python (User Input)
• Using while loop printing the inverted star pattern in Python (Static Input)
• Using while loop printing the inverted star pattern in Python (User Input)
• Programs to print inverted half pyramid using *

Drive into Python Programming Examples and explore more instances related to python concepts so that you can become proficient in generating programs in Python Programming Language.

1)Using for loop printing the inverted star pattern in Python(Static Input)

Approach:

• Give the number as static and store it in a variable
• Use a for loop in which the value of k varies between n-1 and 0 and is decremented by one with each iteration.
• Multiply empty spaces by n-i and ‘*’ by k then print both of them.
• Exit of program.

Below is the implementation:

# given number numb
numb = 8
# Use a for loop in which the value of k varies
# between n-1 and 0 and is decremented by one with each iteration.
for k in range(numb, 0, -1):
  # Multiply empty spaces by n-i and '*' by k then print both of them.
    print((numb-k) * ' ' + k * '*')

Output:

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

Explanation:

• Give the number as static and stored it in  a variable numb
• The for loop allows I to range between n-1 and 0, with each iteration decrementing by one.
• To maintain proper star spacing, ” ” is multiplied by n-i and ‘*’ is multiplied by I for each iteration.
• The requisite pattern has been printed.

2)Using for loop printing the inverted star pattern in Python(User Input)

Approach:

• Scan the given number using int(input()) and store it in a variable.
• Use a for loop in which the value of k varies between n-1 and 0 and is decremented by one with each iteration.
• Multiply empty spaces by n-i and ‘*’ by k then print both of them.
• Exit of program.

Below is the implementation:

# given number numb
numb = int(input("enter the number of rows required = "))
# Use a for loop in which the value of k varies
# between n-1 and 0 and is decremented by one with each iteration.
for k in range(numb, 0, -1):
  # Multiply empty spaces by n-i and '*' by k then print both of them.
    print((numb-k) * ' ' + k * '*')

Output:

enter the number of rows required = 10
**********
 *********
  ********
   *******
    ******
     *****
      ****
       ***
        **
         *

3)Using while loop printing the inverted star pattern in Python(Static Input)

Approach:

• Give the number as static and store it in a variable
• Using while loop iterate till number is greater than 0.
• Multiply empty spaces by tem-i and ‘*’ by numb then print both of them.
• Decrement the number by 1.
• The Exit of the program.

Below is the implementation:

# given number numb
numb = 10
# Make a duplicate of the integer by storing it in a variable
tem = numb
# Use a for loop in which the value of k varies
# between n-1 and 0 and is decremented by one with each iteration.
while(numb > 0):
  # Multiply empty spaces by n-i and '*' by k then print both of them.
    print((tem-numb) * ' ' + numb * '*')
    # decrement the number by 1
    numb = numb-1

Output:

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

4)Using while loop printing the inverted star pattern in Python(User Input)

Approach:

• Scan the given number using int(input()) and store it in a variable.
• Using while loop iterate till number is greater than 0.
• Multiply empty spaces by tem-i and ‘*’ by numb then print both of them.
• Decrement the number by 1.
• Exit of program.

Below is the implementation:

# given number numb
numb = int(input("enter the number of rows required = "))
# Make a duplicate of the integer by storing it in a variable
tem = numb
# Use a for loop in which the value of k varies
# between n-1 and 0 and is decremented by one with each iteration.
while(numb > 0):
  # Multiply empty spaces by n-i and '*' by k then print both of them.
    print((tem-numb) * ' ' + numb * '*')
    # decrement the number by 1
    numb = numb-1

Output:

enter the number of rows required = 10
**********
 *********
  ********
   *******
    ******
     *****
      ****
       ***
        **
         *

Programs to print inverted half pyramid using *

This instance is similar to an upright pyramid but that here we begin from the total number of rows and in each iteration, we decrease the number of rows by 1.

Source Code:

rows = int(input("Enter number of rows: "))

for i in range(rows, 0, -1):
    for j in range(0, i):
        print("* ", end=" ")
    
    print("\n")

output: 

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

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