Atharv Sqa, Author At SQA Tools

3. Problem to remove an element from set

In this Python set program, we will remove an element from set and print the set to see the result with the help of the below-given steps.

What is set?
Sets are used to store multiple items in a single variable.
The set is one of 4 built-in data types in Python used to store collections of data.
It is an unordered collection data type that is iterable, mutable and has no duplicate elements.

Remove an element from set:

Steps to solve the program

1. Create a set using {}.
2. Add some elements in the set.
3. Remove an element from the set using remove() function.
4. Print the output.

				
					a = {1,2,3,5,6}
print("Original set: ",a)
a.remove(5)
print("New set: ",a)

Output :

				
					Original set:  {1, 2, 3, 5, 6}
New set:  {1, 2, 3, 6}

Python program to find the length of a set.

Python program to check if an element is present in a set.

Python program to find the union of two sets.

Python program to find the intersection of two sets.

Python program to find the difference of two sets.

Python program to find the symmetric difference of two sets.

add an element to a set.

find the length of a set.

2. Problem to add elements to set in python

In this Python set program, we will add elements to set in Python and print the set to see the result with the help of the below-given steps.

Add elements to set:

Steps to solve the program

Create a set using {}.
Add some elements in the set.
Add an element in the set using add() function.
Print the output.

				
					a = {1,2,3,5,6}
print("Original set: ",a)
a.add(7)
print("New set: ",a)

Output :

				
					Original set:  {1, 2, 3, 5, 6}
New set:  {1, 2, 3, 5, 6, 7}

Python program to remove an element from a set.

Python program to find the length of a set.

Python program to check if an element is present in a set.

Python program to find the union of two sets.

Python program to find the intersection of two sets.

Python program to find the difference of two sets.

create a set with some elements.

remove an element from a set.

1. Problem to create a set in Python

In this Python set program, we will create a set in Python and add some elements in it as an example with the help of the below-given steps.

Create a set in Python:

Steps to solve the program

Create a set using {}.
Add some elements to the set.
Print the set.

				
					a = {1,2,3,5,6}
print("Set: ",a)

Output :

				
					Set:  {1, 2, 3, 5, 6}

Python program to add an element to a set.

Python program to remove an element from a set.

Python program to find the length of a set.

Python program to check if an element is present in a set.

Python program to find the union of two sets.

Python program to find the intersection of two sets.

add an element to a set.

Python file program to replace space by an underscore in a file

In this python file program, we will replace space by an underscore in a file with the help of the below-given steps. Let’s consider we have readcontent.txt file with the below content.

				
					#readcontent.txt
My name is john.
I'm 20 years old.
I'm learning python at sqatools.
I'm from Australia.

Steps to solve the program

Open the first file using open(“readcontent.txt”,”r”).
Read the data in the file using read().
Replace the space in the data with “_” using replace() and store the output in the new variable.
Open the second file using open(“writecontent.txt”,”w”).
Write the new data in the second file using write().

				
					# Open file in read mode
f1=open("readcontent.txt","r")
# Read data
data=f1.read()
# Replace space by underscore
data=data.replace(" ","_")
# Open file in write mode
f2=open("file2.txt","w")
# Write new data to file
f2.write(data)

Output: Open the writecontent.txt file to see the ouput.

My_name_is_john.
I’m_20_years_old.
I’m_learning_python_at_sqatools.
I’m_from_Australia.

display words from a file that has less than 5 characters.

Program to display words from a file that has less than 5 characters

In this python file program, we will display words from a file that has less than 5 characters with the help of the below-given steps. Let’s consider we have readcontent.txt file with the below content.

				
					#readcontent.txt
My name is john.
I'm 20 years old.
I'm learning python at sqatools.
I'm from Australia.

Steps to solve the program

Open the file by using open(“readcontent.txt”).
Where the file name is the name of the file.
Read the data and split it into words using file.read().split().
Use a for loop to iterate over the words.
If the length of the word is less than 5 then print that word.
Use an if statement for this purpose.

				
					# Open the file
file = open('readcontent.txt')
# Read data and converting it into words
words = file.read().split()
# Iterate over words
for word in words:
# Check for words having length less than 5
    if len(word)<5:
    # Print output
        print(word,end=" ")

Output:

My name is I’m 20 old. I’m at I’m from

remove all the lines that contain the character ‘t’ in a file and write it to another file.

replace space by an underscore in a file.

Program to remove specific line in a file and write it to another file

In this python file program, we will remove specific line in a file and write it to another file with the help of the below-given steps. Let’s consider we have readcontent.txt file with the below content.

				
					#readcontent.txt
My name is john.
I'm 20 years old.
I'm learning python at sqatools.
I'm from Australia.

Steps to solve the program

Open the first file in the reading mode using open(‘readcontent.txt’,’r’).
Open the second file in the append mode using open(‘writecontent.txt’,’a’).
Read the lines of the file using readlines().
Use a for loop to iterate over the lines.
Using an if statement to check whether ‘t’ is in the line or not.
If yes then add that line to the second file using write().
Now close both files.

				
					# open file read mode
f1=open('readcontent.txt','r')
# open file in append mode
f2=open('writecontent.txt','a')
# Read lines from the file
lines=f1.readlines()
# Iterate over lines
for line in lines:
# Check for t in the lines
    if 't' in line:
    # Write lines to writecontent.txt file
        f2.write(line)
# Close the file
f1.close()
f2.close()

Output : Open writecontent.txt file to see the output.

I’m learning python at sqatools.
I’m from Australia.

count the total number of consonants in a file.

display words from a file that has less than 5 characters.

Program to count the total number of consonants in a file

In this python file program, we will count the total number of consonants in a file with the help of the below-given steps. Let’s consider we have readcontent.txt file with the below content.

				
					#readcontent.txt
Line1 : This is India.
Line2 : This is America.
Line3 : This is Canada.
Line4 : This is Australia.

Steps to solve the program

Open the first file by using open(“readcontent.txt”).
Read the data and split it into words using file.read().split().
Create a list of vowels.
Create a count variable and assign its value equal to 0.
Use a for loop to iterate over the words.
Use a nested for loop to iterate over the characters in the word.
Check whether the character is not in the vowels list using an if statement.
If yes then add 1 to the count variable.
Print the output.

				
					# Open file
file = open('readcontent.txt')
# Read data and converting into words
words = file.read().split()
# Create a list of vowels
vowels = ['a','e','i','o','u','A','E','I','O','U']
# Create count variable
count = 0
# Iterate over words
for word in words:
# Iterate over characters in the word
    for char in word:
    # Check for consonants
        if char not in vowels:
    # Add 1 to the count variable for each consonant
            count += 1
# Print output
print("Total number of consonants in the file: ",count)

Output :

Total number of consonants in the file: 48

count the total number of vowels in a file.

remove all the lines that contain the character ‘t’ in a file and write it to another file.

Program to count the total number of vowels in a file

In this python file program, we will count the total number of vowels in a file with the help of the below-given steps. Let’s consider we have readcontent.txt file with the below content.

				
					#readcontent.txt
Line1 : This is India.
Line2 : This is America.
Line3 : This is Canada.
Line4 : This is Australia.

Steps to solve the program

Open the first file by using open(“readcontent.txt”).
Read the data and split it into words using file.read().split().
Create a list of vowels.
Create a count variable and assign its value equal to 0.
Use a for loop to iterate over the words.
Use a nested for loop to iterate over the characters in the word.
Check whether the character is in the vowels list using an if statement.
If yes then add 1 to the count variable.
Print the output.

				
					# Open file
file = open('readcontent.txt')
# Read data and converting it into words
words = file.read().split()
# Create list of vowels
vowels = ['a','e','i','o','u','A','E','I','O','U']
# Create count variable
count = 0
# Iterate over words
for word in words:
# Iterate over characters in the word
    for char in word:
    # Check for vowels
        if char in vowels:
    # Add 1 to the count variable for each vowel
            count += 1
# Print output
print("Total number of vowels in the file: ",count)

Output :

Total number of vowels in the file: 31

count the total number of consonants in a file.

Program to read the content of the file in reverse order

In this python file program, we will read the content of the file in reverse order with the help of the below-given steps. Let’s consider we have readcontent.txt file with the below content.

				
					#readcontent.txt
Line1 : This is India.
Line2 : This is America.
Line3 : This is Canada.
Line4 : This is Australia.

Steps to solve the program

Open the first file by using open(“readcontent.txt”).
Read the data in the file using read().
Convert it to a list using list().
Now reverse the list using reversed().
Use a for loop to iterate over the lines in the reversed list and print the line.

				
					# Open file
file = open('readcontent.txt')
# Read lines and converting it to a list
data = list(file.readlines())
# Iterate over lines in reverse order
for line in reversed(data):
    print(line)

Output :

Line4 : This is Australia.

Line3 : This is Canada.

Line2 : This is America.

Line1 : This is India.

move the cursor to a specific position in a file.

Program to move the cursor to a specific position in a file

In this python file program, we will move the cursor to a specific position in a file with the help of the below-given steps. Let’s consider we have readcontent.txt file with the below content.

				
					#readcontent.txt
Line1 : This is India.
Line2 : This is America.
Line3 : This is Canada.
Line4 : This is Australia.

Steps to solve the program

Open the first file by using open(“readcontent.txt”).
Read the lines using readlines().
Print the position of the cursor using file.tell()
Move the cursor to the 10th position using file.seek(10).
Again print the position of the cursor using file.tell().

				
					# Open the file
file = open('readcontent.txt')
# Read lines in the file
file.readline()
# Print position of the curosr
print("Position of a cursor in the file: ",file.tell())
# Move cursor to a specific Position
file.seek(10)
# Again print position of the cursor
print("Position of a cursor in the file: ",file.tell())

Output :

Position of a cursor in the file: 23 
Position of a cursor in the file: 10

find the cursor position in a file.

read the content of the file in reverse order.