CS - XII - TEXT FILES - PRACTICE QUESTIONS - 21 JULY

 

TEXT FILES

PRACTICE QUESTIONS

1. Write a Python function that Count total number of vowels in a file “abc.txt”.

 def count_vowels():

    count = 0

    with open("abc.txt", "r") as F:

        S = F.read()

        for x in S:

            if x.lower() in "aeiou":

                count += 1

    print("Total number of vowels are:", count)

count_vowels()

2. function that extracts and displays all the words from a text file named "text.txt" which begin with a vowel (A, E, I, O, U – both uppercase and lowercase):

def vowel_words():

    vowels = 'AEIOUaeiou'

    file = open("text.txt", "r")  # Open the file in read mode

    content = file.read()

    file.close()  # Close the file

    words = content.split()  # Split the content into words

    print("Words starting with a vowel:")

    for word in words:

        if word[0] in vowels:

            print(word)

vowel_words()

3.Write a Python function longest_word() that reads text from a file "words.txt" and returns the longest word in the file.

file = open("text.txt", "r")     

content = file.read()   

print(content)           

file.close()                       

words = content.split()           # Step 4: Split text into a list of words

max_word = " "                      # Step 5: Start with an empty longest word

for word in words:                 

    if len(word) > len(max_word): 

        max_word = word

print(max_word)

4.Python function named govWeb() that reads a file called URLs.txt and displays all the words that contain "gov.in"

def govWeb():

    file = open("text.txt", "r")       

    content = file.read()             

    file.close()          

            

    words = content.split()           

    print("Words containing 'gov.in':")

    for word in words:

        if "gov.in" in word:

            print(word)

govWeb()

5.Write a UDF count_the() to read a text file text.txt and count no.of times the word the/The is appearing in the file

def count_the():

    f = open("C:/Users/Kirti Hora/Desktop/TFILE/text3.txt","r")

    ctr= 0

    str= f.read()

    wdlist= str.split()

    for wd in wdlist:

        if wd== "the" or wd=="The":

                     ctr+=1

    print("No of THE present in the file are -",ctr)

    f.close()

count_the()

6.Python function that reads a text file named Alpha.txt and displays only the lines that begin with the word "You"

def display_you():

    file = open("Alpha.txt", "r")  # Open the file

    for line in file:

        if line[:3] == "You":      # Check if first 3 characters are "You"

            print(line, end="")    # Print the matching line

    file.close()                   # Close the file

OR

def display_you():

    file = open("Alpha.txt", "r")  # Open file in read mode

    for line in file:

        if line.startswith("You"):

            print(line, end="")    # Print the line (end="" avoids double newlines)

    file.close()                  # Close the file

7.Python function that reads from "Words.txt" and displays all words longer than 5 characters

def long_words():

    file = open("C:/Users/Kirti Hora/Desktop/TFILE/text3.txt", "r")  # Open the file in read mode

    for line in file:

        words = line.split()  # Split line into individual words

        for word in words:

            if len(word) > 5:

                print(word)

    file.close()  # Close the file

long_words()

8. Write a method/function DISPLAYWORDS() in python to read lines from a text file STORY.TXT, and display those words, which are less than 4 characters.

9.Write a function in python to count the number of lines in a text file 'STORY.TXT' which is starting with an alphabet 'A'.

def count_A():

    count = 0

    file = open("text.TXT", "r")  # Open the file in read mode

    for line in file:

        if len(line) > 0 and line[0] == 'A':  # Check if line starts with 'A'

            count += 1

    file.close()  # Close the file

    print("Number of lines starting with 'A':", count)

count_A()

Q: Difference Between r+ and w+ modes

r+ Mode in Python File Handling: 

The r+ mode is used to open a file for both reading and writing.

·       The file must already exist. If it does not, Python will raise a FileNotFoundError.

·       The file pointer is placed at the beginning of the file.

·       You can read from and write to the file.

·       When you write, it overwrites the content from the current file pointer onward (it doesn't insert).

Meaning of "w+" Mode:

• Opens the file for both writing and reading.

• Creates the file if it does not exist.

• Overwrites the file (deletes all existing content) if it already exists.

• The file pointer is placed at the beginning of the file.