Important Python File Handling Programs Class 12 – suitable for practical file

In this post, I am sharing Python File Handling Programs class 12 for your practical file and practical records. This post focuses on text file practical programs.

Python File Handling Programs Class 12

[1] Create a text file “intro.txt” in python and ask the user to write a single line of text by user input.

def program1():
    f = open("intro.txt","w")
    text=input("Enter the text:")
    f.write(text)
    f.close()
program1()

[2] Create a text file “MyFile.txt” in python and ask the user to write separate 3 lines with three input statements from the user.

def program2():
    f = open("MyFile.txt","w")
    line1=input("Enter the text:")
    line2=input("Enter the text:")
    line3=input("Enter the text:")
    new_line="\n"
    f.write(line1)
    f.write(new_line)
    f.write(line2)
    f.write(new_line)
    f.write(line3)
    f.write(new_line)
    f.close()
program2()

[3] Write a program to read the contents of both the files created in the above programs and merge the contents into “merge.txt”. Avoid using the close() function to close the files.

def program3():
    with open("MyFile.txt","r") as f1:
       data=f1.read()
    with open("intro.txt","r") as f2:
        data1=f2.read()
    with open("merge.txt","w") as f3:
        f3.write(data)
        f3.write(data1)
program3()

In the next section of Python File Handling Programs Class 12 you will find programs based on counting letters.

[4] Count the total number of upper case, lower case, and digits used in the text file “merge.txt”.

def program4():
    with open("merge.txt","r") as f1:
       data=f1.read()
    cnt_ucase =0
    cnt_lcase=0
    cnt_digits=0
    for ch in data:
        if ch.islower():
            cnt_lcase+=1
        if ch.isupper():
            cnt_ucase+=1
        if ch.isdigit():
            cnt_digits+=1
    print("Total Number of Upper Case letters are:",cnt_ucase)
    print("Total Number of Lower Case letters are:",cnt_lcase)
    print("Total Number of  digits are:",cnt_digits)
program4()

[5] Write a program to count a total number of lines and count the total number of lines starting with ‘A’, ‘B’, and ‘C’. (Consider the merge.txt file)

def program5():
    with open("merge.txt","r") as f1:
       data=f1.readlines()
    cnt_lines=0
    cnt_A=0
    cnt_B=0
    cnt_C=0
    for lines in data:
        cnt_lines+=1
        if lines[0]=='A':
            cnt_A+=1
        if lines[0]=='B':
            cnt_B+=1
        if lines[0]=='C':
            cnt_C+=1
    print("Total Number of lines are:",cnt_lines)
    print("Total Number of lines strating with A are:",cnt_A)
    print("Total Number of lines strating with B are:",cnt_B)
    print("Total Number of lines strating with C are:",cnt_C)
program5()

[6] Find the total occurrences of a specific word from a text file:

def program6():
    cnt = 0
    word_search = input("Enter the words to search:")
    with open("merge.txt","r") as f1:
        for data in f1:
            words = data.split()
            for word in words:
                if (word == word_search):
                    cnt+=1
    print(word_search, "found ", cnt, " times from the file")
program6()

Python File Handling Programs based on read(), readline() and readlines() functions.

[7] Read first n no. letters from a text file, read the first line, read a specific line from a text file.

def program7():
    cnt = 0
    n = int(input("Enter no. characters to read:"))
    with open("merge.txt","r") as f1:
       line1=f1.readline()
       print("The first line of file:",line1)
       nchar=f1.read(n)
       print("First n no. of characters:", nchar)
       nline=f1.readlines()
       print("Line n:",nline[n])
program7()

Now let us see Programs based on replace contents. in Python File Handling Programs Class 12

[8] Replace all spaces from text with – (dash).

def program8():
    cnt = 0
    n = int(input("Enter no. characters to read:"))
    with open("merge.txt","r") as f1:
       data = f1.read()
       data=data.replace(' ','-')
    with open("merge.txt","w") as f1:
        f1.write(data)
program8()

Below are some Programs based on tell() and seek() functions in Python File Handling Programs Class 12.

[9] Write a program to know the cursor position and print the text according to below-given specifications:

1. Print the initial position
2. Move the cursor to 4th position
3. Display next 5 characters
4. Move the cursor to the next 10 characters
5. Print the current cursor position
6. Print next 10 characters from the current cursor position

def program9():
    f = open("merge.txt","r")
    print(f.tell())
    f.seek(4,0)
    print(f.read(5))
    f.seek(10,0)
    print(f.tell())
    print(f.seek(7,0))
    print(f.read(10))
program9()

In the next section of Python File Handling Programs Class 12 you will find programs based on high-order thinking skills.

[10] Append the contents in entered by the user in the text file:

def program10():
    text = input("Enter text to append in the file:")
    with open("merge.txt","a") as f1:
        f1.write(text)
program10()

[11] Read the contents of file in reverse order:

def program11():
    for i in reversed(list(open("merge.txt","r"))):
        print(i.rstrip())
program11()

[12] Replace multiple spaces with single space in a text file.

def program12():
    f1 = open("merge.txt","rt")
    f2 = open("merge1.txt","wt")
    for line in f1:
        f2.write(' '.join(line.split()))
    f1.close()
    f2.close()
program12()

Method 2:

import re
def program12():
    f1 = open("merge.txt","rt")
    f2 = open("merge3.txt","wt")
    for line in f1:
        f2.write(re.sub('\s+',' ',line))
    f1.close()
    f2.close()
program12()

In the next section of Python File Handling Programs Class 12 you will find a suggested practical list of programs given in the CBSE curriculum document.

Suggested Practical List of Programs given in CBSE Curriculum

[1] Read a text file line by line and display each word separated by a #.

f=open("MyFile.txt")
d=f.read()
s=''
for i in d:
  s+=i.replace(' ','#')
print(s)
f.close()

[2] Read a text file and display the number of vowels/consonants/uppercase/lowercase characters in the file.

f=open("MyFile.txt")
d=f.read()
v=0
c=0
u=0
l=0
for i in d:
  if i.isupper():
    u+=1
  elif i.islower():
    l+=1
  if i.lower() in 'aeiou':
    v+=1
  elif i.isspace():
    pass
  elif i.lower() not in 'aeiou':
    c+=1
print("Vowels:",v)
print("Consonants:",c)
print("Uppers:",u)
print("Lowers:",l)
f.close()

[3] Remove all the lines that contain the character ‘a’ in a file and write it to another file.

f1=open("MyFile.txt")
f2=open("Temp.txt",'w')
l=f1.readlines()
for i in l:
  if 'a' not in i:
    f2.write(i)
f1.close()
f2.close()

Thank you very much for reading Python File Handling Programs Class 12.

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