Using
write() function program
Q1. Write a function result() to open
a file “Student.txt” in write mode. Store names of the five students along with
the marks in English, Maths and Computer Science in this file.
def result():
fw=open('Student.txt', 'w')
print("To store names of give students along with the marks in the
file.")
for a in range(5):
nm=input("Enter name : ")
eng=int(input("Enter marks in
English : "))
maths=int(input("Enter the
marks in Maths : "))
comp=int(input("Enter the
marks in Computer Science : "))
rec=nm+''+str(eng)+' '+str(maths)+'
'+str(comp)+"\n"
fw.write(rec)
fw.close()
#main Program
result()
Output:
======================== RESTART:
G:/Student.py ========================
To store names of give students along
with the marks in the file.
Enter name : Varun
Enter marks in English : 65
Enter the marks in Maths : 78
Enter the marks in Computer Science :
56
Enter name : Soumya
Enter marks in English : 87
Enter the marks in Maths : 98
Enter the marks in Computer Science :
76
Enter name : Priyanshi
Enter marks in English : 78
Enter the marks in Maths : 89
Enter the marks in Computer Science :
67
Enter name : Avin
Enter marks in English : 76
Enter the marks in Maths : 87
Enter the marks in Computer Science :
56
Enter name : Sankalp
Enter marks in English : 98
Enter the marks in Maths : 89
Enter the marks in Computer Science :
87
Q2. Write a function Multiple() in
Python to create a text file ‘Note.txt’ to write few lines into it. If you
don’t want more lines then enter 0(zero) to quit the function
def Multiple():
fw=open('Note.txt', 'w')
print("Write a paragraph:")
a=1
while a==1:
line= input("Write line by
line :")
fw.write(line+"\n")
print("Do you want add more
line....")
a=int(input("Press 1 to
Continue and 0 to Quit "))
fw.close()
#main Program
Multiple()
Q3. Write a method in Python to write
multiple lines of text contents into a text file daynote.txt line.
def write():
f=open("daynote.txt", 'w')
while True:
line=input("Enter line :
")
f.write(line)
choice=input("Are there more
lines (Y/N) ")
if choice.upper()=='N':
break
f.close()
#main program
write()
Q4. Write a
program that reads characters from the keyboard one by one. All lower case
characters get stored inside the file LOWER, all upper case characters get
stored inside the file UPPER and all other characters get stored inside file
OTHERS.
upper =
open("UPPER.txt","w")
lower =
open("LOWER.txt" , "w" )
other = open
("OTHER.txt" , "w")
while True :
user = input("Enter a charracter (for
exit enter quit ): ")
if user == "quit" or user ==
"Quit" :
break
elif user.isupper() :
upper.write( user + " " )
elif user.islower( ) :
lower.write( user + " " )
else :
other.write( user + " " )
upper.close()
lower.close()
other.close()
Q5. Write a function
to insert a sentence in a text file, assuming that text file is very big and can’t fit in computer’s memory.
def add(sen) : f.write("\n"+ sen) f = open("Notes.txt",'a')sen = input("Enter a sentance :-")add(sen) f.close()Q6.
Write a program to add two more employees' details to the file
"emp.txt" already stored in disk.
f
= open("emp.txt ",'a')
emno
= input("Enter number of Employee :-")
nam
= input("Enter a name of Employee :-")
f.write(emno+"
, "+nam)
f.close()
Q7. Write a function Contact() in
Python to create a text file “Phone.txt” to write the names of five people along with their contact numbers.
def Contact():
fw=open("Phone.txt", 'w')
print("To store names of give peiple
along with their contact numbers in the file :")
for a in range(5):
nm=input("Enter name :")
telnm=input("Enter contact number
: ")
rec=nm+''+telnm+"\n"
fw.write(rec)
fw.close()
#main program
Contact()
Using
readline() function program
Q1. Write a function display to open
the same file ‘Student.txt’ in reamodede which will retrieve and display all
the records available in the file “Student.txt”
def display():
fr=open('Student.txt', 'r')
print("To read all the
records from the file. ")
print("Names and Marks in English, Maths and Computer
Science")
while True:
rec=fr.readline()
print(rec,end='')
fw.close()
#main Program
display()
Output:
========================== RESTART:
G:/Student1.py ==========================
To
read all the records from the file.
Names and Marks in English, Maths and
Computer Science
Varun 65 78 56
Soumya87 98 76
Priyanshi 78 89 67
Avin 76 87 56
Sankalp 98 89 87
Q2. Write a method in Python to read
lines from file DIARY.txt and display those lines which start with alphabet “P”
def display():
file = open("Diary.txt", "r")
line=file.readline()
count=0
while line:
if line[0]=='P':
print(line)
line=file.readline()
file.close()
#main program
display()
Q3. Write a method in Python to read
lines from a text file MYNOTES.txt and display those lines which starts with
the alphabet ‘K’.
def display():
file = open("MYNOTES.txt", "r")
line=file.readline()
count=0
while line:
if line[0]=='P':
print(line)
line=file.readline()
file.close()
#main program
display()
Q4. Write a program that copies a text
file “source.txt” onto “target.txt” barring the lines starting with “@” sign.
def filter(oldfile, newfile):
fin=open(oldfile, "r")
fout=open(newfile, "w")
while True:
text=fin.readline()
if len(text) ==0:
break
if text[0]=='@':
continue
fout.write(text)
fin.close()
fout.close()
filter("source.txt","target.txt")
Q5. Write a function Line() in Python
to use the previous text ile (Notebook.txt) in appropriate mode to retrieve all
the lines. Count the number of lines available in the file and display all the
with line number.
def Lines():
fr=open("Name.txt", "r")
print("Display Line and Line Number : ")
print("Line No. :","Line")
c=0
line=True
while line:
line=fr.readline()
if line==" ":
continue
c=c+1
print(c, " ", line,
end='')
fr.close()
#main program
Lines()
Using
readlines function programs
Q1. Write a user define function in
Python that displays the number of lines starting with ‘H’ in file Para.txt
Example if the contains:
Whose woods these are I think I know.
His house is in the village though;
He will not see me stopping here
To watch his woods fill up with snow.
Then the line count should be 2.
def countH():
f=open("Para.txt", "r")
lines=0
l=f.readlines()
print(l)
for i in l:
if i[0]=='H':
lines+=1
print("No. of lines are : ", lines)
#main program
countH()
Q2. Write a
program to search the names and addresses of persons having age more than 30 in
the data list of persons.
f = open("csnip.txt",'r')data = f.readlines()for i in data : age = i.split(",") if int(age[ 2 ]) >= 30 : print(age[ : 2 ])Q3. Write a function in
python to count and display the number of lines starting with alphabet
'A' present in a text file "LINE.Text". eg. The file
“LINE.TXT” contains the following lines:
A boy is
playing there.
There is a playground.
An aeroplane is in the sky.
Alphabets & numbers are allowed in password.
The function should display the output as 3.
count = 0 file = open("LINES.txt","r")lst = file.readlines()for i in lst : if i[ 0 ] == "A" : print(i) count += 1print()print("So for number of sentences started with A : ",count)file.close()Q4. Write a program to read a file
‘story.txt’ and create another file, storing an index of story.txt, telling
which line of the each word appears in. if word appears more than once, then
index should show al the line numbers containing the word.
file1 =
open("story.txt","r")
file2 =
open("Notes.txt","w")
data = file1.readlines()
for line in data :
words = line.split()
for j in words :
file2.write( j )
file2.write(" = ")
file2.write( "index :- " + str ( line.index( j ) ) + "
line:- " + str(data.index( line) +1 ) )
file2.write( "\n" )
file1.close()
file2.close()
Q5. Write a program to accept a
filename from the user and display all the lines from the file which contains
python comment character ‘#’.
user = input("Enter file name
:-")
f = open(user + ".txt",'r')
data = f.readlines()
for i in data :
if "#" in i :
print(i)
f.close()
Q6. A file
contains a list of telephone numbers in the following form:
Arvind 7258031
Sachin 7259197
The names contain
only one word the names and telephone numbers are separated by white spaces
Write program to read a file and display its contents in two columns.
print("Name\t|\tPhone
no. ")
file =
open("Note.txt", "r")
lst =
file.readlines()
for i in lst :
data = i.split()
print( data[0] ,end = "\t" )
print("|" , end = "\t")
print ( data[1] )
file.close()
Q7. Write a program to count the words
"to" and "the" present in a text file "Poem.txt".
Poem.txt
Contains :-
This is the Python Website.We are going to do some Python code Like a joy on the heart of a sorrow,The sunset hangs on a cloud;A golden storm of glittering sheaves,Of fair and frail and fluttering leaves,The wild wind blows in a cloud. Hark to a voice that is callingTo my heart in the voice of the wind:My heart is weary and sad and alone,For its dreams like the fluttering leaves have gone,And why should I stay behind?to_no = 0
the_no = 0
file = open("Poem.txt",
"r")
lst = file.readlines()
for i in lst :
word
= i.split()
for
j in word :
if j == "to" or j == "To" :
to_no += 1
elif j == "the" or j == "The" :
the_no += 1
print("Number 'to' : " , to_no)
print("Number 'the' : " , the_no)
file.close()
Q8. A file “Phone.txt” is a text file
which contains few names of the consumers. Write a function Display() in Python
to open the file in an appropriate mode to retrieve the names. Count and
display the names of all the consumers with the phone numbers whose names start
with the letter ‘D’. Assume that the file already exists in the system.
def Display():
fr=open("Phone.txt", "r")
line=fr.readlines()
print("Names with the Contact Numbers:")
c=0
for a in line:
if a[0]=='D':
print(a, end='')
c=c+1
print("Total number of consumers :", c)
fr.close()
#main priogram
Display()
Q9.
Reading a file line by line from the beginning What if you want to read a file
backward? This happens when you need to read log files. Write a program to read
and display content of file from end to beginning.
f1
= open("Poem.txt",'r')
data
= f1.readlines()
content
= ""
for
i in data :
content += i+"\n"
for
i in range (-1 , -len(content),-1):
print(content[ i ],end = "")
f1.close()
Q10.
Write a Python program to display the size of a file after removing EOL characters,
leading and trailing white spaces and blank lines.
f1
= open("path.txt",'r')
data
= f1.readlines()
content
= ""
for
i in data :
for j in i :
if j.isalnum():
content += j
print("file
size:-",len(content),"bits")
f1.close()
Q11.
Write a function Remove_Lowercase() that accepts two file names, and copies all
lines that do not start with lowercase letter from the first file into the
second file.
def
Remove_Lowercase(f1,f2) :
data = f1.readlines()
for i in data :
if i[ 0 ].isupper() :
f2.write(i + "\n")
f1
= open("Poem.txt",'r')
f2
= open("Poem1.txt",'w')
Remove_Lowercase(f1,f2)
f2.close()
Q12.
Write a program to display all the records in a file along with line/record
number.
Let
us consider content of file be like --
Java,
BlueJ, cp
Computer,
portal, express
f
= open("Notes.txt",'r')
data
= f.readlines()
for
i in range (len(data)) :
line = data[ i ].split(",")
print("Line number =",i+1)
for j in range (len(line)):
print("Record number =
",j+1,end=" , ")
print(line[ j ])
f.close()
Q13.
Write a method in Python to write multiple line of text contents into a text
file mylife.txt.
f1
= open("Note.txt", 'r')
f2 = open("myfile.txt", "w")
data
= f1.readlines()
for
i in data :
f2.write(i)
f2.close()
Q14.
Write a method in Python to read the content from a text file DIARY.TXT line by
line and display the same on the screen.
f1 = open("DIARY.TXT ",'r')
data
= f1.readlines()
for
i in data :
print(i)
f1.close()
Q15.
Anant has been asked to display all the students who have scored less than 40
for Remedial Classes, Write a user-defined function to display all those
students who have scored less than 40 from the binary file
"Student.dat".
Let
us consider content of file be like --
Name,
Marks
def dispaly(aut):
f = open("Student.dat", "rb")
try :
while True:
data = pickle.load(f)
if data[1] < 40 :
print( data)
except EOFError:
f.close()
Q16. . Write a function Words() in
Python to read lines from a text file Story.txt. Count and display the number
of words available in the text file.
fr=open('Story.txt')
lines=fr.readlines()
count=0
print(lines)
for i in lines:
count=count+len(i.split())
fr.close()
print("Count words :",
count)
Q17. The file 'City.txt’ stores the
names of few selected cities with the Pincode. Write function Display() to read
data and display only those cities with the Pincode whose first letter is not a
vowel.
Sample Output:
New Delhi 700028
Varanasi 110005
Dum Dum 212011
fr=open('city.txt','r')
lines=fr.readlines()
##print(lines)
for i in lines:
if i[0] not in 'aeiouAEIOU':
print(i,end='')
fr.close()
Q18. Write a function Vowel() in
Python to read lines from a text file Biography.txt. Count and display the
number of vowels present in the file.
def vowel():
fr=open('Biography.txt','r')
lines=fr.readlines()
##print(lines)
count=0
for i in lines:
if i[0] in 'aeiouAEIOU':
print(i,end='')
count+=1
fr.close()
print('Count vowel city : ',count)
#main Program
vowel()
Q19. Write a function Lastline() in
Python to read lines from a text file Paragraph.txt and display the last five
lines of the file on the output screen. Write the main program to call the
function.
[Hint: fr =
open("Paragraph.txt","r")
Line= fr.readlines()
print(line[-1]) # displays the last
line of the file]
def LastNlines(fname, N):
file=open(fname)
line=file.readlines()
for i in (line[-N:]):
print(i, end='')
#main Program
LastNlines('Story.txt',3)
OR
def LastNlines(fname, N):
with open(fname) as file:
for line in (file.readlines() [-N:]):
print(line, end ='')
#main Program
LastNlines('Story.txt',3)
Q20. A text file Admission.txt' stores
all the names of the students with the admission number and the stream in which
they have taken admission in class XI. The school wants to keep all the records
in different streams viz. Science, Arts and Commerce. Write a function Separate
to create three files as Science.txt, Arts.txt' and 'Commerce txt. Copy all the
records of the students accordingly in three files with the same details.
[Hint: Open three files in write mode and read the
data from the file Admission.txt]
fr= open("Admission.bxt","r")
fw1= open("Science.txt","w")
fw2= open("Arts.txt", "w")
fw3=open("Commerce.txt","w")
..............................................
..........................................
Admission.txt file
Narain 34 Science
Manoj 45 Arts
Sachin 23 Commerce
Deepak 11 Arts
Satyam 22 Science
Arif 12 Commerce
Jai 55 Arts
fr=open('Admission.txt','r')
line=fr.readlines()
print(line)
fs=open('Science.txt','w')
fa=open('Arts.txt','w')
fc=open('Commerce.txt','w')
a=s=c=[]
for i in line:
if 'Arts' in i:
fa.writelines(i+'\n')
if 'Science' in i:
fs.writelines(i+'\n')
if 'Commerce' in i:
fc.writelines(i+'\n')
fs.close()
fc.close()
fa.close()
Q21. A file 'Poem.txt' stores a poem
containing few lines. Define a function poem() to read all the lines from the
file and display the poem on the output screen with the heading.
def poem():
fr=open('Poem.txt')
lines=fr.readlines()
for i in lines:
print(i, end='')
#main program
poem()
Q22. The sports department of a school
has purchased few indoor and outdoor games equipments for the students. Define
a function Games_Record() to create a file Games.txt and enter all the
equipments with their details viz. name, price and quantity.
def Games_Record() :
fr=open('Games.txt')
lines=fr.readlines()
for i in lines:
print(i, end='')
#main program
Games_Record()
Using
read() function programs
Q1. Write a function countmy() in Python toread
the text file “DATA.txt” and count the number of times “my” occurs in the file.
For example, if the file “DATA.txt” contains- “This is my website. I
have displayed my preferences in the CHOUCE section.”- the countmy() function
shoule display the output as : “my occurs 2 times”.
def countmy():
f = open("DATA.txt", "r")
count=0
x = f.read()
word = x.split()
for i in word:
if (i=="my"):
count+=1
print("My occures :", count, " times")
#main program
countmy()
Q2. Write a
program to count the number of uppercase alphabets present in a text file
"Article.txt".
count = 0 file = open("Article.txt","r")sen = file.read()for i in range ( len(sen) ) : if sen[ i ].isupper() : count += 1 print("Number of upper case alphabet : ", count)file.close()Q3. Write a
program that copies one file to another. Have the program read the file names
from user ?
file1 = input("Enter
the name of original file :- ")
file2 = input("Enter
the name of New file :- : ")
old = open( file1 ,
"r")
new = open( file2,
"w")
data = old.read()
new.write( data )
print(" Program run
successfully ")
old.close()
new.close()
Q4. The file ‘Name.txt' stores the
names of all the students of class XII with admission number. Write a function
Count() to read the records from the file. Count and display all the uppercase
and lowercase letters available in the file.
[Hint: use split()]
def count():
fr=open('Science.txt')
lines=fr.read()
countU=countL=0
for i in lines:
if i.isupper():
countU+=1
if i.islower():
countL+=1
fr.close()
print("Upper Count letters :", countU)
print("Lower Count letters :", countL)
# main program
count()
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