Introduction to Python Programming Lab (BPLCK105B/205B) Manual for VTU

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 13:01:34 2022

01AStudDetails.py
Develop a program to read the student details like Name, USN, and Marks in three subjects. 
Display the student details, total marks and percentage with suitable messages.

@author: Prabodh C P
"""

stName = input("Enter the name of the student : ")
stUSN = input("Enter the USN of the student : ")
stMarks1 = int(input("Enter marks in Subject 1 : "))
stMarks2 = int(input("Enter marks in Subject 2 : "))
stMarks3 = int(input("Enter marks in Subject 3 : "))


print("Student Details\n=========================")
print("%12s"%("Name :"), stName)
print("%12s"%("USN :"), stUSN)
print("%12s"%("Marks 1 :"), stMarks1)
print("%12s"%("Marks 2 :"), stMarks2)
print("%12s"%("Marks 3 :"), stMarks3)
print("%12s"%("Total :"), stMarks1+stMarks2+stMarks3)
print("%12s"%("Percent :"), "%.2f"%((stMarks1+stMarks2+stMarks3)/3))
print("=========================")

putta:~/.../Programs$ python3 01AStudDetails.py 

Enter the name of the student : RAMESH
Enter the USN of the student : 1SI22CS036
Enter marks in Subject 1 : 87
Enter marks in Subject 2 : 78
Enter marks in Subject 3 : 65
Student Details
=========================
      Name : RAMESH
       USN : 1SI22CS036
   Marks 1 : 87
   Marks 2 : 78
   Marks 3 : 65
     Total : 230
   Percent : 76.67
=========================

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 13:23:54 2022

01BChkSnrCitzn.py

Develop a program to read the name and year of birth of a person. Display whether the person is a senior citizen or not.

@author: Prabodh C P
"""
from datetime import date


perName = input("Enter the name of the person : ")
perDOB = int(input("Enter his year of birth : "))

curYear = date.today().year
perAge = curYear - perDOB 

if (perAge > 60):
    print(perName, "aged", perAge, "years is a Senior Citizen.")
else:
    print(perName, "aged", perAge, "years is not a Senior Citizen.")

putta:~/.../Programs$ python3 01BChkSnrCitzn.py 

Enter the name of the person : Akbar Khan
Enter his year of birth : 1978
Akbar Khan aged 44 years is not a Senior Citizen.

putta:~/.../Programs$ python3 01BChkSnrCitzn.py 

Enter the name of the person : George Best
Enter his year of birth : 1957
George Best aged 65 years is a Senior Citizen.

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 13:36:30 2022

02AFibonacci.py

Develop a program to generate Fibonacci sequence of length (N). Read N from the console.

@author: Prabodh C P
"""

num = int(input("Enter the Fibonacci sequence length to be generated : "))

firstTerm = 0
secondTerm = 1
print("The Fibonacci series with", num, "terms is :")
print(firstTerm, secondTerm, end=" ")
for i in range(2,num):
    curTerm = firstTerm + secondTerm
    print(curTerm, end=" ")
    firstTerm = secondTerm
    secondTerm = curTerm
    

putta:~/.../Programs$ python3 02AFibonacci.py 

Enter the Fibonacci sequence length to be generated : 8
The Fibonacci series with 8 terms is :
0 1 1 2 3 5 8 13 


putta:~/.../Programs$ python3 02AFibonacci.py 

Enter the Fibonacci sequence length to be generated : 5
The Fibonacci series with 5 terms is :
0 1 1 2 3 

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 13:36:52 2022

02BFactNCR.py

Write a function to calculate factorial of a number. 
Develop a program to compute binomial coefficient (Given N and R).

@author: Prabodh C P
"""

def fact(num):
    if num == 0:
        return 1
    else:
        return num * fact(num-1)
    
    
n = int(input("Enter the value of N : "))
r = int(input("Enter the value of R (R cannot be negative or greater than N): "))
nCr = fact(n)/(fact(r)*fact(n-r))

print(n,'C',r," = ","%d"%nCr,sep="")

putta:~/.../Programs$ python3 02BFactNCR.py 
Enter the value of N : 7
Enter the value of R (R cannot be negative or greater than N): 5
7C5 = 21

Enter the value of N : 5
Enter the value of R (R cannot be negative or greater than N): 5
5C5 = 1

Enter the value of N : 3
Enter the value of R (R cannot be negative or greater than N): 1
3C1 = 3

Enter the value of N : 8
Enter the value of R (R cannot be negative or greater than N): 0
8C0 = 1

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 13:59:36 2022

03MeanVarSD.py

Read N numbers from the console and create a list. Develop a program to print mean, variance and
standard deviation with suitable messages.

@author: Prabodh C P
"""

from math import sqrt

myList = []

num = int(input("Enter the number of elements in your list : "))

for i in range(num):
    val = int(input("Enter the element : "))
    myList.append(val)
    
print('The length of list1 is', len(myList))

print('List Contents', myList)


total = 0
for elem in myList:
    total += elem

mean = total / num

total = 0
for elem in myList:
    total += (elem - mean) * (elem - mean)

variance = total / num

stdDev = sqrt(variance)

print("Mean =", mean)
print("Variance =", variance)
print("Standard Deviation =", "%.2f"%stdDev)

putta:~/.../Programs$ python3 03_Mean_Var_SD.py 

Enter the number of elements in your list : 5
Enter the element : 45
Enter the element : 34
Enter the element : 86
Enter the element : 92
Enter the element : 35

The length of list1 is 5
List Contents [45, 34, 86, 92, 35]

Mean = 58.4
Variance = 642.64
Standard Deviation = 25.35

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 14:12:31 2022

04DigitFreq.py

Read a multi-digit number (as chars) from the console. 
Develop a program to print the frequency of each digit with suitable message.

@author: Prabodh C P
"""

num = input("Enter a number : ")
print("The number entered is :", num)

uniqDig = set(num)
#print(uniqDig)

for elem in uniqDig:
    print(elem, "occurs", num.count(elem), "times")

putta:~/.../Programs$ python3 04DigitFreq.py 

Enter a number : 234939
The number entered is : 234939
4 occurs 1 times
9 occurs 2 times
3 occurs 2 times
2 occurs 1 times

putta:~/.../Programs$ python3 04DigitFreq.py 

Enter a number : 7843338
The number entered is : 7843338
7 occurs 1 times
4 occurs 1 times
3 occurs 3 times
8 occurs 2 times

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 14:21:12 2022

05WordFreq.py

Develop a program to print 10 most frequently appearing words in a text file. [Hint: Use dictionary
with distinct words and their frequency of occurrences. Sort the dictionary in the reverse order of
frequency and display dictionary slice of first 10 items]

@author: Prabodh C P
"""
import sys
import string
import os.path


fname = input("Enter the filename : ")      #sample file text.txt also provided


if not os.path.isfile(fname):
    print("File", fname, "doesn't exists")
    sys.exit(0)

infile = open(fname, "r")

filecontents = ""

for line in infile:
    for ch in line:
        if ch not in string.punctuation:
            filecontents = filecontents + ch
        else:
            filecontents = filecontents + ' '   #replace punctuations and newline with a space
            
wordFreq = {}

wordList = filecontents.split()

#Calculate word Frequency

for word in wordList:
    if word not in wordFreq.keys():
        wordFreq[word] = 1
    else:
        wordFreq[word] += 1
        
# print(wordFreq)
        
# for word, frequency in wordFreq.items():
#     print(word, "occurs", frequency, "times")

#Sort Dictionary based on values in descending order
sortedWordFreq = sorted(wordFreq.items(), key=lambda x:x[1], reverse=True )

# print(type(sortedWordFreq))

# print(sortedWordFreq)

#Display 10 most frequently appearing words with their count

print("\n===================================================")
print("10 most frequently appearing words with their count")
print("===================================================")
for i in range(10):
    print(sortedWordFreq[i][0], "occurs", sortedWordFreq[i][1], "times")

putta:~/.../Programs$ python3 05WordFreq.py 

Enter the filename : text.txt

===================================================
10 most frequently appearing words with their count
===================================================
the occurs 45 times
of occurs 24 times
party occurs 12 times
part occurs 12 times
a occurs 9 times
and occurs 8 times
second occurs 7 times
to occurs 6 times
shall occurs 6 times
first occurs 5 times

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 17:14:27 2022

06SortLinesFile.py

Develop a program to sort the contents of a text file and write the sorted contents into a separate text
file. [Hint: Use string methods strip(), len(), list methods sort(), append(), and file methods open(),
readlines(), and write()].

@author: Prabodh C P
"""

import os.path
import sys

fname = input("Enter the filename whose contents are to be sorted : ")      #sample file unsorted.txt also provided

if not os.path.isfile(fname):
    print("File", fname, "doesn't exists")
    sys.exit(0)

infile = open(fname, "r")

myList = infile.readlines()
# print(myList)

#Remove trailing \n characters
lineList = []
for line in myList:
    lineList.append(line.strip())

lineList.sort()

#Write sorted contents to new file sorted.txt

outfile = open("sorted.txt","w")


for line in lineList:
    outfile.write(line + "\n")

infile.close()  # Close the input file
outfile.close() # Close the output file

    
if os.path.isfile("sorted.txt"):
    print("\nFile containing sorted content sorted.txt created successfully")
    print("sorted.txt contains", len(lineList), "lines")
    print("Contents of sorted.txt")
    print("=================================================================")
    rdFile = open("sorted.txt","r")
    for line in rdFile:
        print(line, end="")

putta:~/.../Programs$ python3 06SortLinesFile.py 

Enter the filename whose contents are to be sorted : unsorted.txt

File containing sorted content sorted.txt created successfully
sorted.txt contains 15 lines
Contents of sorted.txt
=================================================================
A deep C diva.
All the troubles you have will pass away very quickly.
Beware of a tall black man with one blond shoe.
Don't read everything you believe.
Exercise caution in your daily affairs.
He changes the domain.
How does a hacker fix a function which doesn't work for all of the elements in its domain?
Lay on, MacDuff, and curs'd be him who first cries, "Hold, enough!".
People are beginning to notice you.  Try dressing before you leave the house.
The surest protection against temptation is cowardice.
To be or not to be.
Tuesday is the Wednesday of the rest of your life.
What is the square root of 4b^2?
You display the wonderful traits of charm and courtesy.
You may be recognized soon.  Hide.

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 16:14:28 2022

07BackFolderZip.py

Develop a program to backing Up a given Folder (Folder in a current working directory) into a ZIP
File by using relevant modules and suitable methods.

@author: Prabodh C P
"""

import os
import sys
import pathlib
import zipfile

dirName = input("Enter Directory name that you want to backup : ")

if not os.path.isdir(dirName):
    print("Directory", dirName, "doesn't exists")
    sys.exit(0)
    
curDirectory = pathlib.Path(dirName)
    
with zipfile.ZipFile("myZip.zip", mode="w") as archive:
    for file_path in curDirectory.rglob("*"):
        archive.write(file_path, arcname=file_path.relative_to(curDirectory))
    
if os.path.isfile("myZip.zip"):
    print("Archive", "myZip.zip", "created successfully")
else:
    print("Error in creating zip archive")

putta:~/.../Programs$ python3 07BackFolderZip.py 

Enter Directory name that you want to backup : zipDemo
Archive myZip.zip created successfully

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 17:50:46 2022

08AssertExceptDemo.py

Write a function named DivExp which takes TWO parameters a, b and returns a value c (c=a/b). Write
suitable assertion for a>0 in function DivExp and raise an exception for when b=0. Develop a suitable
program which reads two values from the console and calls a function DivExp.

@author: Prabodh C P
"""
import sys

def DivExp(a,b):
    assert a>0, "a should be greater than 0"
    try:
        c = a/b
    except ZeroDivisionError:
        print("Value of b cannot be zero")
        sys.exit(0)
    else:
        return c

val1 = int(input("Enter a value for a : "))
val2 = int(input("Enter a value for b : "))

val3 = DivExp(val1, val2)

print(val1, "/", val2, "=", val3)

putta:~/.../Programs$ python3 08AssertExceptDemo.py 
Enter a value for a : 7
Enter a value for b : 6
7 / 6 = 1.1666666666666667

putta:~/.../Programs$ python3 08AssertExceptDemo.py 
Enter a value for a : 0
Enter a value for b : 5
AssertionError: a should be greater than 0

putta:~/.../Programs$ python3 08AssertExceptDemo.py 
Enter a value for a : -3
Enter a value for b : 6
AssertionError: a should be greater than 0

putta:~/.../Programs$ python3 08AssertExceptDemo.py 
Enter a value for a : 6
Enter a value for b : 0
Value of b cannot be zero

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 18:11:47 2022

09ComplexClass.py

Define a function which takes TWO objects representing complex numbers and returns new complex
number with a addition of two complex numbers. Define a suitable class ‘Complex’ to represent the
complex number. Develop a program to read N (N >=2) complex numbers and to compute the addition
of N complex numbers.

@author: Prabodh C P
"""

class Complex:
    def __init__(self, realp = 0, imagp=0):
        self.realp = realp
        self.imagp = imagp
        
    def setComplex(self, realp, imagp):
        self.realp = realp
        self.imagp = imagp

    def readComplex(self):
        self.realp = int(input("Enter the real part : "))
        self.imagp = int(input("Enter the real part : "))
        
    def showComplex(self):
        print('(',self.realp,')','+i','(',self.imagp,')',sep="")

    def addComplex(self, c2):
        c3 = Complex()
        c3.realp = self.realp + c2.realp
        c3.imagp = self.imagp + c2.imagp
        return c3
        
def add2Complex(a,b):
    c = a.addComplex(b)
    return c

def main():
    c1 = Complex(3,5)
    c2 = Complex(6,4)
    
    print("Complex Number 1")
    c1.showComplex()
    print("Complex Number 2")
    c2.showComplex()
    
    c3 = add2Complex(c1, c2)

    print("Sum of two Complex Numbers")    
    c3.showComplex()

#Addition of N (N >=2) complex numbers

    compList = []
    
    num = int(input("\nEnter the value for N : "))
    
    for i in range(num):
        print("Object", i+1)
        obj = Complex()
        obj.readComplex()
        compList.append(obj)
    
    print("\nEntered Complex numbers are : ")
    for obj in compList:
        obj.showComplex()
        
    sumObj = Complex()
    for obj in compList:
        sumObj = add2Complex(sumObj, obj)    
    
    
    print("\nSum of N complex numbers is", end = " ")
    sumObj.showComplex()
    
main()

putta:~/.../Programs$ python3 09ComplexClass.py 

Complex Number 1
(3)+i(5)
Complex Number 2
(6)+i(4)
Sum of two Complex Numbers
(9)+i(9)

Enter the value for N : 5
Object 1
Enter the real part : 1
Enter the real part : 9
Object 2
Enter the real part : 2
Enter the real part : 8
Object 3
Enter the real part : 3
Enter the real part : 7
Object 4
Enter the real part : 4
Enter the real part : 6
Object 5
Enter the real part : 5
Enter the real part : 5

Entered Complex numbers are : 
(1)+i(9)
(2)+i(8)
(3)+i(7)
(4)+i(6)
(5)+i(5)

Sum of N complex numbers is (15)+i(35)

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Fri Dec 23 18:58:35 2022

10StudentClass.py

Develop a program that uses class Student which prompts the user to enter marks in three subjects and
calculates total marks, percentage and displays the score card details. [Hint: Use list to store the marks
in three subjects and total marks. Use __init__() method to initialize name, USN and the lists to store
marks and total, Use getMarks() method to read marks into the list, and display() method to display the
score card details.]

@author: Prabodh C P
"""

class Student:
    def __init__(self, name = "", usn = "", score = [0,0,0,0]):
        self.name = name
        self.usn = usn
        self.score = score
        
    def getMarks(self):
        self.name = input("Enter student Name : ")
        self.usn = input("Enter student USN : ")
        self.score[0] = int(input("Enter marks in Subject 1 : "))
        self.score[1] = int(input("Enter marks in Subject 2 : "))
        self.score[2] = int(input("Enter marks in Subject 3 : "))
        self.score[3] = self.score[0] + self.score[1] + self.score[2]
        
    def display(self):
        percentage = self.score[3]/3
        spcstr = "=" * 81
        print(spcstr)
        print("SCORE CARD DETAILS".center(81))
        print(spcstr)
        print("%15s"%("NAME"), "%12s"%("USN"), "%8s"%"MARKS1","%8s"%"MARKS2","%8s"%"MARKS3","%8s"%"TOTAL","%12s"%("PERCENTAGE"))
        print(spcstr)
        print("%15s"%self.name, "%12s"%self.usn, "%8d"%self.score[0],"%8d"%self.score[1],"%8d"%self.score[2],"%8d"%self.score[3],"%12.2f"%percentage)
        print(spcstr)


def main():
    s1 = Student()
    s1.getMarks()
    s1.display()

main()

putta:~/.../Programs$ python3 10StudentClass.py 

Enter student Name : Shivappa
Enter student USN : 1SI22CS065
Enter marks in Subject 1 : 87
Enter marks in Subject 2 : 79
Enter marks in Subject 3 : 92
=================================================================================
                                SCORE CARD DETAILS                               
=================================================================================
           NAME          USN   MARKS1   MARKS2   MARKS3    TOTAL   PERCENTAGE
=================================================================================
       Shivappa   1SI22CS065       87       79       92      258        86.00
=================================================================================