Python Program 1.2...DEEPAK BHINDE PGT COMPUTER SCIENCE PYTHON PROGRAMS 1.2 PAGE 2 No. Program 1. Task: Python program to convert time from 12 hour to 24 hour format 2. Task: Python

2019

PYTHON PROGRAMS 1.2

DEEPAK BHINDEDEEPAK BHINDEDEEPAK BHINDEDEEPAK BHINDE

PGT COMPUTER SCIENCEPGT COMPUTER SCIENCEPGT COMPUTER SCIENCEPGT COMPUTER SCIENCE

www.dbgyan.wordpress.com

DEEPAK BHINDE PGT COMPUTER SCIENCE PYTHON PROGRAMS 1.2 PAGE 2

No. Program

1.

Task: Python program to convert time from 12 hour to 24 hour format

2. Task: Python program to swap two elements in a list

3. Task: Program for Selection Sort.

4. Task: Python program for implementation of Bubble Sort

5. Task: Python program for implementation of Insertion Sort

6. Task: Python program to find the factorial of a number using recursion.

7. Task: Python Program to calculate the value of sin(x) and cos(x).

8. Task: Python Program to a recursive code to find the sum of all elements of a

list.

9. Task: Write a recursive code to compute the nth Fibonacci number.

10. Task: Write Python program to convert floating to binary

11. Task: Write Python program to convert float decimal to octal number

12. Task: Write Python program Password validation.

13. Task: Python program to generate one-time password (OTP).

14. Task: Python program to generate QR Code using pyqrcode module.

15. Task: Python program to get IP Address.

16. Task: Python program to write a File.

17. Task: Python program to read from the File.

18. Task: Python program to merge Two Files.

19. Task :Python program to copy one file to another file.

20. Task:Python program to delete file.

21. Task :Python program to implement a stack.

22. Task: Python program to implement a Queue.

23. Task: Compute EMIs for a loan using the numpy or scipy libraries.

24. Task: Create a graphical application that accepts user inputs , performs some

operation on them and the writes the output on the screen . for example ,

write small calculator. Use the tkinter library.

25. Task : Program to implement to plot function y=X^2 using pyplot or matplotlib

libraries.

TASK POINTS


Program: 01 Date:

Task: Python program to convert time from 12 hour to 24 hour format

Note: Midnight is 12:00:00 AM on a 12-hour clock and 00:00:00 on a 24-hour clock. Noon is

12:00:00 PM on 12-hour clock and 12:00:00 on 24-hour clock.

Code:

# Function to convert the date format

def convert24(str1):

# checking if last two elements of time is AM and first two elements are 12

if str1[-2:] == "AM" and str1[:2] == "12":

return "00" + str1[2:-2]

# remove the AM

elif str1[-2:] == "AM":

return str1[:-2]

# Checking if last two elements of time is PM and first two elements are 12

elif str1[-2:] == "PM" and str1[:2] == "12":

return str1[:-2]

else:

# add 12 to hours and remove PM

return str(int(str1[:2]) + 12) + str1[2:8]

# Driver Code: passing value & function call

print(convert24("08:05:45 PM"))

Output:

20:05:45


Program: 02 Date:

Task: Python program to swap two elements in a list

Given a list in Python and provided the positions of the elements, write a program to swap

the two elements in the list.

Input : List = [23, 65, 19, 90], pos1 = 1, pos2 = 3

Output : [19, 65, 23, 90]

Input : List = [1, 2, 3, 4, 5], pos1 = 2, pos2 = 5

Output : [1, 5, 3, 4, 2]

Approach #1: Simple swap.

# program to swap elements at given positions

# Swap function

def swapPositions(list, pos1, pos2):

list[pos1], list[pos2] = list[pos2], list[pos1]

return list

# Driver function

List = [23, 65, 19, 90]

pos1, pos2 = 1, 3

print(swapPositions(List, pos1-1, pos2-1))

output :

[19, 65, 23, 90]


Approach #2 : Using Inbuilt list.pop() function

Pop the element at pos1 and store it in a variable. Similarly, pop the element at pos2 and

store it in another variable. Now insert the two popped element at each other’s original

position.


# Swap function


# popping both the elements from list

first_ele = list.pop(pos1)

second_ele = list.pop(pos2-1)

# inserting in each others positions

list.insert(pos1, second_ele)

list.insert(pos2, first_ele)

return list

# Driver function

List = [23, 65, 19, 90]

pos1, pos2 = 1, 3


Output :

[19, 65, 23, 90]


Approach #3: Using tuple variable

Store the element at pos1 and pos2 as a pair in a tuple variable, say get. Unpack those

elements with pos2 and pos1 positions in that list. Now, both the positions in that list are

swapped.


# Swap function


# Storing the two elements

# as a pair in a tuple variable get

get = list[pos1], list[pos2]

# unpacking those elements

list[pos2], list[pos1] = get

return list

# Driver function

List = [23, 65, 19, 90]

pos1, pos2 = 1, 3


Output :

[19, 65, 23, 90]


Program: 03 Date:

Task: Program for Selection Sort

The selection sort algorithm sorts an array by repeatedly finding the minimum element

(considering ascending order) from unsorted part and putting it at the beginning. The

algorithm maintains two subarrays in a given array.

1) The subarray which is already sorted.

2) Remaining subarray which is unsorted.

In every iteration of selection sort, the minimum element (considering ascending order)

from the unsorted subarray is picked and moved to the sorted subarray.

Code :

# Python program for implementation of Selection Sort

import sys

A = [64, 25, 12, 22, 11]

# Traverse through all array elements

for i in range(len(A)):

# Find the minimum element in remaining unsorted array

min_idx = i

for j in range(i+1, len(A)):

if A[min_idx] > A[j]:

min_idx = j

# Swap the found minimum element with the first element

A[i], A[min_idx] = A[min_idx], A[i]

# Driver code to test above

print ("Sorted array")

for i in range(len(A)):

print("%d" %A[i]),

Output:

Sorted array

11

12

22

25

64


Program: 04 Date:

Task: Python program for implementation of Bubble Sort

Bubble Sort is the simplest sorting algorithm that works by repeatedly swapping the

adjacent elements if they are in wrong order.

Code :

# Python program for implementation of Bubble Sort

def bubbleSort(arr):

n = len(arr)

# Traverse through all array elements

for i in range(n):

# Last i elements are already in place

for j in range(0, n-i-1):

# traverse the array from 0 to n-i-1

# Swap if the element found is greater

# than the next element

if arr[j] > arr[j+1] :

arr[j], arr[j+1] = arr[j+1], arr[j]


arr = [64, 34, 25, 12, 22, 11, 90]

bubbleSort(arr)

print ("Sorted array is:")

for i in range(len(arr)):

print ("%d" %arr[i]),

Output:

Sorted array is:

11

12

22

25

34

64

90


Program: 05 Date:

Task: Python program for implementation of Insertion Sort

Code : # Python program for implementation of Insertion Sort

# Function to do insertion sort

def insertionSort(arr):

# Traverse through 1 to len(arr)

for i in range(1, len(arr)):

key = arr[i]

# Move elements of arr[0..i-1], that are

# greater than key, to one position ahead

# of their current position

j = i-1

while j >=0 and key < arr[j] :

arr[j+1] = arr[j]

j -= 1

arr[j+1] = key


arr = [12, 11, 13, 5, 6]

insertionSort(arr)

print ("Sorted array is:")

for i in range(len(arr)):

print ("%d" %arr[i])

Output:

Sorted array is:

5

6

11

12

13


Program: 06 Date:

Task: Python program to find the factorial of a number using recursion.

Code: # Python program to find the factorial of a number using recursion

def recur_factorial(n):

"""Function to return the factorial of a number using recursion"""

if n == 1:

return n

else:

return n*recur_factorial(n-1)

# Change this value for a different result

num = 8

# uncomment to take input from the user

#num = int(input("Enter a number: "))

# check is the number is negative

if num < 0:

print("Sorry, factorial does not exist for negative numbers")

elif num == 0:

print("The factorial of 0 is 1")

else:

print("The factorial of",num,"is",recur_factorial(num))

Output:

The factorial of 8 is 40320


Program: 07 Date:

Task: Python Program to calculate the value of sin(x) and cos(x).

For Sin x function

Code :

# Python3 code for implementing sin function

import math;

# Function for calculating sin value

def cal_sin(n):

accuracy = 0.0001;

# Converting degrees to radian

n = n * (3.142 / 180.0);

x1 = n;

# maps the sum along the series

sinx = n;

# holds the actual value of sin(n)

sinval = math.sin(n);

i = 1;

while(True):

denominator = 2 * i * (2 * i + 1);

x1 = -x1 * n * n / denominator;

sinx = sinx + x1;

i = i + 1;

if(accuracy <= abs(sinval - sinx)):

break;


print(sinx);

# Driver Code

n = 45;

cal_sin(n);

Output :

0.7047230747708333

For cos function

# Python 3 code for implementing cos function

from math import fabs, cos

# Function for calculation

def cal_cos(n):

accuracy = 0.0001

# Converting degrees to radian

n = n * (3.142 / 180.0)

x1 = 1

# maps the sum along the series

cosx = x1

# holds the actual value of sin(n)

cosval = cos(n)

i = 1

denominator = 2 * i * (2 * i - 1)

x1 = -x1 * n * n / denominator

cosx = cosx + x1

i = i + 1

while (accuracy <= fabs(cosval - cosx)):

denominator = 2 * i * (2 * i - 1)

x1 = -x1 * n * n / denominator

cosx = cosx + x1


i = i + 1

print('{0:.6}'.format(cosx))

# Driver Code

if __name__ == '__main__':

n = 30

cal_cos(n)

output :

0.86602


Program: 08 Date:

Task: Python Program to a recursive code to find the sum of all elements of a list.

Given an array of integers, find sum of array elements using recursion.

Examples:

Input : A[] = {1, 2, 3}

Output : 6

1 + 2 + 3 = 6

Input : A[] = {15, 12, 13, 10}

Output : 50

Code :

# Python program to find sum of array elements using recursion.

# Return sum of elements in A[0..N-1] using recursion.

def _findSum(arr, N):

if len(arr)== 1:

return arr[0]

else:

return arr[0]+_findSum(arr[1:], N)

# driver code

arr =[]

# input values to list

arr = [1, 2, 8, 4, 5,6]

# calculating length of array

N = len(arr)

ans =_findSum(arr,N)

print (ans)

Output :

26


Program: 09 Date:

Task: Write a recursive code to compute the nth

Fibonacci number.

The Fibonacci numbers are the numbers in the following integer sequence.

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ……..

In mathematical terms, the sequence Fn of Fibonacci numbers is defined by the recurrence

relation Fn = Fn-1 + Fn-2 with seed values F0 = 0 and F1 = 1.

Given a number n, print n-th Fibonacci Number.

Examples:

Input : n = 2

Output : 1

Input : n = 11

Output : 89

Code :

# Function for nth Fibonacci number

def Fibonacci(n):

if n<0:

print("Incorrect input")

# First Fibonacci number is 0

elif n==0:

return 0

# Second Fibonacci number is 1

elif n==1:

return 1

else:

return Fibonacci(n-1)+Fibonacci(n-2)

# Driver Program

print(Fibonacci(11))

Output:

89

fib(5)

/ \

fib(4) fib(3)

/ \ / \

fib(3) fib(2) fib(2) fib(1)

/ \ / \ / \

fib(2) fib(1) fib(1) fib(0) fib(1) fib(0)

/ \

fib(1) fib(0)


Approach :

To convert a floating point decimal number into binary, first convert the integer part

into binary form and then fractional part into binary form and finally combine both

results to get the final answer.

For Integer Part, keep dividing the number by 2 and noting down the remainder until

and unless the dividend is less than 2. If so, stop and copy all the remainders

together.

For Decimal Part, keep multiplying the decimal part with 2 until and unless 0 left as

fractional part. After multiplying the first time, note down integral part and again

multiply decimal part of the new value by 2. Keep doing this until reached a perfect

number.

Program: 10 Date:

Task: Write Python program to convert floating to binary

Code -

# Function returns octal representation

def float_bin(number, places = 3):

# split() seperates whole number and decimal part and stores it in two separate

#variables

whole, dec = str(number).split(".")

# Convert both whole number and decimal part from string type to integer type

whole = int(whole)

dec = int (dec)

# Convert the whole number part to it's respective binary form and remove the

# "0b" from it.

res = bin(whole).lstrip("0b") + "."


# Iterate the number of times, we want the number of decimal places to be

for x in range(places):

# Multiply the decimal value by 2 and seperate the whole number part

# and decimal part

whole, dec = str((decimal_converter(dec)) * 2).split(".")

# Convert the decimal part to integer again

dec = int(dec)

# Keep adding the integer parts receive to the result variable

res += whole

return res

# Function converts the value passed as parameter to it's decimal representation

def decimal_converter(num):

while num > 1:

num /= 10

return num

# Driver Code

# Take the user input for the floating point number

n = input("Enter your floating point value : \n")

# Take user input for the number of decimal places user want result as

p = int(input("Enter the number of decimal places of the result : \n"))

print(float_bin(n, places = p))

Output:

Enter your floating point value :

123.89

Enter the number of decimal places of the result :

4

1111011.1110


Program: 11 Date:

Task: Write Python program to convert float decimal to octal number

Approach :

To convert a decimal number having fractional part into octal, first convert the

integer part into octal form and then fractional part into octal form and finally

combine the two results to get the final answer.

For Integer Part, Keep dividing the number by 8 and noting down the remainder until

and unless the dividend is less than 8 and copy all the remainders together.

For the Decimal Part, Keep multiplying the decimal part with 8 until and unless we get

0 left as fractional part. After multiplying the first time, note down an integral part

and then again multiply the decimal part of new value by 8 and keep doing this until

perfect number is reached.

Code :

# Function returns the octal representation of the value passed as parameters. 'number'

# is floating point decimal number and 'places' is the number of decimal places

def float_octal(number, places = 3):

# split() seperates whole number and decimal part and stores it in two seperate

#variables

whole, dec = str(number).split(".")

# Convert both whole number and decimal part from string type to integer type

whole = int(whole)

dec = int (dec)

# Convert the whole number part to it's respective octal form and remove the

# "0o" from it.

res = oct(whole).lstrip("0o") + "."


Out put : Enter your floating point value :

129.45

Enter the number of decimal places of the result :

4

201.3463

# Iterate the number of times we want the number of decimal places to be

for x in range(places):

# Multiply the decimal value by 8 and seperate the whole number part and

#decimal part

whole, dec = str((decimal_converter(dec)) * 8).split(".")

# Convert the decimal part to integer again

dec = int(dec)

# keep adding the integer parts received to the result variable

res += whole

return res

# Function converts the value passed as parameter to it's respective decimal

# representation

def decimal_converter(num):

while num > 1:

num /= 10

return num

# Driver Code

# Take the user input for the floating point number

n = input("Enter your floating point value : \n")

# Take user input for the number of decimal places user would like the result as

p = int(input("Enter the number of decimal places of the result : \n"))

print(float_octal(n, places = p))


Program: 12 Date:

Approach: Conditions for a valid password are:

1. Should have at least one number.

2. Should have at least one uppercase and one lowercase character.

3. Should have at least one special symbol.

4. Should be between 6 to 20 characters long.

Task: Write Python program Password validation.

Code :

# Password validation in Python using naive method

# Function to validate the password

def password_check(passwd):

SpecialSym =['$', '@', '#', '%']

val = True

#for length should be at least 6

if len(passwd) < 6:

print('length should be at least 6')

val = False

#for length should be not be greater than 20

if len(passwd) > 20:

print('length should be not be greater than 20')

val = False

#for Password should have at least one numeral

if not any(char.isdigit() for char in passwd):

print('Password should have at least one numeral')

val = False

#for Password should have at least one uppercase letter

if not any(char.isupper() for char in passwd):

print('Password should have at least one uppercase letter')

val = False

#for Password should have at least one lowercase letter


Out put :

enter password for validation :Dbgyan@1234

Password is valid

enter password for validation :db@12

length should be at least 6

Password should have at least one uppercase letter

Invalid Password !!

if not any(char.islower() for char in passwd):

print('Password should have at least one lowercase letter')

val = False

#for checking Password should have at least one of the symbols $@#

if not any(char in SpecialSym for char in passwd):

print('Password should have at least one of the symbols $@#')

val = False

if val:

return val

# Main method

def main():

#user input for entering password

passwd = input("enter password for validation :")

#passwd='Dbgyan@1234'

if (password_check(passwd)):

print("Password is valid")

else:

print("Invalid Password !!")

# Driver Code

if __name__ == '__main__':

main()


Program: 13 Date:

Approach: One-time Passwords (OTP) is a password that is valid for only one login session or

transaction in a computer or a digital device. Now a days OTP’s are used in almost

every service like Internet Banking, online transactions etc. They are generally

combination of 4 or 6 numeric digits or a 6-digit alphanumeric.

Used Function:

random.random(): This function returns any random number between 0 to 1.

math.floor(): It returns floor of any floating number to a integer value.

Using the above function pick random index of string array which contains all the

possible candidates of a particular digit of the OTP.

Output :

OTP of 4 digits: 5471

OTP of 4 digits: 2077

Task: Python program to generate one-time password (OTP).

Code :

Method 1: Generate 4 digit Numeric OTP

# import library import math, random

# function to generate OTP

def generateOTP() :

# Declare a digits variable which stores all digits

digits = "0123456789"

OTP = ""

# length of password can be changed

# by changing value in range

for i in range(4) :

OTP += digits[math.floor(random.random() * 10)]

return OTP

# Driver code

if __name__ == "__main__" :

print("OTP of 4 digits:", generateOTP())


Output :

OTP of length 6: jMV3aj

OTP of length 6: 58GEeD

Method 1: Generate alphanumeric OTP of length 6.

# import library

import math, random

# function to generate OTP

def generateOTP() :

# Declare a string variable which stores all string

string = 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'

OTP = ""

length = len(string)

for i in range(6) :

OTP += string[math.floor(random.random() * length)]

return OTP

# Driver code

if __name__ == "__main__" :

print("OTP of length 6:", generateOTP())


Program: 14 Date:

Approach: pyqrcode module is a QR code generator. The module automates most of the building

process for creating QR codes. The terminology and the encodings used

in pyqrcode come directly from the standard.

Installation

$ pip install pyqrcode

Output :

#open file ‘dbgyanqr.svg’

Task: Python program to generate QR Code using pyqrcode module.

Code :

# Import QRCode from pyqrcode

import pyqrcode

from pyqrcode import QRCode

# String which represent the QR code

s = "www.dbgyan.wordpress.com"

# Generate QR code

url = pyqrcode.create(s)

# Create and save the svg

#file naming "dbgyanqr.svg"

url.svg("dbgyanqr.svg", scale = 12)


Program: 15 Date:

Approach: To get IP address of your computer in python, you have to first import socket library

and then use socket.gethostbyname(socket.gethostname()) code inside the print()

statement to print your IP address as output.

Output :

Want to get IP Address ? (y/n):

y

Your IP Address is: 192.168.1.101

Task: Python program to get IP Address.

Code :

# Python Program - Get IP Address

#import socket package.

import socket;

print("Want to get IP Address ? (y/n): ");

check = input();

if check == 'n':

exit();

else:

print("\nYour IP Address is: ",end="");

print(socket.gethostbyname(socket.gethostname()));


Program: 16 Date:

Approach: Python program ask from the user to enter the file name to open/create a file and again

ask to enter three lines of sentence to put those sentences in the file as the content of

the file.

Task: Python program to write a File.

Code :

# Python Program - Write to File

print("Enter 'x' for exit.");

#user input for file name.

filename = input("Enter file name to create and write content: ");

# if filename is 'x' then exit.

if filename == 'x':

exit();

else:

#opening /creating file for writing

c = open(filename, "w");

print("\nThe file,",filename,"created successfully!");

print("Enter 3 sentences to write on the file: ");

#user input for first sentences

sent1 = input("enter first sentences:");

#user input for second sentences

sent2 = input("enter second sentences:");


Output :

Enter 'x' for exit.

Enter file name to create and write content: data.txt

The file, data.txt created successfully!

Enter 3 sentences to write on the file:

enter first sentences:my name is Deepak Bhinde

enter second sentences:my blog is www.dbgyan.wordpress.com

enter third sentences:I am a computer professional.

Content successfully placed inside the file.!!

# data.txt

my name is Deepak Bhinde

my blog is www.dbgyan.wordpress.com

I am a computer professional.

#user input for third sentences

sent3 = input("enter third sentences:");

#write the sentences to entered file

c.write(sent1);

c.write("\n");

c.write(sent2);

c.write("\n");

c.write(sent3);

#closing file

c.close();

print("\nContent successfully placed inside the file.!!");


Program: 17 Date:

Approach: Python program ask from the user to enter name of a file along with their extension to

open and read all the content present inside that file and display the content of the

same file on the output screen.

Output : Enter 'x' for exit.

Enter file name (with extension) to read: data.txt

The file, data.txt opened successfully!

The file data.txt contains:




Task: Python program to read from the File.

Code :

# Python Program - Read a File


#user input for file name.

filename = input("Enter file name (with extension) to read: ");


if filename == 'x':

exit();

else:

#opening a file for reading

c = open(filename, "r");

print("\nThe file,",filename,"opened successfully!");

print("The file",filename,"contains:\n");

#read the file

print(c.read())

#closing of file

c.close()


Program: 18 Date:

Approach: Enter name of the first and second file, and then ask a file name to create a file to place

the merged content of the two file into this newly created file.

To merge the content of first and second file and put all the merged content from first

and second file into the third file, then open the first and second file to read content of

both the file, and then finally store the merged content of both files into another third

file to successfully perform the merging of two files into another file

Task: Python program to merge Two Files.

Code :

# Python Program - Merge Two Files

#import shutil

import shutil;


#user input for first file name.

filename1 = input("Enter first file name to merge: ");


if filename1 == 'x':

exit();

else:

#user input for second file name.

filename2 = input("Enter second file name to merge: ");

#user input for Create a new file to merge content.

filename3 = input("Create a new file to merge content of two file inside this file: ");

print();

print("Merging the content of two file in",filename3);

#open new file for merge

with open(filename3, "wb") as wfd:

for f in [filename1, filename2]:

with open(f, "rb") as fd:

shutil.copyfileobj(fd, wfd, 1024*1024*10);


Output :

Enter 'x' for exit.

Enter first file name to merge: data.txt

Enter second file name to merge: data1.txt

Create a new file to merge content of two file inside this file: merge.txt

Merging the content of two file in merge.txt

Content merged successfully.!

Want to see ? (y/n):

y

#merge.txt



I am a computer professional. Python is an interpreted, high-level, general-

purpose programming language.

Created by Guido van Rossum and first released in 1991.

print("\nContent merged successfully.!");

print("Want to see ? (y/n): ");

#user input for y/n

check = input();

if check == 'n':

exit();

else:

print();

c = open(filename3, "r");

print(c.read());

#closing file

c.close();


Program: 19 Date:

Approach:

Enter name of source and destination file to copy the content of source file into

destination file. After performing copy file operation, ask from the user, whether

he/she want to display the content of the destination file or not. If he/she want to show

the content, then just open the destination file and print all the content present inside

it which is the content of the source file.

Output :

Enter 'x' for exit.

Enter source file name (copy from): data.txt

Enter destination file name (copy to): new.txt

File copied successfully!

Want to display the content ? (y/n):

y




Task :Python program to copy one file to another file.

Code :

# Python Program - Copy Files

from shutil import copyfile;


sourcefile = input("Enter source file name (copy from): ");

if sourcefile == 'x':

exit();

else:

destinationfile = input("Enter destination file name (copy to): ");

copyfile(sourcefile, destinationfile);

print("File copied successfully!");

print("Want to display the content ? (y/n): ");

check = input();

if check == 'n':

exit();

else:

c = open(destinationfile, "r");

print(c.read());

c.close();


Program: 20 Date:

Approach:

To delete file in python, you have to import os library and use os.remove() function to

remove the desired file given by the user.

Output :

Enter 'x' for exit.

Enter name of file to delete: data1.txt

Removing the file....

File, data1.txt successfully deleted!!

Task:Python program to delete file.

Code :

# Python Program - Delete File

import os;


filename = input("Enter name of file to delete: ");

if filename == 'x':

exit();

else:

print("\nRemoving the file....");

os.remove(filename);

print("\nFile,",filename,"successfully deleted!!");


Program: 21 Date:

Task :Python program to implement a stack.

Approach:

1. Create a class Stack with instance variable items initialized to an empty list.

2. Define methods push, pop and is_empty inside the class Stack.

3. The method push appends data to items.

4. The method pop pops the first element in items.

5. The method is_empty returns True only if items is empty.

6. Create an instance of Stack and present a menu to the user to perform operations

on the stack.

Code :

#Create a class Stack

class Stack:

def __init__(self):

self.items = []

# Method is_empty returns True only if items is empty

def is_empty(self):

return self.items == []

# Push method inserted elements items

def push(self, data):

self.items.append(data)

# Pop method returns popped/deleted elements from items

def pop(self):

return self.items.pop()

# show method returns showed/display elements of items.

def show(self):

return self.items


Output: push <value>

pop

show

quit

Enter choose your operation ? push 67

push <value>

pop

show

quit


push <value>

pop

show

quit


push <value>

pop

show

quit

Enter choose your operation ? pop

Enter choose your operation ? show

[67, 89]

push <value>

pop

show

quit


Popped value: 89

push <value>

pop

show

quit


Popped value: 67

push <value>

pop

show

quit

push <value>

# create

s = Stack()

while True:

print('push <value>')

print('pop')

print('show')

print('quit')

do = input('Enter choose your operation ? ').split()

operation = do[0].strip().lower()

if operation == 'push':

s.push(int(do[1]))

elif operation == 'pop':

if s.is_empty():

print('Stack is empty.')

else:

print('Popped value: ', s.pop())

elif operation == 'quit':

break

elif operation == 'show':

print(s.show())


Program: 22 Date:

Task: Python program to implement a Queue.

Approach:

1. Create a class Queue with instance variable items initialized to an empty list.

2. Define methods enqueue, dequeue and is_empty inside the class Queue.

3. The method enqueue appends data to items.

4. The method dequeue dequeues the first element in items.

5. The method is_empty returns True only if items is empty.

6. Create an instance of Queue and present a menu to the user to perform operations

on the queue.

Code :

# create a class as Queue

class Queue:

def __init__(self):

self.items = []

# define method is_empty for empty values.

def is_empty(self):

return self.items == []

# define method enqueue for enter value in queue

def enqueue(self, data):

self.items.append(data)

# define method enqueue for deleting value in queue

def dequeue(self):

return self.items.pop(0)

# define method show for display value

def show(self):

return self.items


Output: insert <value>

pop

show

quit

What would you like to do? insert 34

insert <value>

pop

show

quit


insert <value>

pop

show

quit


insert <value>

pop

show

quit

What would you like to do? show

[34, 70, 50]

insert <value>

pop

show

quit

What would you like to do? pop

poped value: 34

insert <value>

pop

show

quit

What would you like to do? show

[70, 50]

insert <value>

pop

show

quit

What would you like to do?

q = Queue()

while True:

print('insert <value>')

print('pop')

print('show')

print('quit')

do = input('What would you like to do? ').split()

operation = do[0].strip().lower()

if operation == 'insert':

q.enqueue(int(do[1]))

elif operation == 'pop':

if q.is_empty():

print('Queue is empty.')

else:

print('poped value: ', q.dequeue())

elif operation == 'quit':

break

elif operation == 'show':

print(q.show())


Program: 23 Date:

Task: Compute EMIs for a loan using the numpy or scipy libraries.

.

Approach:

1. import the numpy and scipy libararies.

2. Take the input from interest , years and loan_value .

3. calculate monthly_rate , number_month and monthly_payment.

4. print the output.

Code :

# import numpy pakage

import numpy as np

# take the user input as rate of interest

interest = float(input("enter rate of Interest ->"))

annual_rate = interest/100.0

monthly_rate = annual_rate/12

# take the user input as years

years = float(input("enter the years:"))


Output:

enter rate of Interest ->8.3

enter the years:25

enter Loan Amount Rs:3840000

Paying off a loan of Rs3,840,000.0 over 25.0 years at

8.3% interest, your monthly payment will be Rs.30,404.90

number_month = years * 12

# take the user input as loan amount

loan_value = float(input("enter Loan Amount Rs:"))

# calculate monthly payment

monthly_payment = abs(np.pmt(monthly_rate, number_month, loan_value))

sf1 = "Paying off a loan of Rs{:,} over {} years at"

sf2 = "{}% interest, your monthly payment will be Rs.{:,.2f}"

# print the output

print(sf1.format(loan_value, years))

print(sf2.format(interest, monthly_payment))


Program: 24 Date:

Task: Create a graphical application that accepts user inputs , performs some

operation on them and the writes the output on the screen . for example , write

small calculator. Use the tkinter library.

Approach:

1. Importing the module – tkinter 2. Create the main window (container) 3. Add any number of widgets to the main window 4. Apply the event Trigger on the widgets

Code :

# import everything from tkinter module

from tkinter import *

# globally declare the expression variable

expression = ""

# Function to update expressiom in the text entry box

def press(num):

# point out the global expression variable global expression

# concatenation of string

expression = expression + str(num)

# update the expression by using set method

equation.set(expression)


# Function to evaluate the final expression

def equalpress():

# Try and except statement is used for handling the errors like zero division error

# etc. Put that code inside the try block which may generate the error

try:

global expression

# eval function evaluate the expression and str function convert the result

# into string

total = str(eval(expression))

equation.set(total)

# initialze the expression variable by empty string

expression = ""

# if error is generate then handle by the except block

except:

equation.set(" error ")

expression = ""

# Function to clear the contents of text entry box

def clear():

global expression

expression = ""

equation.set("")


# Driver code

if __name__ == "__main__":

# create a GUI window

gui = Tk()

# set the background colour of GUI window

gui.configure(background="light green")

# set the title of GUI window

gui.title("Simple Calculator")

# set the configuration of GUI window

gui.geometry("265x125")

# StringVar() is the variable class we create an instance of this class

equation = StringVar()

# create the text entry box for showing the expression .

expression_field = Entry(gui, textvariable=equation)

# grid method is used for placing the widgets at respective positions

# in table like structure .

expression_field.grid(columnspan=4, ipadx=70)

equation.set('enter your expression')

# create a Buttons and place at a particular


# location inside the root window .

# when user press the button, the command or

# function affiliated to that button is executed .

button1 = Button(gui, text=' 1 ', fg='black', bg='red',

command=lambda: press(1), height=1, width=7)

button1.grid(row=2, column=0)





























plus = Button(gui, text=' + ', fg='black', bg='red',

command=lambda: press("+"), height=1, width=7)

plus.grid(row=2, column=3)

minus = Button(gui, text=' - ', fg='black', bg='red',

command=lambda: press("-"), height=1, width=7)

minus.grid(row=3, column=3)

multiply = Button(gui, text=' * ', fg='black', bg='red',

command=lambda: press("*"), height=1, width=7)

multiply.grid(row=4, column=3)


divide = Button(gui, text=' / ', fg='black', bg='red',

command=lambda: press("/"), height=1, width=7)

divide.grid(row=5, column=3)

equal = Button(gui, text=' = ', fg='black', bg='red',

command=equalpress, height=1, width=7)

equal.grid(row=5, column=2)

clear = Button(gui, text='Clear', fg='black', bg='red',

command=clear, height=1, width=7)

clear.grid(row=5, column='1')

# start the GUI

gui.mainloop()

Output:


Approach :

1. importing the required module

2. define x and y axies values

3. plotting points corresponding x and y axies

4. define the label of x and y axies

5. display the graph

Program: 25 Date:

Task : Program to implement to plot function y=X^2 using pyplot or matplotlib

libraries.

Code :

# importing the required module

import matplotlib.pyplot as plt

# x axis values

x = [1,2,3]

# corresponding y axis values

y = [2,4,1]

# plotting the points

plt.plot(x, y)

# naming the x axis


plt.xlabel('x - axis')

# naming the y axis

plt.ylabel('y - axis')

# giving a title to my graph

plt.title('Function y=X^2')

# function to show the plot

plt.show()

Output :

Documents

Python Program 1.2...DEEPAK BHINDE PGT COMPUTER SCIENCE PYTHON PROGRAMS 1.2 PAGE 2 No. Program 1. Task: Python program to convert time from 12 hour to 24 hour format 2. Task: Python