Write a program to copy odd lines of one file to another file - Python

Write a program to copy odd lines of one file to another file

file1 = open('file1.txt', 'r') 
file2 = open('file2.txt', 'w') 

lines = file1.readlines() 
type(lines) 
for i in range(0, len(lines)): 
    if(i % 2 != 0): 
        file2.write(lines[i]) 

file1.close()
file2.close() 

file1 = open('file1.txt', 'r') 
file2 = open('file2.txt', 'r') 

str1 = file1.read()
str2 = file2.read()

print("file1 content...")
print(str1)

print() # to print new line

print("file2 content...")
print(str2)

file1.close()
file2.close()

Write a program to reverse a string that contains digits in Python

def reverse(n):
    s=str(n) 
    p=s[::-1]
    return p 

num = int(input('Enter a positive value: '))
print('The reverse integer:',reverse(num))

Write a program to input a string and find total number uppercase and lowercase letters

print("Input a string: ")
str1 = input()

no_of_ucase, no_of_lcase = 0,0

for c in str1:
    if c>='A' and c<='Z':
        no_of_ucase += 1
    if c>='a' and c<='z':
        no_of_lcase += 1

print("Input string is: ", str1)
print("Total number of uppercase letters: ", no_of_ucase)
print("Total number of lowercase letters: ", no_of_lcase)

Write a program to input a string and find total number of letters and digits

print("Input a string: ")
str1 = input()

no_of_letters, no_of_digits = 0,0

for c in str1:
    if (c>='a' and c<='z') or (c>='A' and c<='Z'):
        no_of_letters += 1
    if c>='0' and c<='9':
        no_of_digits += 1

print("Input string is: ", str1)
print("Total number of letters: ", no_of_letters)
print("Total number of digits: ", no_of_digits)

Write a python function to implement tower of hanoi

def hanoi(disks, source, auxiliary, target):
    if disks == 1:
        print('Move disk 1 from peg {} to peg {}.'.format(source, target))
        return

    hanoi(disks - 1, source, target, auxiliary)
    print('Move disk {} from peg {} to peg {}.'.format(disks, source, target))
    hanoi(disks - 1, auxiliary, source, target)

Write a python program to implement a Stack using One Queue

class Stack:
    def __init__(self):
        self.q = Queue()

    def is_empty(self):
        return self.q.is_empty()

    def push(self, data):
        self.q.enqueue(data)

    def pop(self):
        for _ in range(self.q.get_size() - 1):
            dequeued = self.q.dequeue()
            self.q.enqueue(dequeued)
        return self.q.dequeue()


class Queue:
    def __init__(self):
        self.items = []
        self.size = 0

    def is_empty(self):
        return self.items == []

    def enqueue(self, data):
        self.size += 1
        self.items.append(data)

    def dequeue(self):
        self.size -= 1
        return self.items.pop(0)

    def get_size(self):
        return self.size


s = Stack()

print('Menu')
print('push <value>')
print('pop')
print('quit')

while True:
    do = input('What would you like to do? ').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