Python Assignment 2

 Assignment 2 : Strings and Functions

Lab Assignments

SET A

Strings

1) Write a python program to check whether the string is Symmetrical or Palindrome.

def palindrome(a): 

    mid = (len(a)-1)//2

    start = 0

    last = len(a)-1

    flag = 0

      while(start<mid): 

           if (a[start]== a[last]): 

            start += 1

            last -= 1

              

        else: 

            flag = 1

            break; 

     if flag == 0: 

        print("The entered string is palindrome") 

    else: 

        print("The entered string is not palindrome") 

                  

def symmetry(a): 

    n = len(a) 

    flag = 0

       

    if n%2: 

        mid = n//2 +1

    else: 

        mid = n//2

     start1 = 0

    start2 = mid 

      

    while(start1 < mid and start2 < n): 

          if (a[start1]== a[start2]): 

            start1 = start1 + 1

            start2 = start2 + 1

        else: 

            flag = 1

            break

    if flag == 0: 

        print("The entered string is symmetrical") 

    else: 

        print("The entered string is not symmetrical") 

          

string = 'amaama'

palindrome(string) 

symmetry(string) 

2) Write a python program to Reverse words in a given String

def rev_words(string):  

    words = string.split(' ') 

    rev = ' '.join(reversed(words)) 

    return rev

s= "Python is good"

print ("reverse: ",rev_words(s))

s2= "Hello from Study tonight"

print ("reverse: ",rev_words(s2))

3) Write a python program to remove i’th character from string in different ways

1. By using Naive method
2. By using replace() function
3. By using slice and concatenation
4. By using join() and list comprehension
5. By using translate() method

1. Removing a Character from String using the Naive method

input_str = "DivasDwivedi"

   # Printing original string  

print ("Original string: " + input_str) 

   result_str = "" 

   for i in range(0, len(input_str)): 

    if i != 3: 

        result_str = result_str + input_str[i] 

   # Printing string after removal   

print ("String after removal of i'th character : " + result_str)

2. Removal of Character from a String using replace() Method

str = "Engineering"

print ("Original string: " + str) 

res_str = str.replace('e', '') 

print ("The string after removal of character: " + res_str) 

res_str = str.replace('e', '', 1) 

print ("The string after removal of character: " + res_str) 

3. Removal of Character from a String using Slicing and Concatenation

str = "Engineering"

print ("Original string: " + str) 

  res_str = str[:2] +  str[3:] 

print ("String after removal of character: " + res_str) 

4. Removal of Character from a String using join() method and list comprehension

str = "Engineering"

print ("Original string: " + str) 

res_str = ''.join([str[i] for i in range(len(str)) if i != 2]) 

print ("String after removal of character: " + res_str) 

5. Removal of character from a string using translate() method

str = 'Engineer123Discipline'

print(str.translate({ord(i): None for i in '123'}))

Functions

1) Write a Python function to find the Max of three numbers.

def max_of_two( x, y ):

    if x > y:

        return x

    return y

def max_of_three( x, y, z ):

    return max_of_two( x, max_of_two( y, z ) )

print(max_of_three(3, 6, -5))

2) Write a Python function to sum all the numbers in a list.

def sum(numbers):

    total = 0

    for x in numbers:

        total += x

    return total

print(sum((8, 2, 3, 0, 7)))

3) Write a Python program to reverse a string.

def reverse(str):

    string = " "

    for i in str:

        string = i + string

    return string

str = "PythonGuides"

print("The original string is:",str)

print("The reverse string is:", reverse(str)) 

SET B

Strings

1. Write a python program to print even length words in a string

def PrintEvenWords(s):

    s=s.split(' ')

    for word in s:

        if len(word)%2==0:

            print(word)

string= " Python is good for me"

PrintEvenWords(string)

2. Write a python program to accept the strings which contains all vowels

#function

def CheckString(s):

    s = s.lower()

    vowels = set("aeiou")

    for char in s:

        if char in vowels:

            vowels.remove(char)

    if len(vowels) == 0:

        print("Accepted")

    else:

        print("Not accepted")

s1= "AeBIdeffoBUw"

print(s1)

CheckString(s1)

s2="python"

print(s2)

CheckString(s2)

3. Write a python program to Count the Number of matching characters in a pair of string

Method 1:-

def cnt(s1, s2):

    c=0 #counter variable

    j=0

    for i in s1:

        if s2.find(i)>-0 and j==s1.find(i):

            c=c+1

        j=j+1

    print("Matching char: ",c)

s1="aabcdefk12"

s2="b2acdefk1"

cnt(s1,s2)

Method 2:-

def cnt(s1, s2):

    char_of_s1=set(s1)

    char_of_s2=set(s2)    

   same_char= char_of_s1 & char_of_s2

    print("Matching Characters: ",len(same_char))

s1="abgfhij2@1"

s2="@1khgabop"

cnt(s1,s2)

Functions

1. Write a Python function that takes a list and returns a new list with unique elements of the first list.

def unique_list(l):

  x = []

  for a in l:

    if a not in x:

      x.append(a)

  return x

print(unique_list([1,2,3,3,3,3,4,5])) 

2. Write a Python function that takes a number as a parameter and check the number is prime or not.

def chk_prime(n):

    if (n==1):

        return False

    elif (n==2):

        return True;

    else:

        for x in range(2,n):

            if(n % x==0):

                return False

        return True             

print(chk_prime(9))

3. Write a Python function to check whether a number is perfect or not.

def perfect_no(n):

    sum = 0

    for x in range(1, n):

        if n % x == 0:

            sum += x

    return sum == n

print(perfect_no(6))

PROGRAMS FOR PRACTICE:

1. Write a Python program to append items from a specified list.

2. Write a python program Check if a Substring is Present in a Given String

3. Write a python program Words Frequency in String Shorthands

4. Write a python program Convert Snake case to Pascal case

5. Write a Python function to calculate the factorial of a number (a non-negative integer). The function

accepts the number as an argument.

6. Write a Python function to check whether a number is in a given range.

7. Write a Python function that accepts a string and calculate the number of upper case letters and lower

case letters.

8. Write a Python program to detect the number of local variables declared in a function.

9. Write a python program to Remove all duplicates from a given string in Python

10. Write a Python function that checks whether a passed string is palindrome or not.

Outside the function : 30

47

11. Write a Python program that accepts a hyphen-separated sequence of words as input and prints the

words in a hyphen-separated sequence after sorting them alphabetically.

Sample Items : green-red-yellow-black-white Expected Result : black-green-red-white-yellow

12. Write a Python function to create and print a list where the values are square of numbers between 1

and 50 (both included).

13. Write a Python program to execute a string containing Python code.

14. Write a Python program to access a function inside a function