Python Assignment 3

 Assignment 3 - List, Tuples, Sets, and Dictionary

SET A

List

1) Write a Python program to sum all the items in a list.

def sum_list(items):

    sum_numbers = 0

    for x in items:

        sum_numbers += x

    return sum_numbers

print(sum_list([1,2,-8]))

2) Write a Python program to multiplies all the items in a list.

def multiply_list(items):

    tot = 1

    for x in items:

        tot *= x

    return tot

print(multiply_list([1,2,-8]))

3) Write a Python program to get a list, sorted in increasing order by the last element in each tuple from a given list of non-empty tuples.

def last(n): return n[-1]

def sort_list_last(tuples):

  return sorted(tuples, key=last)

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

Tuples

1) Write a Python program to create a tuple.

# Creating an empty Tuple

Tuple1 = ()

print("Initial empty Tuple: ")

print(Tuple1)

# Creating a Tuple

Tuple1 = ('Geeks', 'For')

print("\nTuple with the use of String: ")

print(Tuple1)

# Creating a Tuple with the use of list

list1 = [1, 2, 4, 5, 6]

print("\nTuple using List: ")

print(tuple(list1))

# Creating a Tuple with the use of built-in function

Tuple1 = tuple('Geeks')

print("\nTuple with the use of function: ")

print(Tuple1)

2) Write a Python program to create a tuple with different data types.

# Creating a Tuple with Mixed Datatype

Tuple1 = (5, 'Welcome', 7, 'Geeks')

print("\nTuple with Mixed Datatypes: ")

print(Tuple1)

3) Write a Python program to check whether an element exists within a tuple.

test_tup = (10, 4, 5, 6, 8)

 print("The original tuple : " + str(test_tup))

N = 6

res = False

for ele in test_tup :

    if N == ele :

        res = True

        break

print("Does tuple contain required value ? : " + str(res))

Sets

1) Write a Python program to create a set.

print("Create a new set:")

x = set()

print(x)

print(type(x))

print("\nCreate a non empty set:")

n = set([0, 1, 2, 3, 4])

print(n)

print("\nUsing a literal:")

a = {1,2,3,'foo','bar'}

print(a)

2) Write a Python program to iterate over sets.

num_set = set([0, 1, 2, 3, 4, 5])

for n in num_set:

  print(n, end=' ')

print("\n\nCreating a set using string:")

char_set = set("w3resource")  

# Iterating using for loop

for val in char_set:

    print(val, end=' ')

3) Write a Python program to create set difference.

setn1 = set([1, 1, 2, 3, 4, 5])

setn2 = set([1, 5, 6, 7, 8, 9])

print("\nOriginal sets:")

print(setn1)

print(setn2)

r1 = setn1.difference(setn2)

print("\nDifference of setn1 - setn2:")

print(r1)

r2 = setn2.difference(setn1)

print("\nDifference of setn2 - setn1:")

print(r2)

Dictionary

1) Write a Python script to sort (ascending and descending) a dictionary by value.

import operator

d = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}

print('Original dictionary : ',d)

sorted_d = sorted(d.items(), key=operator.itemgetter(1))

print('Dictionary in ascending order by value : ',sorted_d)

sorted_d = dict( sorted(d.items(), key=operator.itemgetter(1),reverse=True))

print('Dictionary in descending order by value : ',sorted_d)

2) Write a Python script to add a key to a dictionary.

d = {0:10, 1:20}

print(d)

d.update({2:30})

print(d)

3) Write a Python program to iterate over dictionaries using for loops.

d = {'Red': 1, 'Green': 2, 'Blue': 3} 

for color_key, value in d.items():

     print(color_key, 'corresponds to ', d[color_key]) 

SET B

List

1. Write a Python program to remove duplicates from a list.

a = [10,20,30,20,10,50,60,40,80,50,40]

dup_items = set()

uniq_items = []

for x in a:

    if x not in dup_items:

        uniq_items.append(x)

        dup_items.add(x)

print(dup_items)

2. Write a Python program to check a list is empty or not.

my_list = []

if not len(my_list):

    print("the list is empty")

Tuples

1. Write a Python program to convert a list to a tuple.

listx = [5, 10, 7, 4, 15, 3]

print(listx)

tuplex = tuple(listx)

print(tuplex)

2. Write a Python program to remove an item from a tuple.

tuplex = "S","H","R","A","D","D","H","A"

print(tuplex)

tuplex = tuplex[:2] + tuplex[3:]

print(tuplex)

listx = list(tuplex) 

listx.remove("H") 

tuplex = tuple(listx)

print(tuplex)

3. Write a Python program to slice a tuple.

tuplex = (2, 4, 3, 5, 4, 6, 7, 8, 6, 1)

_slice = tuplex[3:5]

print(_slice)

#if the start index isn't defined, is taken from the beg inning of the tuple

_slice = tuplex[:6]

print(_slice)

#if the end index isn't defined, is taken until the end of the tuple

_slice = tuplex[5:]

print(_slice)

#if neither is defined, returns the full tuple

_slice = tuplex[:]

print(_slice)

#The indexes can be defined with negative values

_slice = tuplex[-8:-4]

print(_slice)

4. Write a Python program to find the length of a tuple.

tuplex = tuple("Shraddha")

print(tuplex)

print(len(tuplex))

Sets

1. Write a Python program to check if a set is a subset of another set.

print("Check if a set is a subset of another set, using comparison operators and issubset():\n")

setx = set(["apple", "mango"])

sety = set(["mango", "orange"])

setz = set(["mango"])

print("x: ",setx)

print("y: ",sety)

print("z: ",setz,"\n")

print("If x is subset of y")

print(setx <= sety)

print(setx.issubset(sety))

print("If y is subset of x")

print(sety <= setx)

print(sety.issubset(setx))

print("\nIf y is subset of z")

print(sety <= setz)

print(sety.issubset(setz))

print("If z is subset of y")

print(setz <= sety)

print(setz.issubset(sety))

2. Write a Python program to find maximum and the minimum value in a set.

setn = {5, 10, 3, 15, 2, 20}

print("Original set elements:")

print(setn)

print(type(setn))

print("\nMaximum value of the said set:")

print(max(setn))

print("\nMinimum value of the said set:")

print(min(setn))

3. Write a Python program to find the length of a set.

setn = {5, 10, 3, 15, 2, 20}

print("Original set elements:")

print(setn)

print(type(setn))

print("\nLength of the said set:")

print(len(setn))

setn = {2,2,2,2,2}

print("Original set elements:")

print(setn)

print(type(setn))

print("\nLength of the said set:")

print(len(setn))

setn = {3,3,3,3,3,3,5}

print("Original set elements:")

print(setn)

print(type(setn))

print("\nLength of the said set:")

print(len(setn))

Dictionary

1. Write a Python script to generate and print a dictionary that contains a number (between 1 and n) in the form (x, x*x).

n=int(input("Input a number "))

d = dict()

for x in range(1,n+1):

    d[x]=x*x

print(d) 

2. Write a Python script to merge two Python dictionaries.

d1 = {'a': 100, 'b': 200}

d2 = {'x': 300, 'y': 200}

d = d1.copy()

d.update(d2)

print(d)

3. Write a Python program to get a dictionary from an object's fields.

class Obj_Dictionary(object):

     def __init__(self):

         self.x = 'red'

         self.y = 'Yellow'

         self.z = 'Green'

     def do_nothing(self):

         pass

test = Obj_Dictionary()

print(test.__dict__)

PROGRAMS FOR PRACTICE:

1. Write a Python program to get the largest number from a list.

2. Write a Python program to get the smallest number from a list.

3. Write a Python program to count the number of strings where the string length is 2 or more and the

first and last character are same from a given list of strings.

4. Write a Python program to add an item in a tuple.

5. Write a Python program to convert a tuple to a string.

6. Write a Python program to create the colon of a tuple.

7. Write a Python program to unpack a tuple in several variables.

8. Write a Python program to add member(s) in a set.

9. Write a Python program to remove item(s) from set

10. Write a Python program to create an intersection of sets.

11. Write a Python program to create a union of sets.

12. Write a Python script to concatenate following dictionaries to create a new one.

13. Write a Python program to map two lists into a dictionary.

14. Write a Python program to sort a dictionary by key.

15. Write a Python program to get the maximum and minimum value in a dictionary.

16. Write a Python program to clone or copy a list.

17. Write a Python program to find the list of words that are longer than n from a given list of words.

18. Write a Python program to unzip a list of tuples into individual lists.

19. Write a Python program to reverse a tuple.

20. Write a Python program to convert a list of tuples into a dictionary.

21. Write a Python program to print a tuple with string formatting.

22. Write a Python program to create a symmetric difference.

23. Write a Python program to check if a given value is present in a set or not.

24. Write a Python program to check if a given set is superset of itself and superset of another given set.

25. Write a Python program to check a given set has no elements in common with other given set.

26. Write a Python program to remove the intersection of a 2nd set from the 1st set.

27. Write a Python program to remove duplicates from Dictionary.

28. Write a Python script to check whether a given key already exists in a dictionary.

29. Write a Python program to sum all the items in a dictionary.

30. Write a Python program to multiply all the items in a dictionary.

31. Write a Python program to remove a key from a dictionary.