ANSWER :

ANSWER :

12.1 There are Four ways in converting a Dictionary into a Tuple & are as follows:

12.1.1 Using list comprehension

Refer Fig 12.1

12.1.2 Using items()

Refer Fig 12.1

12.1.3 Using zip

Refer Fig 12.1

12.1.4 Using iteration

Refer Fig 12.1

Fig 12.1

Fig 12.2

ANSWER :

Because tuples are hashable and lists are not, if we want to create a composite key to use in a dictionary we must use a tuple as the key.

We would encounter a composite key if we wanted to create a telephone directory that maps from last-name, first-name pairs to telephone numbers. Assuming that we have defined the variables last, first, and number, we could write a dictionary assignment statement as follows:

directory[last,first] = number

The expression in brackets is a tuple. We could use tuple assignment in a for loop to traverse this dictionary.

for last, first in directory:

print(first, last, directory[last,first])

This loop traverses the keys in directory, which are tuples. It assigns the elements of each tuple to last and first, then prints the name and corresponding telephone number.

ANSWER :

13.1 List Operations:

Python allows to use operators + and * on lists.

The operator + uses two list objects and returns concatenation of those two lists. Whereas * operator take one list object and one integer value, say n, and returns a list by repeating itself for n times.

Fig 13.1 List Operations

Fig 13.2 Output of List Operations

13.2 List Methods:

13.2.1 Demonstration of these Methods:

Fig 13.3 Use of various list Methods

Fig 13.4 Output of Use of various list Methods

13.3 Program to accept 'n' numbers from user, find sum all even numbers and product of all odd numbers in entered list :

Fig 13.5 Program to sum even number & product odd Number

Fig 13.6 Output of Program to sum even number & product odd Number

Fig 13.7 Output of Program to sum even number & product odd Number

ANSWER :

14.1 Merits of Dictionary over lists:

Refer 4^th Question & Answer or Click Here

14.2 Program to accept USN and marks obtained, find maximum, minimum and students USN who have scored in the range 100-85, 85-75, 75-60 and below 60 marks separately.

Fig14.1 Program to Evaluate Students Marks

Fig14.2 Output of Program to Evaluate Students Marks