Page 402 - Computer Science V2.0 Class 11

● Multiplication Operator *: The multiplication operator concatenates the string the specified number of times.
>>> greetings * 2
('Good Morning', 'Good Afternoon', 'Good Morning', 'Good Afternoon')

>>> greetings * 0
()
● Membership operator in:

>>> 'Good Afternoon' in greetings # Membership operation in
True

Program 13.4 Define a function wordLength(lst) which takes a list of words and returns a list of tuples
where each tuple comprises a word and its corresponding length. Make use of the function wordLength() to
write a program that accepts a list of words from a user and prints a list of tuples where each tuple is word-length
pair, that is, word and its corresponding length.
01 def wordLength(lst):
02 '''
03 Purpose: To return word-length pairs for the words in a list.
04 Input Parameter: lst - list containing words
05 Return Value: List of (word, length) tuples
06 '''
07 '''
08 Approach:
09 initialise an empty word-length list wordLenPairs
10 for each word in lst:
11 append the tuple (word, length) to wordLenPairs
12 '''
13 wordLenPairs = list()
14 for word in lst:
15 wordLenPairs.append((word, len(word)))
16 return wordLenPairs
17
18
19 #Objective: Accept a word-list from a user and print list of (word.lenngth)tuples
20
21 lst = eval(input('Enter the list: '))
22 print('List of tuples:: ', wordLength(lst))
Sample Output:

>>> Enter the list: ['ORANGE','EDUCATION']
List of tuples:: [('ORANGE', 6), ('EDUCATION', 9)]
13.9 Tuple Methods

Python provides several methods for manipulating the tuples. Like a string, a tuple is also an immutable object, All
the methods that operate on a tuple leave the original tuple unchanged. To invoke a method associated with a tuple
object, the tuple object is followed by a dot, followed by the method's name, followed by a pair of parentheses that
enclose the arguments (if any) required for invoking the method. Next, we describe the functionality of some methods

for the tuple objects on a tuple object, say, tpl.
1. tpl.count(value): The method returns the number of occurrences of the given value in a tuple.

Examples:
>>> (0, 1, 2, 3, 2, 3, 1, 3, 2).count(2)
3
>>> age = (20, 18, 17, 19, 18, 18)
>>> age.count(18)
2

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