CodeKaroYaaro PPT python (4)
                     GETTING TO 
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TE          A       PYTCHON PRHOGRAMEMING                              PART-(4) R
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COMPOUND DATA: LIST, TUPLE,DICTIONARY 
What are tuples in Python?
 A tuple is another sequence data type that is similar to the list. A tuple consists ofa 
number of values separated by commas. Unlike lists, however, tuples are enclosed within 
parentheses.
What is the difference between tuples and lists in Python?
 The main differences between lists and tuples are – Lists are enclosed in brackets ( [ ] ) 
and their elements and size can be changed, while tuples are enclosed in parentheses 
( ( ) ) and cannot be updated. Tuples can be thought of as read- only lists.
What are Python's dictionaries? 
Python's dictionaries are kind of hash table type. They work like associative arrays or 
hashes found in Perl and consist of key-value pairs. A dictionary key can be almost any 
Python type, but are usually numbers or strings. Values, on the other hand, can be any 
arbitrary Python object.
Explain how to create a dictionary in python? 
Dictionaries are enclosed by curly braces ({ }) and values can be assigned and accessed 
using square braces ([]). 
dict = {} 
dict['one'] = "This is one”
 dict[2] = "This is two”
 tinydict = {'name': 'john','code':6734, 'dept': 'sales'}
Explain what is range() function and how it is used in lists? 
The range function returns an immutable sequence object of integers between the given 
start integer to the stop integer
 range(start,stop,[step]) 
>>>f 
or I 
In
 range(1,10,2): 
print(i,end=‖―) 1 35 7 9
How lists are updated in Python?
 The append() method is used to add elements to a list. 
Syntax: 
list.append(obj) 
List=[123,‘VR
B‘] List.append(2017)
 Print(―
 Updat
 ed
 List:1,
 List)
 Output: Updated List: [123,‘VRB‘,2017] 
Write a few methods that are used in Python Lists. 
• append()- add an element to end of list 
• insert()- insert an item at the defined index
• remove()- removes an item from the list 
• clear()- removes all items from the list 
• reverse()- reverse the order of items in the list
 What are the advantages of Tuple over List? 
•  Tuple is used for heterogeneous data types and list is used for 
homogeneous data types. 
• Since tuple are immutable, iterating through tuple is faster than with list. 
•  Tuples that contain immutable elements can be used as key for 
dictionary. 
• Implementing data that doesn‘t change as a tuple remains write-
protected
What is indexing and negative indexing in Tuple?
 The index operator is used to access an item in a tuple where index starts from 0. 
Python also allows negative indexing where the index of -1 refers to the last item, 
-2 to the second last item and so on. 
>>>my_tuple=(‗p‘,‘y‘,‘t‘,‘h‘,‘o‘,‘n‘) 
>>>print(my_tuple[5] 
) n
 >>>print(m
 y_tuple[- 
6]) p 
What is the output of print tuple[1:3] if tuple = ( 'abcd', 786 , 
2.23, 'john', 70.2)?
 In the given command, tuple[1:3] is accessing the items in tuple using indexing. 
It will print elements starting from 2nd 
till 3rd. Output will be (786, 2.23). 
 What are the methods that are used in Python Tuple?
 
Methods that add items or remove items are not available with tuple. Only the 
following two methods are available: 
• count(x)- returns the number of items that is equal to x 
• index(x)- returns index of first item that is equal to x
 Is tuple comparison possible? Explain how with 
example. 
The standard comparisons (‗‘,‘=‘,‘==‘) work exactly the same 
among tuple objects. The tuple objects are compared element by element. 
>>>a=(1,2,3,4,5) 
>>>b=(9,8,7,6,5) 
>>>a< 
b True
What are the built-in functions that are used in Tuple?
•  all()- returns true if all elements of the tuple are true or if tuple is empty 
•  any()- returns true if any element of tuple is true 
•  len()- returns the length in the tuple
•  max()- returns the largest item in tuple 
•  min()- returns the smallest item in tuple 
•  sum()- returns the sum of all elements in tuple
Explain what is dictionary and how it is created in Python? 
Dictionaries are similar to other compound types except that they can use any 
immutable type as an index. One way to create a dictionary is to start with the 
empty dictionary and add elements. The empty dictionary is denoted {}: 
>>> eng2sp = {} 
>>> eng2sp[‘one‘] = ‘uno‘ 
>>> eng2sp[‘two‘] = ‘dos‘ 
What is meant by key-value pairs in a dictionary?
The elements of a dictionary appear in a comma-separated list. Each entry 
contains an index and a value separated by a colon. In a dictionary, the 
indices are called keys, so the elements are called key-value pairs.>>> print 
eng2sp {‘one‘: ‘uno‘, ‘two‘: ‘dos‘}
How does del operation work on dictionaries?Give an 
example.
The del statement removes a key-value pair from a dictionary. For example, 
the following dictionary contains the names of various fruits and the number 
of each fruit in stock: 
>>> inventory = {‘apples‘: 430, ‘bananas‘: 312, ‘oranges‘: 525, ‘pears‘: 217} 
>>> print inventory {‘oranges‘: 525, ‘apples‘: 430, ‘pears‘: 217, ‘bananas‘: 
312} 
If someone buys all of the pears, we can remove the entry from the dictionary: 
>>> del inventory[‘pears‘] 
>>> print inventory 
{‘oranges‘: 525, ‘apples‘: 430, ‘bananas‘: 312}
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