Python Scripting - Week 4

Question 1

What are containers in Python ?

Answer 1

To save multiple values in one object, containers are used

Question 2

How many type of containers are in Python

Answer 2

There are four types of containers in Python
1. Lists
2. Tuples
3. Dictionaries
4. Sets

Question 3

List in Python surrounded by

Answer 3

Square brackets []

Question 4

How items are separated in list

Answer 4

Items in list are separated by comma

Question 5

What type of values we put in a list

Answer 5

We put any type of value in list

Question 6

What is indices in list

Answer 6

List have index positions, starts with 0 and and with total length of List

Question 7

Can we slice the list

Answer 7

Yes we can slice the list,

Question 8

What is the format of list slicing

Answer 8

[start,stop,step]

Question 9

How to assign values to list

Answer 9

list1=[1,2,3,4]
list1[1]=”Hello”
list1=[i for i in range(10)]

Question 10

How to insert a new value to a list ?

Answer 10

To insert and value to an list insert() method is used.
Index position is required to insert a value to a list
list1=[1,2,3]
list1.insert(1,20)

Question 11

How to remove an item from list

Answer 11

We have to use remove method
list1.remove(4)
It removes first occurrence of value
list1.pop(2)
removes value at given index

Question 12

What are the basic operations on list

Answer 12

1. Assignment
2. Insert
3. Delete
4. Append
5. search

Question 13

How to delete an item from last

Answer 13

We have to use pop method
In delete the last item permanently and also returns it
list1.pop()

Question 14

How to concatenate two lists

Answer 14

a = [1,2,3,4]
B = [2,3,4,5]
c= a+b

Question 15

Can you put list in a list

Answer 15

Yourwe can put list in a list
~~~
[a = [1,2,3,4]
list1+=[4,4,4,[5,5]]]
~~~

Question 16

How to create a tuple

Answer 16

Tuples are created using brackets
mytuple = (1,2,3)

Question 17

What types of values can be put in a tuple

Answer 17

We can put any type of values in a tuple

Question 18

What kind of operations we can perform on Tuple

Answer 18

Tuples are immutable objects we cannot add or Delete anything inside the tuple

Question 19

What are the methods of tuple ?

Answer 19

Index() and and count()

Question 20

What is the use of index method in tuples

Answer 20

Index method is used to get index position of given value,
IT returns the index value of first occurrence of given value

Question 21

What is the use of count method in truple

Answer 21

Count method is used to get, how many times a value appears in a tuple

Question 22

Can we concatenate tuple

Answer 22

Yes we can
a = (1,2)
b = (”bob”, “mary”)
a + b

Question 23

What are mutable objects

Answer 23

Mutable objects can change after their creation

Question 24

Define mutability of list

Answer 24

a=[1,2,3,4]
a
b=a
a[2]=8
print(b)
print(a)

Both A & B prints same value , becoz a & b points to same location , they are immutable

Question 25

What are alias of list

Answer 25

a=[1,2,3,4]
a
b=a
A and B alias to same memory location

Question 26

What are the mutable objects in Python

Answer 26

Lists, dictionaries, sets

Question 27

What is the basic Syntax of list comprehension ?

Answer 27

myList = [expression for member in iterable ]

Question 28

What is iterable in Python

Answer 28

An object returning its members one at a time using loop.
An iterable is any Python object capable of returning its members one at a time, permitting it to be iterated over in a for-loop

Question 29

What is boilerplate code ?

Answer 29

Boilerplate code, also known as boilerplate, is the part of code that has to be repeatedly in use with no or a little modification .
Simply , the same code used multiple times .

Question 30

How to square a number in Python , write a program 2 square air first thousand numbers using list comprehension method ?

Answer 30

mylist =[i**2 for i in range(1000)]
print(mylist)

Question 31

Write a program to print all even number within range, using list comprehension method ?

Answer 31

def even_no(num):
if num % 2 ==0:
return num
else:
return 0
mylist=[even_no(i) for i in range(100)]
print(mylist)

Question 32

What is the output of this expression,
4/2

Answer 32

The output is 2.0

Question 33

What is the output of this expression,
abs(-4/2)

Answer 33

2.0

Question 34

What is the output of this expression,
int(abs(-4/2))

Answer 34

2

Question 35

Write a program to create dictionary using list comprehension ?

Answer 35

my_dict = {i:i**2 for i in range(6)}
print(my_dict)
{0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25}

Question 36

Write a program to create set using list comprehension ?

Answer 36

my_set = {i**2 for i in range(6)}
print(my_set)
{0, 1, 4, 9, 16, 25} Jack is it if we want now have a generous over but it works but it does not

Question 37

Write a program to create tuple using list comprehension ?

Answer 37

my_tuple = tuple(i**2 for i in range(6))
print(my_tuple)
(0, 1, 4, 9, 16, 25)

Question 38

Write a program to print give a number between one to hundred using comprehension method only and without function ?

Answer 38

my_list = [“Even No. Found” for i in range(100) if i%2==0]
print(my_list,len(my_list))

Question 39

How to use “if else statement” in list comprehension method, write a program to create a list of even numbers between 1 to 100 ?

Answer 39

mylist=[i if i%2==0 else 100 for i in range(10)]
print(mylist)
[0, 100, 2, 100, 4, 100, 6, 100, 8, 100]

Question 40

Write Program to create a matrix by using nested list comprehension ?

Answer 40

matrix = [[i for i in range(5)] for _ in range(6) ]
matrix
[[0, 1, 2, 3, 4],
[0, 1, 2, 3, 4],
[0, 1, 2, 3, 4],
[0, 1, 2, 3, 4],
[0, 1, 2, 3, 4],
[0, 1, 2, 3, 4]]

Question 41

What is throwaway variable in nested comprehension

Answer 41

matrix = [[i for i in range(5)] for _ in range(6) ]
Dash is throw away variable in nested comprehension

Question 42

What is the Basic Syntax of list comprehension ?

Answer 42

newList = [expression for member in iterable]

Question 43

Which container object is immutable in python ?

Answer 43

tuple , you cat change value in tuple after creation.

Question 44

How to Change Tuple Values ?

Answer 44

Once a tuple is created, you cannot change its values. Tuples are unchangeable, or immutable as it also is called.
But there is a workaround. You can convert the tuple into a list, change the list, and convert the list back into a tuple.

Example
x = (“apple”, “banana”, “cherry”)
y = list(x)
y[1] = “kiwi”
x = tuple(y)

print(x)