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(c) remove( )

del is used to delete known elements

^ is the symmetric difference operator

sort( ) function sorts the element in list.

Syntax:

List.sort (reverse = True/False, Key = myFunc) Both arguments are optional

• If reverse is set as True, list sorting is in descending order.
• Ascending is default.
• Key=myFunc; “myFunc” – the name of the user defined function that specifies the sorting criteria.

Example

My List=[‘Thilothamma’ , ’Tharani’ , ‘Anitha’ , ‘SaiSree’ ,

‘Lavanya’]

MyList.sort( )

print(MyList)

Output:

[‘Anitha’ , ‘Lavanya’ , ‘SaiSree’ , ‘Tharani’ , ‘Thilothamma’]

(b) Index to

A List is a sequence data type like strings.

Difference between List and Dictionary

1. List is an ordered set of elements. But, a dictionary is a data structure that is used for matching one element (Key) with another (Value). 

2. The index values can be used to access a particular element. But, in dictionary key represents index. Remember that, key may be a number of a string.

3. Lists are used to look up a value whereas a dictionary is used to take one value and look up another value.

num = [ ]

for x in range(1, 21):

num.append(x)

print(“The list of numbers from 1 to 20 = ” , num)

for index, i in enumerate(num):

if(i % 3 == 0)

del num[index]

print(“The list after deleting numbers” , num) 

Output:

The list of numbers from 1 to 20 = [1,2,3,4… 20] 

The list after deleting numbers[1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20]

A list or tuples can be converted as set by using set function

1. The elements of a list are changeable (mutable) whereas the elements of a tuple are unchangeable (immutable), this is the key difference between tuples and list.

2. The elements of a list are enclosed within square brackets. But, the elements of a tuple are enclosed by paranthesis.

3. Iterating tuples is faster than list.

+  is used to join two tuples.

There are 2 arguments in the sort( ) function

The term tuples in latin represents an abstraction of the sequence of numbers.

(a) The dictionary type stores a index along with its element

(c) step value

The tuple( ) function is used to create tuples from a list.

tuples consists of a number of values separated by comma and enclosed within parenthesis

The mixed collection of elements are called as dictionary

If is optional in dictionary comprehension

(d) Iterating list is faster than tuples.

The key value pairs are enclosed with { }

Syntax:

List.remove(element) # to delete a particular element 

List.pop(index of an element)

List, clear( )

(a) it will be appended

Syntax:

del List [index of an element]

# to delete a particular element del List [index from : index to]

# to delete multiple elements

del List

# to delete entire list

Syntax:

List_Variable [index of an element] = Value to be changed

List_Variable [index from : index to] = Values to changed

Where, index from is the beginning index of the range; index to is the upper limit of the range which is excluded in the range.

Answer is (d) include

(b) [0, 1, 4, 9, 16]

Let list1=[2 ,4, 6, 8, 10], then print (List1[-2]) will result in 8

= is the tuple assignment operator

While creating a tuple with a single element, add a comma at the end of the element. In the absence of a comma, Python will consider the element as an ordinary data type; not a tuple. Creating a Tuple with one element is called “Singleton” tuple.

MyTup5 = (10,)

[(40, 4000), (10, 1000), (20, 2000), (50, 5000), (30, 3000)] 

[40,10, 20, 50, 30] 

[4000,1000, 2000,5000,3000]

def arrange (1, n) 

for i in range (n – 1): 

for j in range (n – i – 1): 

if l[j] > l[j +1] : 

temp = l[j] 

l[j] = l[j+l] 

l[j+l] = temp

Answer:

list1[0]: physics

The method list() takes sequence types and converts them to lists. It is used toconvert a given tuple into list.

Syntax

Following is the syntax for list() method :

list (seq)

list2[1:5[: [2,3,4,5]

To remove a list element, you can use either the del statement or the remove]) method

To remove a list element, you can use either I the del statement if you know exactly which ‘ element(s) you are deleting or the remove I ( ) method if you do

not know. Following is a simple example:

# !/user/bin/python

list1 = [‘physics’, ‘chemistry’, 1997, 2000];

print list1;

del list1 [2];

print “After deleting value at index 2 :”

print list1;

When the above code is executed, it produces the following result:

[‘physics’, ‘chemistry’, 1997, 2000];

After deleting value at index 2;

[‘physics’, ‘chemistry’, 2000]

To remove a list element, you can use either I the del statement if you know exactly which ‘ element(s) you are deleting or the remove I ( ) method if you do not know. Following is a simple example:

# !/user/bin/python 

list1 = [‘physics’, ‘chemistry’, 1997, 2000]; 

print list1; 

del list1 [2]; 

print “After deleting value at index 2 :” 

print list1;

When the above code is executed, it produces the following result:

[‘physics’, ‘chemistry’, 1997, 2000]; 

After deleting value at index 2; 

[‘physics’, ‘chemistry’, 2000]

Answer:

list2[1:5[: [2,3,4,5]

It compares elements of both lists.