Understanding Python Lists

1. 1) What are Lists in Python how it is used?
   A list is a collection of similar or different types of data.
   For example,
   Suppose we need to record the age of 5 students. Instead of creating 5 separate variables, we can simply create a list:
   17,18,15,19,14
   List of Age
   Elements of a list

   A list is created in Python by placing items inside [], separated by commas . For example,
   # A list with 3 integers
   numbers = [1, 2, 5]
   print(numbers)
   # Output: [1, 2, 5]

   2) Explain the insert method with an example?
   Python insert() method inserts the element at the specified index in the list.
   Example:
   cities = [‘Mumbai’, ‘London’, ‘Paris’, ‘New York’]
   cities.insert(0, ‘New Delhi’) # inserts at 0 index (first element)
   print(cities)

   cities.insert(2, ‘Chicago’) # inserts at 2nd index
   print(cities)

   Output
   [‘New Delhi’, ‘Mumbai’, ‘London’, ‘Paris’, ‘New York’]
   [‘New Delhi’, ‘Mumbai’, ‘Chicago’, ‘London’, ‘Paris’, ‘New York’]

   Reply

2. 1.What are Lists in Python how it is used?
   -The list is an inbuilt data structure in Python used to store and use data items collectively and efficiently. Formally, a list can be defined as a group of data items referenced under a common name. Lists have the extra benefit of being dynamic in size, which means that, you don’t have to specify the size of lists beforehand, size is determined by the elements created in the list. Lists show benefits like, it can hold data items with different data types
   example: # Creating a List of numbers
   List = [10, 20, 14]print(“\nList of numbers: “)
   print(List)

   output : List of numbers:
   [10, 20, 14]

   2.Explain the insert method with an example?
   -For the addition of elements at the required position, the insert() method is used.The insert() method requires two arguments(position,value).
   For example: Python program to demonstrate
   # Addition of elements in a List
   # Creating a List
   List = [1,2,3,4]print(“Initial List: “)
   print(List)
   # Addition of Element at specific Position
   # (By using Insert Method)
   List.insert(3, 12)
   List.insert(0, ‘people’)
   print(“\nList whereafter performing Insert Operation: “)
   print(List)
   Output:

   Initial List:

   [1, 2, 3, 4]
   List whereafter performing Insert Operation:
   [‘people’, 1, 2, 3, 12, 4]

   Reply

3. The lists in python can be built by just placing sequencing the square brackets[]. Lists have mutable elements. Consider the example

   Python program to demonstrate
   # Creating a ListList = []print(“Blank List: “)
   print(List)
   # Creating a List of numbers
   List = [10, 20, 14]print(“\nList of numbers: “)
   print(List)
   # Creating a List of strings and accessing
   # using index
   List = [“Hello”, “For”, “people”]print(“\nList Items: “)
   print(List[0])print(List[2])
   # Creating a Multi-Dimensional List
   # (By Nesting a list inside a List)
   List = [[‘Hello’, ‘For’], [‘people’]]print(“\nMulti-Dimensional List: “)
   print(List)
   Output:

   All IT Courses 50% Off
   Blank List:

   []
   List of numbers:

   [10, 20, 14]
   List Items

   Hello

   people

   Multi-Dimensional List:

   [[‘Hello’, ‘For’], [‘people’]]
   Adding the elements to the list

   By using the append() method

   The elements that may be added to the list using the built-in append() function. Only one element that time added to the list by using the append method for any addition of multiple elements with append() method, loops will be used, Tuples that can also be included to the list with the use of the append method because the tuples are immutable. Lists that can be added to the existing list with the use of the append() method.

   By using the insert() method

   The append () method does the addition of elements at the last end of the list, for the addition of elements at the required position, the insert() method is used. Append() which takes only one argument, the insert() method requires two arguments(position,value). For example

   Python program to demonstrate
   # Addition of elements in a List
   # Creating a List
   List = [1,2,3,4]print(“Initial List: “)
   print(List)
   # Addition of Element at specific Position
   # (By using Insert Method)
   List.insert(3, 12)
   List.insert(0, ‘people’)
   print(“\nList whereafter performing Insert Operation: “)
   print(List)
   Output:

   Initial List:

   [1, 2, 3, 4]
   List whereafter performing Insert Operation:

   [‘people’, 1, 2, 3, 12, 4]
   Using the extend () method

   Apart from append() and insert() method there’s one more method we have for the addition of elements, extend(), this method will be used to add the multiple elements at the end.

   For example
   Python program to demonstrate
   # Addition of elements in a List
   # Creating a List
   List = [1, 2, 3, 4]print(“Initial List: “)
   print(List)
   # Addition of multiple elements
   # to the List at the end
   # (using Extend Method)
   List.extend([8, ‘people’, ‘Always’])
   print(“\nList whereafter performing Extend Operation: “)
   print(List)

   Reply

4. Understanding Python lists:

   What are Lists in Python and how is it used?

   One of the most powerful tools in Python is Lists. A single list may consist of data types like integers, strings, and objects. Lists are mutable and can be altered even after their creation.

   Creating a list:
   The lists in python can be built by just placing the sequence in the square brackets[].

   For our understanding: consider list as follows
   List = [1, 2, 3, 4, 5]
   List[0] = 1
   list[1] = 2
   list[2] = 3
   list[3] = 4
   list[4] = 5
   List[0:] = 1, 2, 3, 4, 5
   List[:] = 1, 2, 3, 4, 5
   List[1:4] = 2, 5
   List[0:3] = 1, 4

   # Creating a List of numbers
   List = [23,45,78]print(“\nList of numbers: “)
   print(List)

   Result = 23, 45, 78

   Explain the insert method with an example?

   To add the addition of elements at the required position, we use the ‘insert()’ method which has two arguments namely position and value whereas the append () method does adding the elements only at the last end of the list.
   # Addition of elements in a List:

   # Creating a List
   List = [A,B,D,E]print(“Initial List: “)
   print(List)

   # Addition of Element at specific Position (By using Insert Method)
   List.insert(3, C)
   List.insert(0, ‘Alphabet=’)
   print(“\nList whereafter performing Insert Operation: “)
   print(List)

   # Output:
   Initial list : [A,B,D,E]
   List after insert :[‘Alphabet=’, A,B,C,D]

   Reply

5. A.Lists are considered as dynamically sized arrays that will be used which are utilized in another language. Lists don’t need to be homogeneous always, which makes it the most powerful tool in python. A single list consists of data types like integers, strings, and objects. Lists are mutable and can be altered even after their creation.

   Lists in python will be ordered and have a definite count. The elements in a list are indexed as per definite sequence and indexing of a list is done with 0 being the first index. Each element in the list has its definite place in the list where it is allowed to duplicate elements in a list with each element which is having its own distinct place and also credibility.
   B.By using the insert() method

   The append () method does the addition of elements at the last end of the list, for the addition of elements at the required position, the insert() method is used. Append() which takes only one argument, the insert() method requires two arguments(position,value). For example
   Python program to demonstrate
   # Addition of elements in a List  
   # Creating a List
   List = [1,2,3,4]print(“Initial List: “)
   print(List) 
   # Addition of Element at specific Position
   # (By using Insert Method)
   List.insert(3, 12)
   List.insert(0, ‘people’)
   print(“\nList whereafter performing Insert Operation: “)
   print(List)

   Output: 

   Initial List: 
   [1, 2, 3, 4]

   List whereafter performing Insert Operation: 
   [‘people’, 1, 2, 3, 12, 4]

   Using the extend () method

   Reply

6. Lists in Python how it is used ?
   Lists are considered as dynamically sized arrays that will be used which are utilized in another language. Lists don’t need to be homogeneous always, which makes it the most powerful tool in python. A single list consists of data types like integers, strings, and objects. Lists are mutable and can be altered even after their creation.

   Lists in python will be ordered and have a definite count. The elements in a list are indexed as per definite sequence and indexing of a list is done with 0 being the first index. Each element in the list has its definite place in the list where it is allowed to duplicate elements in a list with each element which is having its own distinct place and also credibility.

   Reply

7. 1. What are Lists in Python how it is used?

   Lists in python will be ordered and have a definite count. The elements in a list are indexed as per definite sequence and indexing of a list is done with 0 being the first index. Each element in the list has its definite place in the list where it is allowed to duplicate elements in a list with each element which is having its own distinct place and also credibility. The lists in python can be built by just placing sequencing the square brackets[]. Lists have mutable elements.
   2. Explain the insert method with an example?
   For the addition of elements at the required position, the insert() method is used. Append() which takes only one argument, the insert() method requires two arguments(position,value). For example
   Python program to demonstrate
   # Addition of elements in a List
   # Creating a List
   List = [1,2,3,4]print(“Initial List: “)
   print(List)
   # Addition of Element at specific Position
   # (By using Insert Method)
   List.insert(3, 12)
   List.insert(0, ‘people’)
   print(“\nList whereafter performing Insert Operation: “)
   print(List)

   Output:

   Initial List:

   [1, 2, 3, 4]
   List whereafter performing Insert Operation:

   [‘people’, 1, 2, 3, 12, 4]

   Reply

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