Differentiate the list and dictionary data types of python by their characteristics along with example in brief.

Code:3150713 Date:07/09/2021

Subject Name:Python for Data Science

In Python, both lists and dictionaries are used to store and manipulate data, but they have different characteristics and use cases.

Lists:
Lists are ordered collections of items enclosed in square brackets [ ].
Lists allow duplicate values and maintain the order of elements.
Elements in a list can be accessed using index values, starting from 0.
Lists are mutable, which means their elements can be modified.
Lists are commonly used for storing and manipulating sequences of values or items.
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Example:

pythonCopy code# Creating a list of numbers
numbers = [1, 2, 3, 4, 5]

# Accessing elements in a list using index
print(numbers[0]) # Output: 1

# Modifying an element in a list
numbers[1] = 10

# Appending an element to the end of a list
numbers.append(6)

# Removing an element from a list
numbers.remove(3)

# Checking the length of a list
print(len(numbers)) # Output: 5

# Iterating through a list
for num in numbers:
print(num)
Dictionaries:
Dictionaries are unordered collections of key-value pairs enclosed in curly braces { }.
Each key in a dictionary must be unique.
Values in a dictionary can be accessed using their corresponding keys.
Dictionaries are mutable, which means their values can be modified.
Dictionaries are commonly used for storing and retrieving data in a structured manner where values are associated with unique keys.
Example:

pythonCopy code# Creating a dictionary of student data
student = {
"name": "John",
"age": 20,
"gender": "male",
"major": "Computer Science"
}

# Accessing values in a dictionary using keys
print(student["name"]) # Output: John

# Modifying a value in a dictionary
student["age"] = 21

# Adding a new key-value pair to a dictionary
student["city"] = "New York"

# Removing a key-value pair from a dictionary
del student["gender"]

# Checking the length of a dictionary
print(len(student)) # Output: 3

# Iterating through a dictionary
for key, value in student.items():
print(key, ":", value)
In summary, lists are ordered collections of items, allow duplicate values, and are commonly used for sequences of values. On the other hand, dictionaries are unordered collections of key-value pairs, have unique keys, and are commonly used for storing and retrieving data in a structured manner. Both lists and dictionaries are mutable and can be modified as needed in Python.

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