WEBVTT

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Data structures, lists, tuples, and dictionaries.

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In this video, we will understand the differences between lists, tuples, and dictionaries.

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Use dictionaries for key value data storage.

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Apply data structures in a real-world program.

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This Python program is a simple student information system that allows users to add, view, and retrieve student details using a dictionary.

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Dictionaries.

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A dictionary is an unordered collection of key value pairs.

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Each key is unique, and it maps to a value.

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They are created using curly braces.

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Let's see how we can use it in a program.

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This dictionary stores student details using student ID as the key.

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Each student's information, name, age, and grade, is stored as another nested dictionary.

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The dictionary allows quick lookup of student information by their ID.

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Lists.

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A list is an ordered collection of items that can be added, removed, and rearranged.

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They are created using square brackets.

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Although it is not used in this program, lists could be used if we wanted to store students as a collection of values instead of using a dictionary.

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Here, each student is represented as a list of values.

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But retrieving a student by ID would be difficult, since lists do not have key value pairs.

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Tupples.

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Tupples is like an ordered collection of fixed records.

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It cannot be changed after creation.

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They are created using parentheses.

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For example, student tuple equal to 101, Alice 12, 6.

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This is a fixed record for a student.

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If we wanted to store multiple students as tuples inside a list, we could structure it like this.

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Each tuple representing a student's ID, name, age, and grade.

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Each student's details would remain unchanged.

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Tupples are useful when data should not change, but dictionaries are more efficient for lookup operations.

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How it works in a real-world program.

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Users interact with the program through four options.

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Add student.

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User adds student details.

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View all students.

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User views all students.

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Get student details by ID.

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User retrieves a specific student.

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Exit.

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Program keeps running until the user chooses to exit.

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Lists are flexible, tuples are fixed, and dictionaries enable fast lookups.

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This program used dictionaries for efficient student record management, showing the power of the right data structure.