What is the difference between a list, tuple, and dictionary?

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In Python, list, tuple, and dictionary are built-in data structures used to store collections of data, but they differ in mutability, syntax, and use cases.

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🔹 List:

• Ordered, mutable (can be changed).

• Allows duplicate values.

• Defined using square brackets [].

python

my_list = [1, 2, 3, 4]
my_list[0] = 10  # Modifiable

✅ Use when you need an ordered, changeable collection of items.

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🔹 Tuple:

• Ordered, immutable (cannot be changed).

• Allows duplicates.

• Defined using parentheses ().

python

my_tuple = (1, 2, 3)
# my_tuple[0] = 10  # ❌ Error – tuples can't be modified

✅ Use when you want a fixed, unchangeable collection (like coordinates, constants).

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🔹 Dictionary:

• Unordered (in older versions), mutable.

• Stores key-value pairs.

• Defined using curly braces {}.

python
my_dict = {'name': 'Alice', 'age': 25}
my_dict['age'] = 26  # Modifiable by key

✅ Use when data is best represented as key-value pairs (e.g., user info, settings).

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🔍 Quick Comparison:

Feature	List	Tuple	Dictionary
Mutable	Yes	No	Yes
Ordered	Yes	Yes	No (until Python 3.7+)
Duplicates	Allowed	Allowed	Keys must be unique
Syntax	[]	()	{key: value}

Each is suited to different scenarios depending on data type and structure needs.

Read More:

What are Type I and Type II errors?

How do you handle missing values in Pandas?

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