Page 449 - ComputerScience_Class_11

Output

Original value of x: 100
New value of x: 200

Characteristics of Immutable data types in Python
There are some characteristics of immutable data types in Python:
• Unchangeable: Once created, their values cannot be changed.
• Modification Creates New Object: Any change results in a new object being created.
• Examples: int, float, str, tuple, bool, none.

• Indexing and Slicing: Ordered immutable types like strings or tuples allow access but not modification.
• Memory Efficient: Immutable objects are generally safer and use memory efficiently.

Let’s Revisit

♦ A data type is a category that defines the kind of value a variable can store and the operations that can be performed on it.
♦ A floating (float) is a numeric data type used to store numbers that contain a decimal point or fractional part.
♦ A Boolean (bool) is a logical data type that holds only two possible values, True and False.
♦ A string is a sequence data type in Python that stores a group of characters enclosed in single (' ') or double (" ") quotes.
♦ Sequence data types in Python are collections of items that are stored in a particular order.
♦ A set is a collection of unordered, unique and mutable elements in Python.

MIND DRILL

Solved Questions

A. Tick ( ) the correct option.
1. Select the data type used in Python to store whole numbers without a decimal part.
a. Integer b. Float
c. Complex d. Boolean
2. Which sequence data type is enclosed in single or double quotes?
a. List b. Tuple
c. String d. Dictionary
3. Mark the following is a correct example of a basic list?
a. [1, 2, 3, 4] b. {1, 2, 3, 4}
c. (1, 2, 3, 4) d. 1, 2, 3, 4
4. Choose the Python data type(s) that do not allow storing duplicate values.
a. List b. Tuple
c. Set d. Dictionary key
5. Which symbol is used to define a dictionary in Python?
a. [] b. {}
c. <> d. ()

Answers
1. a 2. c 3. a 4. c 5. b

Data Types in Python 447