Python Variables and Data Types
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Questions and Answers

How do you declare a variable in Python?

  • C.int x = 10
  • B.x = 10
  • x = 10 (correct)
  • var x = 10

    • Which of the following creates a set in Python?

  • A.set = []
  • B.set = {}
  • C.set = set() (correct)
  • D.set =

    • What is the output of the following code: x = {1, 2, 3}; x.add(4); print(x)

  • Error
  • {1, 2, 3}
  • {1, 2, 3, 4} (correct)
  • {1, 4, 2, 3}

    • How do you declare a constant variable in Python?

    <p>D.X = 10</p> Signup and view all the answers

    What is the output of the following code: x = 10; y = 20; print(x == y)

    <p>False</p> Signup and view all the answers

    How do you convert a string to an integer in Python?

    <p>A.int('10')</p> Signup and view all the answers

    What is the correct syntax to create a variable in Python?

    <p>x = 5</p> Signup and view all the answers

    What is the output of the following code? x = 5; y = "5"; print(x + y)

    <p>TypeError</p> Signup and view all the answers

    How do you create a list in Python?

    <p>list = []</p> Signup and view all the answers

    What is the keyword used to define a function in Python?

    <p>def</p> Signup and view all the answers

    Which of the following is a mutable data type in Python?

    <p>list</p> Signup and view all the answers

    What is the output of the following code? x = (1, 2, 3); x = 10; print(x)

    <p>10</p> Signup and view all the answers

    Which of the following is an immutable data type in Python?

    <p>str</p> Signup and view all the answers

    Study Notes

    Variables and Data Types

    • In Python, a variable is created by assigning a value to a name using the assignment operator (=).
    • The correct syntax to create a variable in Python is x = 5.

    Data Types

    • Integer data type in Python: C. 42.
    • The output of type(3.14) is float.
    • A valid variable name in Python cannot start with a number, so A. 3dogs is not valid.
    • The output of print(type(x)) where x = "Hello" is str.
    • Mutable data type in Python: D. list.
    • The keyword used to define a function in Python is B. def.
    • The keyword used to create a class in Python is B. class.

    List

    • A list in Python is created using square brackets [].
    • The output of print(type(x) == int) where x = 5 is True.
    • An immutable data type in Python: C. str.
    • The output of print(x) where x = [1, 2, 3] and then x = 10 is 10.

    Dictionary

    • A dictionary in Python is created using curly brackets {}.
    • The output of print(x) where x = (1, 2, 3) and then x = 10 is 10.

    Boolean

    • A boolean data type in Python: C. True.

    Sets

    • A set in Python is created using the set() function.
    • The output of print(x) where x = {1, 2, 3} and then x.add(4) is {1, 2, 3, 4}.

    Tuples

    • A tuple in Python is created using parentheses ().
    • The output of print(x + y) where x = (1, 2, 3) and y = (4, 5, 6) is (1, 2, 3, 4, 5, 6).

    Constants

    • There is no specific way to declare a constant variable in Python, but by convention, constants are written in uppercase letters, such as X = 10.

    Operations

    • The output of print(x + y) where x = 5 and y = "5" is TypeError.
    • The output of print(x == y) where x = 10 and y = 20 is False.

    Conversions

    • The correct way to convert a string to an integer in Python is A. int("10").

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    Learn about the basics of variables and data types in Python, including syntax, integer data types, and more.

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