Python 3 Data Types
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Questions and Answers

What is the result of the expression 5 / 2 in Python 3?

  • Error, division by zero
  • 2.5 (correct)
  • 5
  • 2

    • What is the purpose of the modulus operator % in Python?

  • To perform division and return the quotient
  • To perform multiplication
  • To perform exponentiation
  • To perform division and return the remainder (correct)

    • What is the data type of the literal 3.14 in Python 3?

  • float (correct)
  • int
  • list
  • str

    • How can you concatenate two strings in Python 3?

    <p>Using the <code>+</code> operator</p> Signup and view all the answers

    What is the result of indexing a string with 0 in Python 3?

    <p>The first character of the string</p> Signup and view all the answers

    What is the purpose of square brackets [] in Python 3?

    <p>To define a list literal</p> Signup and view all the answers

    What is the data type of the literal 1 in Python 3?

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

    What is the result of the expression 'hello' + 'world' in Python 3?

    <p>The string 'helloworld'</p> Signup and view all the answers

    What is the purpose of the str data type in Python 3?

    <p>To represent sequences of characters</p> Signup and view all the answers

    What is the purpose of the list data type in Python 3?

    <p>To represent ordered collections of items</p> Signup and view all the answers

    Study Notes

    Integers

    • In Python 3, integers are whole numbers, either positive, negative, or zero.
    • They are defined using the int data type.
    • Examples: 1, -5, 0
    • Integers can be used in arithmetic operations:
      • Addition: a + b
      • Subtraction: a - b
      • Multiplication: a * b
      • Division: a / b (returns a float)
      • Modulus (remainder): a % b

    Floats

    • In Python 3, floats are decimal numbers, either positive, negative, or zero.
    • They are defined using the float data type.
    • Examples: 3.14, -0.5, 0.0
    • Floats can be used in arithmetic operations:
      • Addition: a + b
      • Subtraction: a - b
      • Multiplication: a * b
      • Division: a / b
      • Modulus (remainder): a % b
    • Floats can also be expressed in scientific notation: 1.23e-4

    Strings

    • In Python 3, strings are sequences of characters, such as letters, digits, or symbols.
    • They are defined using the str data type.
    • Strings can be enclosed in single quotes 'hello' or double quotes "hello".
    • Strings can be concatenated using the + operator: 'hello' + 'world'
    • Strings can be indexed and sliced:
      • Indexing: my_string[0] returns the first character
      • Slicing: my_string[1:4] returns a substring from index 1 to 4 (exclusive)

    Lists

    • In Python 3, lists are ordered collections of items, such as integers, floats, or strings.
    • They are defined using the list data type.
    • Lists are denoted by square brackets [] and elements are separated by commas.
    • Examples: [1, 2, 3], ['a', 'b', 'c'], [1, 'hello', 3.14]
    • Lists can be indexed and sliced:
      • Indexing: my_list[0] returns the first element
      • Slicing: my_list[1:3] returns a sublist from index 1 to 3 (exclusive)
    • Lists can be manipulated using methods:
      • append() adds an element to the end of the list
      • insert() inserts an element at a specified position
      • remove() removes the first occurrence of an element
      • sort() sorts the list in ascending order

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    Description

    Learn about the basic data types in Python 3, including integers, floats, strings, and lists. Understand how to define and use them in your code.

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