Python Data Types Overview
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Questions and Answers

Which of the following statements is true about Python's type system?

  • Python does not support data types and treats all variables as generic objects.
  • Python uses a type system similar to C++, requiring explicit type declarations.
  • Python is a dynamically typed language, allowing the interpreter to automatically assign types to variables. (correct)
  • Python is a statically typed language, so data types must be explicitly defined.

    • What is the purpose of Python's type() function?

  • To convert a variable to a specific data type.
  • To check if a variable exists in the program.
  • To return the data type of a variable. (correct)
  • To determine the memory address of a variable.

    • Which of these is NOT a standard numeric data type supported by Python?

  • int
  • long
  • float
  • char (correct)

    • Which Python data type is primarily used to store a sequence of characters, enclosed in quotes?

    <p>String (D)</p> Signup and view all the answers

    In Python, what operator is used to concatenate two strings?

    <ul> <li>(A)</li> </ul> Signup and view all the answers

    How can you access a specific range of elements within a Python list?

    <p>By using slice [:] operators. (D)</p> Signup and view all the answers

    What distinguishes a tuple from a list in Python?

    <p>Tuples are immutable and cannot be modified once created. (C)</p> Signup and view all the answers

    Which of these data types stores a collection of key-value pairs in Python?

    <p>Dictionary (B)</p> Signup and view all the answers

    What is the output of the following code:

    t = ('hi', 'python', 2)
print(t[1:])

    <p>('python', 2) (B)</p> Signup and view all the answers

    Which of the following statements is TRUE regarding tuples in Python?

    <p>Tuples support indexing and slicing like lists. (C)</p> Signup and view all the answers

    Given the following Python code snippet, what is the data type of the variable d?

    d = {1:'Jimmy', 2:'Alex', 3:'john', 4:'mike'}

    <p>Dictionary (A)</p> Signup and view all the answers

    Which statement best describes the purpose of keywords in Python?

    <p>Keywords are pre-defined identifiers that cannot be used as variable names. (D)</p> Signup and view all the answers

    What is the output of the following code?

    d = {1:'Jimmy', 2:'Alex', 3:'john', 4:'mike'}
print(d.keys())

    <p>[1, 2, 3, 4] (A)</p> Signup and view all the answers

    Study Notes

    Data Types

    • Variables in Python can hold different data types
    • Python is a dynamically typed language, not needing to define variable type during declaration
    • The interpreter automatically assigns data type
    • Python's type() function returns the type of a variable

    Example

    • a = 10, b = "Hi Python", c = 10.5
    • print(type(a)), print(type(b)), print(type(c))
    • Output: <class 'int'>, <class 'str'>, <class 'float'>

    Standard Data Types

    • Numbers
    • Strings
    • Lists
    • Tuples
    • Dictionaries

    Numbers

    • Store numeric values
    • Python creates number objects when assigned to a variable
    • Examples: a = 3, b = 5
    • Python supports four numeric types:
      • int (signed integers, e.g., 10, 2, 29)
      • long (large integers, e.g., 908090800L)
      • float (floating-point numbers, e.g., 1.9, 9.902, 15.2)
      • complex (complex numbers, e.g., 2.14j, 2.0 + 2.3j)

    Strings

    • Sequence of characters in quotation marks
    • Can use single, double, or triple quotes
    • The + operator concatenates strings
    • The * operator replicates strings

    Example (Strings)

    • str1 = "hello Mech"
    • str2 = " how are you"
    • print(str1[0:2]), print(str1[4]), print(str1*2), print(str1 + str2)
    • Output: he, l, hello Mechhello Mech, hello Mech how are you

    Lists

    • Similar to arrays in C
    • Can hold data of various types
    • Items are separated by commas, enclosed in square brackets
    • Can use slice operators [:] to access list data

    Example (Lists)

    • I = [1, "hi", "python", 2]
    • print(I[3:]), print(I[0:2]), print(I), print(I+I), print(I*3)
    • Example output: [2], [1, 'hi'], [1, 'hi', 'python', 2], [1, 'hi', 'python', 2, 1, 'hi', 'python', 2], [1, 'hi', 'python', 2, 1, 'hi', 'python', 2, 1, 'hi', 'python', 2]

    Tuples

    • Similar to lists, but immutable (cannot be changed after creation)
    • Items are enclosed in parentheses
    • Items are separated by commas

    Example (Tuples)

    • t = ("hi", "python", 2)
    • print(t[1:]), print(t[0:1]), print(t), print(t+t), print(t*3)
    • Example output: ('python', 2), ('hi',), ('hi', 'python', 2), ('hi', 'python', 2, 'hi', 'python', 2), ('hi', 'python', 2, 'hi', 'python', 2, 'hi', 'python', 2)

    Dictionaries

    • Ordered collection of key-value pairs
    • Keys are unique and hold primitive data types
    • Values can be any Python object

    Example (Dictionaries)

    • d = {1:'Jimmy', 2:'Alex', 3:'john', 4:'mike'}
    • print("1st name is "+d[1]), print("2nd name is "+d[4]), print(d), print(d.keys()), print(d.values())
    • Example output: 1st name is Jimmy, 2nd name is mike, {1: 'Jimmy', 2: 'Alex', 3: 'john', 4: 'mike'} [1,2,3,4], ['Jimmy', 'Alex', 'john', 'mike']

    Keywords

    • Reserved words in Python with specific meanings to the compiler/interpreter
    • Python 3.7 has 33 keywords
    • Python 3.8 has 35 keywords (including async and await)

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    Data Types - Python Presentation PDF

    Description

    This quiz covers the foundational concepts of data types in Python, including numbers, strings, lists, tuples, and dictionaries. It delves into Python's dynamic typing and provides examples to illustrate how variables can hold different data types. Test your knowledge of these essential elements of Python programming!

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