Python Data Types and Conventions
36 Questions
3 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following is a valid integer in Python?

  • 3.14
  • 100 (correct)
  • [100]
  • '100'

    • What is the correct syntax to define a list in Python?

  • <1, 2, 3>
  • {1, 2, 3}
  • (1, 2, 3)
  • [1, 2, 3] (correct)

    • Which data type would best represent the value 'True' in Python?

  • Float
  • String
  • Integer
  • Boolean (correct)

    • Which of the following variable names is invalid in Python?

    <p>2ndValue</p> Signup and view all the answers

    What will the output of 'print(type(3.14))' be?

    <p>&lt;class 'float'&gt;</p> Signup and view all the answers

    Which data structure uses curly braces {} to define its contents?

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

    What type of data structure is created with ( )?

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

    Which statement about variable naming is false?

    <p>Variable names can contain special characters like @.</p> Signup and view all the answers

    Which function would you use to convert an integer to a string in Python?

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

    What will be the output of print(type(variable3)) where variable3 = 123.456?

    <p>&lt;class 'float'&gt;</p> Signup and view all the answers

    What is the purpose of using type conversions?

    <p>To convert data into a compatible format for operations</p> Signup and view all the answers

    If variable5 = '6000', what will be the output of print(type(int(variable5)))?

    <p>&lt;class 'int'&gt;</p> Signup and view all the answers

    Which of the following conversions would lead to data loss?

    <p>Converting 23.56 to an integer</p> Signup and view all the answers

    What will the command print(type(variable2)) return if variable2 = '123'?

    <p>&lt;class 'str'&gt;</p> Signup and view all the answers

    Which module is mentioned for performing data analysis in Python?

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

    What does the parameter 'ascending=False' do in the sort_values() function?

    <p>Sorts the selected column in descending order</p> Signup and view all the answers

    Which of the following methods is used to filter rows and select columns based on their integer positions?

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

    Which of the following statements about renaming columns is correct?

    <p>Columns can be renamed by replacing spaces with underscores.</p> Signup and view all the answers

    When using loc, what does the format loc[row, column] represent?

    <p>Filtering rows by label and selecting specific columns</p> Signup and view all the answers

    What does the code 'housing_df.shape' return?

    <p>The dimensions of the DataFrame</p> Signup and view all the answers

    What is the first step to launch Spyder from Anaconda Navigator?

    <p>Select the Spyder IDE from the list of applications</p> Signup and view all the answers

    How can a user run a Python program in Spyder?

    <p>Click the Run icon or press F11 on the keyboard</p> Signup and view all the answers

    What must be checked when installing Python to ensure it can be run from the command line?

    <p>Add Python 3.X to PATH</p> Signup and view all the answers

    What command can be used to check if Pip is installed?

    <p>$ pip --version</p> Signup and view all the answers

    What is the correct way to create a new Python file in Jupyter Notebook?

    <p>Click on New &gt; Python from the top right corner</p> Signup and view all the answers

    What happens when you type 'python' in the command prompt after installing Python?

    <p>It opens the Python interactive window</p> Signup and view all the answers

    What is the significance of checking Python's version using '$ python --version'?

    <p>It verifies the installation was successful</p> Signup and view all the answers

    How should you run your Python code in Jupyter Notebook?

    <p>Select the cell and click on the Run icon or press Shift + Enter</p> Signup and view all the answers

    What does the iloc method primarily allow you to access in a DataFrame?

    <p>Specific rows and columns by their integer positions</p> Signup and view all the answers

    When using the loc method with the syntax loc[a:b], what does it return?

    <p>Rows a to b, inclusive of both a and b</p> Signup and view all the answers

    What is the primary distinction between a List and a Tuple in Python?

    <p>Lists are mutable, while Tuples are immutable</p> Signup and view all the answers

    How is the mean of a column calculated in a DataFrame?

    <p>By summing all values in the column and dividing by the count of rows</p> Signup and view all the answers

    What does the describe method provide in a DataFrame?

    <p>Summary statistics for each column in the DataFrame</p> Signup and view all the answers

    When is a Tuple preferred over a List in Python?

    <p>When data stability and integrity are crucial</p> Signup and view all the answers

    Which statement about accessing the second column of a DataFrame using iloc is correct?

    <p>Use housing_df.iloc[:, 1:2]</p> Signup and view all the answers

    In a DataFrame, what does the syntax housing_df['TOTAL_VALUE'][0:10] do?

    <p>Returns the first ten rows of the TOTAL_VALUE column</p> Signup and view all the answers

    Study Notes

    Python Data Types

    • Strings: Text enclosed in quotation marks, e.g., "hello there"
    • Floats: Numbers with decimal points, e.g., 0.25
    • Integers: Whole numbers without decimal points, e.g., 100
    • Booleans: Represent truth values, either True or False, represented as 1/0 or F/T
    • Lists: Ordered collections of data enclosed in square brackets, e.g., [1, 2, 3, 4, 5]
    • Tuples: Immutable collections of data enclosed in parentheses, e.g., (1, 2, 3, 4, 5)
    • Dictionaries: Unordered collections of key-value pairs enclosed in curly braces, e.g., {"a": 1, "b": 2, "c": 3}

    Variable Naming Conventions

    • Can only contain alphanumeric characters and underscores (A-z, 0-9, and _)
    • Cannot start with a number
    • Case-sensitive (e.g., "var" is different from "Var" and "VAR")

    Type Conversion

    • Can convert data types using functions like:
      • float(): Converts integers to floats
      • int(): Converts floats to integers
      • str(): Converts integers or floats to strings

    Using Pandas for Data Analysis

    • Pandas is a Python library for data manipulation and analysis.
    • DataFrame is a key data structure in Pandas that represents tabular data (rows and columns).
    • The read_csv() function reads data from CSV files into a DataFrame.

    Data Structures in Python

    • Vector: A one-dimensional array containing data of the same type (numeric or text).
    • Matrix: A two-dimensional array with rows and columns, all elements of the same type.
    • Array: A three-dimensional array with rows, columns, and depth, all elements of the same type.
    • Data Frame: A tabular data structure with multiple columns and rows, allowing for different data types.
    • Lists: Versatile collections that can hold various data types, including vectors, arrays, data frames, and other lists.

    List vs. Tuple

    • Lists: Mutable, meaning their elements and size can be modified after creation.
    • Tuples: Immutable, meaning they are fixed and cannot be changed once created.
    • Use lists for dynamic data where updates are needed.
    • Use tuples for data where immutability and data integrity are essential.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Data Analytics-Week3- Python Overview.pdf

    Description

    This quiz covers the fundamental data types in Python, including strings, integers, floats, booleans, lists, tuples, and dictionaries. Additionally, it addresses variable naming conventions and type conversion methods. Test your understanding of these essential concepts in Python programming.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser