Python Basics Quiz

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Questions and Answers

What is the value of the constant math.pi?

  • 3.141592653589793 (correct)
  • 1.414213562373095
  • 2.718281828459045
  • 6.283185307179586

What error occurs when attempting to concatenate a string with an integer directly?

  • ValueError
  • AttributeError
  • TypeError (correct)
  • IndexError

Which of the following options correctly incorporates a space in the full name output?

  • Both B and C (correct)
  • fullname = firstname + lastname
  • fullname = firstname + ' ' + lastname
  • fullname = f'{firstname} {lastname}'

What does math.e represent?

<p>Both A and B (D)</p> Signup and view all the answers

How can you convert an integer to a string for concatenation?

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

What does the output of print(math.inf) return?

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

Which method is NOT mentioned for concatenating strings?

<p>Using join() method (D)</p> Signup and view all the answers

What is a key characteristic of strings in Python?

<p>Strings are immutable, meaning they cannot be changed after creation. (D)</p> Signup and view all the answers

What is a key advantage of Python for beginners?

<p>It is a cross-platform language. (B)</p> Signup and view all the answers

Which free and open source software is mentioned for note-taking?

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

What programming concepts are emphasized for beginners rather than the specific language?

<p>Conditionals, loops, functions, and classes (D)</p> Signup and view all the answers

Under which license is this work provided?

<p>Creative Commons Attribution-ShareAlike 4.0 (C)</p> Signup and view all the answers

Which operating system is mentioned as being used in the creation of the book?

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

Which programming languages are used in the 'Hello World' example provided?

<p>Java, JavaScript, and Python (A)</p> Signup and view all the answers

What is one reason Python may be considered the best language for beginners?

<p>It has a simple syntax that aids learning. (D)</p> Signup and view all the answers

Which of the following is NOT listed as a programming language in the content?

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

What will happen if a function is called without properly defining it first?

<p>The program will return an error message indicating the function is not defined. (D)</p> Signup and view all the answers

Why is it beneficial to use meaningful function names?

<p>It makes the code more readable and maintainable for humans. (D)</p> Signup and view all the answers

What will be printed when the function show_countdown(3) is called?

<p>3 2 1 Boom! (D)</p> Signup and view all the answers

What is the output of y in the statement y = get_double(5)?

<p>10 (B)</p> Signup and view all the answers

What does the 'return' statement do within a function?

<p>It sends a value back to the part of the program where the function was called. (B)</p> Signup and view all the answers

How do you define a function in Python?

<p>Using the 'def' keyword followed by the function name and parameters. (A)</p> Signup and view all the answers

What do function parameters allow you to do?

<p>Specify values that can be passed to the function for processing. (D)</p> Signup and view all the answers

What is scope in programming?

<p>The area in which a variable is accessible within a program. (B)</p> Signup and view all the answers

What is the combined assignment operator for subtracting 4 from a variable x?

<p>x -= 4 (D)</p> Signup and view all the answers

Which function would you use to calculate the square root of 25 using the math module?

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

What does the math.degrees() function do?

<p>Converts radians to degrees (A)</p> Signup and view all the answers

What is the result of the operation y = math.pow(3, 2)?

<p>9 (B)</p> Signup and view all the answers

Which statement correctly describes how to use the math module in Python?

<p>You must import the module before using its functions. (D)</p> Signup and view all the answers

What does the combined assignment operator x *= 3 achieve?

<p>x = x * 3 (C)</p> Signup and view all the answers

How can you convert 90 degrees to radians using the math module?

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

To find the tangent of an angle, which function from the math module should be used?

<p>math.tan() (B)</p> Signup and view all the answers

What will happen if you attempt to change a value in a tuple?

<p>It will result in a TypeError. (C)</p> Signup and view all the answers

Which list comprehension correctly filters out scores under 20?

<p>final_scores = [score for score in scores if score &gt;= 20] (D)</p> Signup and view all the answers

What is the output of the code capitalized_words = [word.upper() for word in words] when words = ['Love', 'Me', 'Do']?

<p>['LOVE', 'ME', 'DO'] (D)</p> Signup and view all the answers

Which of the following statements accurately describes list comprehensions?

<p>They are a compact way to iterate and apply conditions to lists. (B)</p> Signup and view all the answers

Given weekdays = ('Mon', 'Tue', 'Wed', 'Thur', 'Fri'), what type of error occurs when trying to assign a new value directly to an element in the tuple?

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

What is the purpose of the if score >= 20 condition in the list comprehension for filtering scores?

<p>It excludes any scores below 20. (C)</p> Signup and view all the answers

What is the output of print(weekdays) when weekdays = ('Mon', 'Tue', 'Wed', 'Thur', 'Fri')?

<p>('Mon', 'Tue', 'Wed', 'Thur', 'Fri') (C)</p> Signup and view all the answers

Which operation can you perform on a tuple?

<p>Create a new tuple with the same name. (B)</p> Signup and view all the answers

What does the super() function do in the context of the Student class?

<p>It allows the Student class to inherit methods and attributes from the Person class. (D)</p> Signup and view all the answers

What happens when sue.speak() is called in the Student class?

<p>It prints a message indicating Sue's name and grade. (C)</p> Signup and view all the answers

In the constructor of the Student class, what is the purpose of self.grade = 0?

<p>It initializes the grade attribute for the Student instance. (A)</p> Signup and view all the answers

What is a key feature of method overriding in the Student class?

<p>It allows the Student class to create unique behavior for the speak method. (C)</p> Signup and view all the answers

Which of the following correctly demonstrates creating an instance of the Student class?

<p>sue = Student() (C)</p> Signup and view all the answers

What would be the output of sue.speak() if 'sue' is a Student with sue.name = 'Sue' and sue.grade = 12?

<p>'Hi. My name is Sue and I am in grade 12.' (D)</p> Signup and view all the answers

What does the term 'class variables and methods' refer to?

<p>Attributes and methods shared across all instances of a class. (B)</p> Signup and view all the answers

Which statement about the Person class’s speak method is true?

<p>It can be overridden by the Student class. (B)</p> Signup and view all the answers

Flashcards

Combined Assignment Operators

Combined assignment operators combine an arithmetic operator with the assignment operator (=) to shorten the code.

Python Modules

A module is a collection of code that adds functionality to Python. They're not inherent to Python but enhance its capability.

The math module

The math module provides a variety of mathematical functions for use in Python.

math.pow(x, y)

The function math.pow(x, y) raises x to the power of y using the math module. Equivalent to x ** y .

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math.sqrt(x)

The function math.sqrt(x) finds the square root of x using the math module. Equivalent to x ** 0.5.

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Trigonometric Functions in Math Module

The math module provides trigonometric functions like sin, cos, and tan.

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math.degrees(x)

The function math.degrees(x) converts an angle from radians to degrees.

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math.radians(x)

The function math.radians(x) converts an angle from degrees to radians.

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String

A text data type in programming. It is a sequence of characters enclosed in quotation marks.

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Hello World Program

A program that prints the phrase "Hello World!" on the screen. It is a simple program often used as a basic introduction to a new programming language.

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Computer Code

Instructions that tell a computer what to do. Instructions are written and organized in a specific way that the computer understands.

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Programming Language Syntax

A set of rules that define the structure and syntax of a programming language.

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Code Editor

A software tool used for writing and editing code. It provides features like syntax highlighting, code completion, and debugging tools, making coding easier.

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Cross-Platform Compatibility

The ability of a program to run on different operating systems like Windows, macOS, and Linux.

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Creative Commons License

A type of license that allows users to freely use, modify, and distribute work with attribution to the original creator.

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Code Simplicity

The ability to be easily understood and worked with. Python is often praised for its simple and clear syntax, making it beginner-friendly.

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Math Constants

Special numerical values used in mathematical Python calculations. Examples: 3.141592653589793 (pi), 2.718281828459045 (Euler's number), infinity.

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String Concatenation

Combining strings using the + operator. Example: "Hello" + " World"

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TypeError

A TypeError occurs when Python attempts to combine incompatible data types, like combining an integer and a string without conversion.

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String Conversion

A string can be converted to a number. The str() function can change a number into a string. This allows combining strings and numbers. Example: str(4) converts the number 4 to the string "4".

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f-strings

A versatile string formatting method using f-strings (strings prefixed with 'f'). It allows embedding values within a string. Example: f"The answer is {42}".

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Print Function

A special method used for printing data to the console in Python. Example: print("Hello World!")

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Print

A simple way to display the information about a variable in Python, and it helps to understand the type of variable that are defined. Example: print(the_answer) or print(firstname).

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Function Name

A function's name identifies it within a program. It's chosen by the programmer for readability. The computer doesn't care what the name is, as long as it's unique and follows Python rules.

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Function Arguments

Values passed into a function when it's called. A function can receive data this way, making it flexible.

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Function's Purpose

A function's ability to use the data it receives. It can process the arguments and perform actions based on them.

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Returning Values

A function doesn't just run code; it can return a value back to the main program, allowing for a result to be used.

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Scope

The area within a program where a variable is accessible. Variables have specific 'scopes' where they can be used.

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Local Scope

Variables defined inside a function are only accessible within that function.

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Global Scope

Variables defined outside functions are accessible to all parts of the program.

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Global Variables

Variables declared outside of functions but within a class or module are called global variables.

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What is a tuple?

A tuple is a kind of sequence that holds multiple values of any data type, but they are immutable (meaning they can't be changed after they are created).

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What happens when you try to change an element in a tuple?

Attempting to directly assign a new value to an element in a tuple will result in a TypeError because tuples resist alteration.

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What is a list comprehension?

List comprehensions provide a concise way to create new lists based on existing ones, performing operations on each item. It's a shorthand for looping through a list.

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How do list comprehensions handle filtering?

List comprehensions allow for filtering list elements based on a condition, selecting items that meet a specific requirement.

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How do list comprehensions work with operations?

List comprehensions apply an operation (like a function) to each item in a list, transforming each element.

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What does the upper() method do in Python?

The upper() method in Python converts all characters in a string to uppercase.

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How can you use list comprehensions to capitalize words?

List comprehensions can be used to capitalize all words in a list by applying the upper() method to each word.

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What's the advantage of using list comprehensions?

List comprehensions offer a concise way to iterate and modify lists, often reducing the need for explicit loops. They are a powerful tool for working with lists in Python.

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Class

A class that acts like a template for creating objects. It defines the attributes and methods that objects of that class will have.

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Method

A function that is defined within a class. It acts on the object's data.

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Attribute

A variable that belongs to an object. It stores data about the object.

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Instantiation

The process of using a class to create an instance (object) of that class.

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Subclass

A class that inherits properties (attributes and methods) from another class. It extends the functionality of the parent class.

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Superclass

A class that is inherited from. It provides the basic attributes and methods for its subclasses.

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Overriding Method

A method in a subclass that overrides a method with the same name in its superclass. It provides specific behavior for the subclass.

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Class Variable and Method

A class variable belongs to the class itself and not to individual objects. All objects of that class share the same class variable. Methods are defined within the class and can access both class variables and instance variables.

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Study Notes

Introduction

  • TokyEdtech's Introduction to Python for Beginners
  • Course materials written by Christian Thompson (AKA TokyoEdtech)
  • Published in February 2024

Contents

  • Chapter 0: Introduction
    • Covers the purpose and scope of the book
    • Details how the book was created (using free and open source software)
    • Creative Commons licensed
  • Chapter 1: Welcome to Python
    • Introduction to the Python language
    • Hello World program examples in Java, JavaScript, and Python
    • Explanation of Python's suitability for beginners
    • How to download and install Python
    • Overview of IDLE, Geany, PyCharm, and Visual Studio Code as IDE options
  • Chapter 2: Printing with Variables
    • Introduction to variables and data types (integer, float, Boolean, string)
    • Understanding escape characters (e.g., newline, tab) for formatting
    • Print statements in Python 2.x and 3.x
    • Methods to use variables in print
  • Chapter 3: Using Variables - Math and Strings
    • Arithmetic operators (+, -, *, /, **, %) including combined operators
    • The math module (math.pow, math.sqrt) and using constants (math.pi, math.e)
    • String manipulation (concatenation, multiplication, methods like capitalize, lower, upper, len).
    • Slices
  • Chapter 4: Conditionals
    • Basic if statements
    • Comparison operators (>, <, = =, !=, >=, <=)
    • Combining conditions using and/or
    • Using elif and else for complex conditionals
    • Determining if a particular character is in a string
  • Chapter 5: Loops
    • For loops and while loops
    • Counting up, counting down, counting by twos
  • Chapter 6: Functions
    • Function definitions and calls
    • Passing values to functions
    • Returning values from functions
    • The scope of variables within functions and the global keyword if needed
    • Combining conditionals, loops, and functions using these concepts
  • Chapter 7: Lists and Tuples
    • Basic structure of lists and tuples
    • List indices and slicing
  • Chapter 8: Dictionaries
    • Using key-value pairs, accessing keys and values
    • Iterating through dictionaries
  • Chapter 9: Classes
    • Basic structure of classes
    • How to create methods and their use
  • Chapter 10: More About Classes
    • Class Variables
    • Modifying attributes (methods get, set)
  • Chapter 11: User Input
    • Understanding the input() function
    • Using the input() function with various data types
  • Chapter 12: Graphical User Interfaces with Tkinter
    • Introduction to GUI programming
    • Using Tkinter widgets (labels, entry boxes, buttons etc.)
  • Chapter 13: Turtle Module
    • Introduction to turtle graphics
  • Chapter 14: Miscellaneous Tips and Tricks
    • The OS module (clearing the screen, playing audio files)
    • Handling time using the time module
  • Chapter 15: Code Organization and Importing
    • Introduction to organizing code in different files
    • How to import functions using import and from statements (e.g., from .py to .py file )

Video Tutorials

  • Numerous video tutorials are also available for each chapter. Links to those are provided in the linked document.

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