Introduction to Python Programming
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Questions and Answers

What will be the output of the following code? x = 5; y = 10; print(x, y)

  • 5 10
  • 10, 5
  • Error due to syntax
  • 5, 10 (correct)

    • What data type does the input function return regardless of the input?

  • Float
  • String (correct)
  • Integer
  • None

    • What will the output be for the code print(2 + 3, 'is the result')?

  • 2, 3 is the result
  • 5 is the result (correct)
  • 2 + 3 is the result
  • Error due to incorrect syntax

    • Which statement is true about the use of commas in the print function?

    <p>It outputs the items with a space between them (A)</p> Signup and view all the answers

    What must be done to convert the input provided as a string into an integer for processing?

    <p>Wrap it with int() function (A)</p> Signup and view all the answers

    Which function would you use to prompt a user for their name and store it as a variable?

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

    If the user inputs '45' using the input function, what will the type of the variable storing this input be?

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

    What will the output be from this code snippet: first = int(input('Enter first number: ')); print(first) if the user enters '10'?

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

    What is the primary purpose of the print function in Python?

    <p>To evaluate expressions and display them in the console. (B)</p> Signup and view all the answers

    Which of the following is NOT considered a statement type in Python?

    <p>function definition (C)</p> Signup and view all the answers

    In Python, which character can be used to create a multi-line statement?

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

    What role does indentation play in Python programming?

    <p>It indicates a block of code to the interpreter. (C)</p> Signup and view all the answers

    Which statement is accurate regarding the use of a semicolon in Python?

    <p>It allows multiple statements to be written on a single line. (C)</p> Signup and view all the answers

    Which of the following does NOT apply to multi-line statement creation in Python?

    <p>Using braces to denote a block of code. (D)</p> Signup and view all the answers

    Which of the following statements about the statement 'x = 1 + 2 + 3 + \ 4 + 5' is true?

    <p>It uses the continuation character for multi-line statements. (D)</p> Signup and view all the answers

    What is a significant difference between indentation in Python and other programming languages such as C or Java?

    <p>Indentation in Python affects the execution of the code. (B)</p> Signup and view all the answers

    What distinguishes an algorithm from a computer program?

    <p>Algorithms consist of well-defined steps, while programs execute tasks. (B)</p> Signup and view all the answers

    Which of the following is not a feature of an algorithm?

    <p>Instructions can be ambiguous (B)</p> Signup and view all the answers

    In terms of algorithm features, what does it mean for an algorithm to be a 'blueprint'?

    <p>It serves as a guide for completing a specific task. (A)</p> Signup and view all the answers

    What is the first step in a typical algorithm for subtracting two numbers?

    <p>Align the digits of both numbers from right to left. (C)</p> Signup and view all the answers

    What is the role of a computing agent in the context of algorithms?

    <p>To interpret algorithms and perform the required manipulations. (C)</p> Signup and view all the answers

    Why is it beneficial for a computer to perform routine tasks instead of a human?

    <p>Computers can work faster and cheaper than humans. (D)</p> Signup and view all the answers

    What ultimately happens when an algorithm is executed?

    <p>It must reach a solution and then halt. (D)</p> Signup and view all the answers

    What is the correct order of actions taken by a computing agent when executing an algorithm?

    <p>Input, transformation, output. (C)</p> Signup and view all the answers

    What is the primary purpose of comments in Python code?

    <p>To aid user comprehension and readability (D)</p> Signup and view all the answers

    Which of the following is true about comments in programming languages?

    <p>They are ignored by the compiler (C)</p> Signup and view all the answers

    How can multi-line comments be created in Python?

    <p>Through the use of triple quotes (D)</p> Signup and view all the answers

    What character is used for single line comments in Python?

    <h1>(B)</h1> Signup and view all the answers

    What is a syntax error in programming?

    <p>An error due to typographical mistakes (D)</p> Signup and view all the answers

    Which example correctly illustrates the use of multi-line comments?

    <p>&quot;&quot;&quot;This comment spans multiple lines&quot;&quot;&quot; (A)</p> Signup and view all the answers

    Why should assumptions be included in comments?

    <p>To clarify how the application functions (D)</p> Signup and view all the answers

    What would be the output of the following code? #This comment does nothing print("Hello")

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

    What happens when you try to combine a string and an integer using the + operator?

    <p>It raises a TypeError. (D)</p> Signup and view all the answers

    Which of the following will output '5 John'?

    <p>print(5, 'John') (C)</p> Signup and view all the answers

    What is the purpose of the global keyword in Python?

    <p>To declare a variable as global inside a function. (C)</p> Signup and view all the answers

    Which of the following statements is true regarding unpacking values into variables?

    <p>Unpacking requires the same number of variables as elements in the iterable. (B)</p> Signup and view all the answers

    What will the following code output? x = 'Python '; y = 'is '; z = 'awesome'; print(x + y + z)

    <p>'Python is awesome' (C)</p> Signup and view all the answers

    Which of the following allows you to output multiple variables of different types without errors?

    <p>Separating them with commas in the print() function. (A)</p> Signup and view all the answers

    If x = 5 and y = 'John', what does print(x + y) output?

    <p>TypeError: unsupported operand type (D)</p> Signup and view all the answers

    What is the consequence of having a variable declared globally and then modified inside a function without the global keyword?

    <p>A new local variable with the same name will be created. (D)</p> Signup and view all the answers

    Which of the following is a valid variable name in Python?

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

    What will be the output of the following code: 'x, y = 5, 10; print(x + y)'?

    <p>15 (D)</p> Signup and view all the answers

    Which of the following statements about variable names is true?

    <p>Variable names cannot begin with a digit. (C)</p> Signup and view all the answers

    When using camel case for variable naming, how should the words be formatted?

    <p>Each word except the first starts with an uppercase letter. (A)</p> Signup and view all the answers

    What will happen if you attempt to print a variable named 'my_var2' that has not been defined?

    <p>It will cause a NameError. (C)</p> Signup and view all the answers

    Which of the following variable declarations is incorrect?

    <p>myVar! = 20 (B)</p> Signup and view all the answers

    What is the output of the following code: my_var = 'Hello'; print(myVar) if myVar has not been defined?

    <p>Error due to undefined variable (D)</p> Signup and view all the answers

    Which naming convention separates words with underscores?

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

    In Python, which of the following is NOT a case-sensitive variable name?

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

    Which of the following correctly depicts a variable assignment of multiple values?

    <p>x = y = z = 'Banana' (A), x, y = 'Apple', 'Orange' (C)</p> Signup and view all the answers

    Given the variable names var, _var, Var, and 2var, which two are valid?

    <p>var and Var (B), var and _var (C)</p> Signup and view all the answers

    Which of the following statements about variable naming conventions in Python is incorrect?

    <p>Variable names may contain spaces. (D)</p> Signup and view all the answers

    When assigning multiple variables in one line, what is necessary for the code to work?

    <p>Commas must separate the variable names and values. (C)</p> Signup and view all the answers

    Which of the following variable names demonstrates illegal naming due to Python rules?

    <p>my-var-name (B)</p> Signup and view all the answers

    What will happen if you define a variable with the name of a Python keyword?

    <p>An error will occur. (C)</p> Signup and view all the answers

    Flashcards

    Algorithm

    A set of steps to accomplish a task.

    Algorithm Features

    Finite instructions, well-defined actions, halting, general problem-solving.

    Computer Program

    An algorithm represented for execution by a computer.

    Variable Assignment

    Giving a name to data for storage and use in a program.

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    Input

    The data a computer program receives before processing.

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    Output

    The results produced by a program after processing input.

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    Computing Agent

    The entity performing the steps of an algorithm (e.g., a person or a computer).

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    Python Programming

    A way of giving instructions to a computer so it can perform tasks by writing code in the Python language.

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    print() function

    Displays output to the console in Python.

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    input() function

    Gets input from the user as a string.

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    print() function (multiple arguments)

    Displays multiple values separated by spaces.

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    input() function (string conversion)

    Converts user input to strings, input function always returns a string.

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    input(prompt)

    Takes input from user with a specific message.

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    data type conversion

    Converting a data type from one form to another.

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    Python Statement

    In Python, a statement is a line of code that the interpreter executes. It tells the computer what to do.

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    Multi-line Statement

    A Python statement that spans multiple lines. It's often used for longer calculations or complex tasks.

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    Continuation Character

    The backslash () character in Python, used to extend a statement across multiple lines.

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    Indentation in Python

    Spaces at the beginning of a line that tell Python which statements belong together in a block.

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    Code Block

    A group of statements in Python that are related and grouped together.

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    Python Interpreter

    The part of Python that reads and executes your code.

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    Semicolon (;) in Python

    Allows multiple statements on one line. Used for multiple actions on a single run.

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    Importance of Indentation

    Indentation controls the flow of execution in Python, identifying blocks of code.

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    Python Comments

    Notes within code that are ignored by the Python interpreter.

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    Single-line comment

    A comment that spans one line, beginning with the '#' symbol.

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    Multi-line comment (using #)

    A comment that spans multiple lines using the '#' symbol for each line.

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    Multi-line comment (using """ """)

    A comment that spans multiple lines using triple quotes """ """.

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    Syntax Error

    An error in a program's code caused by a violation of the rules (syntax) of the programming language.

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    Code Readability

    How easy a program's code is to understand and follow.

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    Code Execution Prevention

    Comments can temporarily disable part of code during testing or development.

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    Assumptions/Explanation in code

    Comments used to explain assumptions and how the application works for the user.

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    Unpacking

    Assigning multiple values from an iterable (like a list) to multiple variables in a single line.

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    Output Variables

    Displaying the values of variables using the print() function.

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    Combining Outputs

    Joining values from multiple variables into a single output using the + operator.

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    String and Number Error

    Error caused by trying to add a string to a number directly with +.

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    Multiple Outputs with Commas

    Output multiple variables using commas in the print() function.

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    Global Variable

    A variable declared outside of any function, accessible from anywhere in the program.

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    Local Variable

    A variable declared inside a function, only accessible within that function.

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    Global Keyword

    Used inside a function to declare a variable as global, making it accessible and modifiable within that function.

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    Variable Name Rules

    Rules for defining variables in Python, including starting with a letter or underscore, not a number, using only alphanumeric characters and underscores, being case-sensitive, and avoiding keywords.

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    Valid Variable Name

    A variable name that follows the rules for Python variable naming.

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    Invalid Variable Name

    A variable name that violates the rules for Python variable naming.

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    Camel Case

    A naming convention where the first letter of each word, except the first, is capitalized. Example: myVariableName.

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    Pascal Case

    A naming convention where the first letter of every word is capitalized. Example: MyVariableName.

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    Snake Case

    A naming convention where words are separated by underscores. Example: my_variable_name.

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    Assign Multiple Variables

    Assigning values to multiple variables in one line, separating them with commas. Example: x, y, z = 'Orange', 'Banana', 'Cherry'.

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    Assigning Same Value

    Assigning the same value to multiple variables using the '=' operator repeatedly. Example: x = y = z = 'Orange'.

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    Unpack a Collection

    Assigning values from a list, tuple or other collection to separate variables. Example: x, y, z = [1, 2, 3] will assign 1 to x, 2 to y, and 3 to z.

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    Data Types

    Categories of data that can be stored in variables. Common ones include: Numbers, Text, Boolean Values.

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    Study Notes

    Introduction to Python Programming

    • Lecture 1 covers introductory Python programming concepts.
    • Chapter objectives include describing algorithm features, understanding computer programs, variables, and assignment in Python, and coding/running simple Python programs.
    • Algorithms are sets of steps to complete a task, forming the building blocks of programming and enabling decision-making in computers.
    • A concrete example is a method for subtracting two numbers, involving column-aligned digits, proceeding through columns from right to left, and borrowing.
    • Algorithms generally consist of a finite number of instructions, where each instruction is clearly defined.
    • These actions are performed by a computing agent, eventually leading to a problem solution.
    • Algorithms serve as blueprints for completing tasks.

    Computer Programming

    • This involves a computing agent (often a computer) following an algorithm's instructions, manipulating information, starting with input, transforming it according to rules, and generating output.
    • Algorithms and computer programs are interchangeable concepts in the processing of information.
    • Programming is essentially instructing a computer, as computers are not inherently intelligent and require explicit instructions.
    • A programming language is used to communicate with computers and write programs.

    Python Programming Language

    • Python is a high-level general-purpose programming language.
    • Python syntax is similar to English, enhancing readability and ease of learning.
    • Python provides programmers with useful tools like libraries and built-in functions, simplifying development.
    • Python has efficient high-level data structures and a simple yet effective object-oriented programming style.
    • Python is a free, open-source language; source code is freely readable, modifiable, and distributable.
    • Python works as an interpreter, reading one line at a time instead of compiling and then executing.
    • Python is beginner-friendly, widely used in machine learning, and possesses mature libraries for various applications like web development, machine learning, data analysis, etc.

    Installing Python

    • Many computers and Macs already have Python pre-installed.
    • To check if Python is installed, use the command prompt (or equivalent) and type "Python."
    • Alternative installers include downloading official distributions, using package managers (e.g., Anaconda), or installing specialized versions for numerical computation, Internet of Things (IoT) purposes, or embedded systems.
    • The current latest version is frequently updated, so check the Python website to ensure you have the current installer.

    Installing Python Using Anaconda Navigator

    • For a desktop GUI, Anaconda Navigator can simplify tasks in launching programs, managing packages, and controlling environments, without the need for command lines.
    • After downloading from the website, you need to follow simple steps to install the program in your system.

    Jupyter Notebook

    • Python code can be compiled and run using Jupyter.
    • Open Jupyter notebook, creating a new notebook, inputting code for desired tasks, saving data as ".ipynb" files.
    • Running code involves using Jupyter's built-in functionalities (e.g. Run, arrow button).

    Python Keywords

    • Each programming language uses specific keywords (reserved words) with precise meanings.
    • Python keywords, which cannot be used in other contexts, comprise 35 different words for use in programming.
    • These keywords are different from built-in functions and data types within Python itself.

    Python Statements

    • Statements are explicit commands to execute by the Python interpreter.
    • A statement like y=10 sends the value of 10 to the variable y.
    • Python statements, such as if, while, etc. come in a variety of forms, each having a specific purpose in Python programming.
    • Continuation characters (/) enable extending statements across multiple lines.
    • Brackets ((), {}, []) can be used to define multi-line statements, simplifying complex programming tasks.

    Indentation

    • Indentation is crucial to Python programming.
    • Whitespace at the beginning of a line dictates the block-structuring of code.
    • Using consistent whitespace and indentation is required as tab or space combined are not allowed, causing Python to misunderstand the coding structure.
    • Correct indentation is essential for unambiguous code interpretation.

    Output Variables

    • Python's print() function serves to display the results of expressions or statements directly to the console/terminal.
    • Python's print command can also show multiple variables separated by commas, providing flexibility in outputting multiple values in one command.
    • The + character can also be used to join strings and other values for display via the print() function.
    • Combining strings and numbers in the print() function using the + operator can result in errors; instead, use commas for separating different data types.
    • The combination must be valid within Python programming syntax to avoid errors.

    Global Variables

    • Variables declared outside functions are considered global, accessible anywhere inside or outside of the function.
    • Variables defined within a function are local, used only inside that function.
    • The global keyword makes a variable local, accessible within the function where defined.

    Variable Names

    • Variable names in Python can be short (e.g., x) or descriptive (e.g., student_name).
    • Variable names begin with a letter (A-Z, a-z) or an underscore (_).
    • Python variables must contain only alpha-numeric characters or underscores (A-Z, a-z, 0-9, and _).
    • Python keywords (e.g., if, while) cannot be used as variable names.
    • Variable names are case-sensitive (e.g., name, Name, NAME represent different variables).

    Comments in Python

    • Comments in Python explain sections of the code (e.g., for documentation).
    • Comments are added using the # symbol, enabling programmers to include notes for clarity, understanding, and reference.
    • Comments are ignored at runtime but essential for readability and maintainability, especially for large-scale programs or for others reviewing your Python code.

    Error Detection

    • Programmers frequently make typographical errors or mistakes in syntax during programming (called syntax errors), which lead to program execution errors.
    • Understanding syntax, the structure of statements in a programming language, is crucial for correctness.
    • Errors are displayed as SyntaxError or NameError, helping programmers locate and correct issues in their code.

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    Related Documents

    Lecture 1: Introduction to Python Programming PDF

    Description

    This quiz covers the fundamentals of Python programming as introduced in Lecture 1. You'll explore key concepts such as algorithms, variables, and the process of coding simple programs. Understanding these foundational elements is essential for successful programming in Python.

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