Introduction to Python Week 1
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Introduction to Python Week 1

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Questions and Answers

What method would you use to add an item to the end of a list?

  • append() (correct)
  • extend()
  • insert()
  • add()

    • Which of the following statements regarding negative indexing in lists is accurate?

  • Negative indexing starts from the end of the list, where -1 refers to the last item. (correct)
  • Negative indexes can only be used with strings, not lists.
  • Negative indexes are not permitted in Python lists.
  • Negative indexing starts from the last item, with -1 being the first item.

    • What happens when you invoke the clear() method on a list?

  • It creates a new empty list and deletes the original.
  • It empties the list but keeps the list itself. (correct)
  • It removes the first item from the list.
  • It removes all occurrences of duplicate items.

    • In Python, how would you replace values within a specific range of a list?

    <p>Assign a new list to the range of indexes.</p> Signup and view all the answers

    Which method would you use to remove a specific item from a list?

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

    What will happen if you try to access an index that is out of range in a list?

    <p>Python will raise an IndexError.</p> Signup and view all the answers

    How can you check if a specific item exists in a list?

    <p>Using the in keyword.</p> Signup and view all the answers

    What is true about tuples as compared to lists in Python?

    <p>Tuples store multiple items in a single variable like lists.</p> Signup and view all the answers

    What is a requirement for naming a variable in Python?

    <p>Variable names cannot be a reserved keyword.</p> Signup and view all the answers

    Which of the following correctly casts an integer to a string in Python?

    <p>str(25)</p> Signup and view all the answers

    What output will the following code produce? print("Result: " + str(10 + 5))

    <p>Result: 15</p> Signup and view all the answers

    How can you assign the same value to multiple variables in one line?

    <p>x = y = 5</p> Signup and view all the answers

    What will print(5 + 10) output?

    <p>15</p> Signup and view all the answers

    Which of the following is NOT a valid variable name in Python?

    <p>1st_variable</p> Signup and view all the answers

    How does Python handle mixed types in print functions?

    <p>It automatically converts all types to string.</p> Signup and view all the answers

    What type of value does the float() function convert to?

    <p>Floating-point number</p> Signup and view all the answers

    Which mode of the open() function is used to read a file without modifying its content?

    <p>Read Mode (r)</p> Signup and view all the answers

    What will happen if you attempt to use Create Mode (x) on a file that already exists?

    <p>An error will be raised.</p> Signup and view all the answers

    Which Python keyword is used to manually raise an exception?

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

    Which statement is true regarding the finally block in error handling?

    <p>It executes regardless of whether an error occurred.</p> Signup and view all the answers

    In which scenario would you typically use the Append Mode (a)?

    <p>To add new data to an existing file.</p> Signup and view all the answers

    What does the read() method of a file object return by default?

    <p>The entire text of the file.</p> Signup and view all the answers

    What is the correct syntax to open a file named 'report.txt' in write mode?

    <p>f = open('report.txt', 'w')</p> Signup and view all the answers

    What will the open() function return upon successful opening of a file?

    <p>A file object.</p> Signup and view all the answers

    What does it mean that tuples are unchangeable?

    <p>Items in a tuple cannot be altered in any way once created.</p> Signup and view all the answers

    How can you check if an item is present in a tuple?

    <p>Use the in keyword.</p> Signup and view all the answers

    Which statement about dictionaries is correct?

    <p>Dictionaries are mutable and can be changed after creation.</p> Signup and view all the answers

    How can you add a new item to a dictionary?

    <p>By assigning a value to a new key.</p> Signup and view all the answers

    Which of the following methods returns all the keys in a dictionary?

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

    What operator is used to join two or more tuples?

    <ul> <li></li> </ul> Signup and view all the answers

    Which characteristic distinguishes dictionaries from tuples?

    <p>Dictionaries are ordered and changeable while tuples are not.</p> Signup and view all the answers

    What will be the result if you try to create a dictionary with two items having the same key?

    <p>The second item will overwrite the first one.</p> Signup and view all the answers

    How can you verify if Python is installed on a Windows PC?

    <p>By entering python --version in the Command Prompt</p> Signup and view all the answers

    What is the correct command to run a Python file named 'script.py' from the command line?

    <p>python script.py</p> Signup and view all the answers

    Which of the following best describes the purpose of indentation in Python?

    <p>To indicate a block of code</p> Signup and view all the answers

    In which situation would using an Integrated Development Environment (IDE) be recommended?

    <p>For larger projects needing advanced features</p> Signup and view all the answers

    How do you create a single-line comment in Python?

    <p>Start the line with #</p> Signup and view all the answers

    What is the correct way to create a multi-line comment in Python?

    <p>Start each line with #</p> Signup and view all the answers

    What is a primary feature of using IDLE for running Python code?

    <p>It serves as a lightweight environment for quick tests</p> Signup and view all the answers

    What should be the minimum number of spaces used for indentation in a Python code block?

    <p>At least one space is required</p> Signup and view all the answers

    Study Notes

    Introduction to Python

    • Most operating systems include Python pre-installed.
    • Verify installation on Windows with command: python --version.
    • Download Python for free from the official website if not installed.

    Running Python Code

    • Command Line:
      • Write code in a .py file.
      • Navigate to file directory in command line and run with python filename.py.
    • Interactive Mode:
      • Start the Python interpreter by typing python in the command line; write and run code interactively.
    • Integrated Development Environment (IDE):
      • Use IDEs like PyCharm or VS Code for more features; great for larger projects.

    Python Indentation

    • Essential for defining code blocks; not just for readability.
    • No strict rules on spaces, but four spaces is common.

    Python Comments

    • Used for in-code documentation; begin comments with #.
    • Multi-line comments can use multiple # or triple quotes which act as unassigned strings.

    Python Variables

    • Containers for data; no need for explicit type declaration.
    • Casting: Can specify data type using functions like int(), str(), float().
    • Naming rules: must start with a letter/underscore, cannot begin with a number, must be unique and cannot use reserved keywords.

    Python Data Types

    • str: Sequence of characters, enclosed in quotes.
    • int: Whole numbers without decimal points.
    • Support negative indexing for accessing characters from the end.

    Python Lists

    • Used to store multiple items; created with square brackets.
    • Can include various data types and items with the same value.
    • Indexing allows access to specific items; negative indexing is supported.
    • Methods include append() for adding items, remove() for deleting items, and pop() for removing by index.

    Python Tuples

    • Similar to lists, used to store multiple items but defined with round brackets.
    • Unchangeable; cannot add, remove, or modify items once created.
    • Access items similarly to lists, including negative indexing.

    Python Dictionaries

    • Key-value pairs for storing data; defined using curly brackets.
    • Changeable and maintain order; keys must be unique.
    • Access items using keys; use methods like keys() and values() for data retrieval.

    Python File Handling

    • Use the open() function, which requires a filename and mode.
    • Modes:
      • Read (r): Access existing files without modification.
      • Append (a): Add data to an existing file without altering it.
      • Write (w): Create and overwrite files.
      • Create (x): Generate new files, avoiding overwriting existing ones.

    Reading Files

    • The open() function returns a file object with a read() method for reading content.
    • The read() method can return the entire content or specify a number of characters to return.

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    Description

    This quiz covers the basics of Python installation and running simple Python scripts. You'll learn how to verify Python installation on a Windows PC and explore various methods to execute Python code. Perfect for beginners looking to get started with Python programming.

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