Installing Python on Ubuntu 3.9

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Questions and Answers

What does the prompt symbol '>>>' signify in the Python shell?

Python is waiting for user input (correct)

Python encountered an error

Python is executing a command

Python is running a script

What should you do if you find a Python version less than 3.9 installed?

Install Anaconda Python instead

Revisit the installation instructions (correct)

Ignore it, as it's not important

Upgrade your operating system

What command would you use to check the installed version of Python 3 on Ubuntu?

$ python3 --version (correct)

$ python3 --check

$ check python3 version

$ python3 -version

If the Python version displayed is 2.x, what should you consider doing?

Install the latest version of Python 3 (B) Signup and view all the answers

What does the command '$ lsb_release -a' provide you?

Information about the Ubuntu distribution (A) Signup and view all the answers

If the Python code in the book is tested only on a specific installation type, which type is it referring to?

Python installed as described in the section (C) Signup and view all the answers

What is the outcome of running '$ python --version' in the terminal?

It displays the version of Python 2 if installed (A) Signup and view all the answers

What is a possible limitation when installing Python using Anaconda?

It may cause compatibility issues with the book's examples (A) Signup and view all the answers

What is indicated by the '>>>' symbol in the Python interactive window?

It shows where you can type your Python code. (C) Signup and view all the answers

What can you do in the IDLE's interactive window?

Execute Python code and see results immediately. (C) Signup and view all the answers

What will happen if a Python program contains an error?

The program will indicate the error and stop execution. (D) Signup and view all the answers

Which of the following statements is true about the IDLE editor window?

You can write and save Python programs in it. (A) Signup and view all the answers

What can you see at the top of the interactive window in IDLE?

The version of Python being used and system information. (C) Signup and view all the answers

How can you check your learning progress after installing Python?

Through a free online quiz available at a specific web address. (A) Signup and view all the answers

What feature distinguishes the interactive window from the editor window in IDLE?

The interactive window executes code immediately after typing. (B) Signup and view all the answers

Which component of IDLE displays the commands to get help and view information about Python?

The interactive window. (B) Signup and view all the answers

What is a recommended maximum length for variable names in Python?

Three to four words (D) Signup and view all the answers

What naming convention is preferred for variable names in Python?

lower_case_with_underscores (B) Signup and view all the answers

Where can you find the style guide that recommends Python variable naming conventions?

PEP 8 (C) Signup and view all the answers

What happens when you reference a variable in the interactive window?

It prints the value stored in that variable. (A) Signup and view all the answers

What does PEP stand for in Python?

Python Enhancement Proposal (A) Signup and view all the answers

What is a common issue with excessively long variable names?

They can be confusing to read. (A) Signup and view all the answers

Which is NOT a benefit of following PEP 8 guidelines?

Reduces the need for comments (B) Signup and view all the answers

Which of the following is an example of a variable name in mixedCase?

numStudents (C) Signup and view all the answers

What does the last line of a traceback indicate?

The name of the error and the error message. (C) Signup and view all the answers

Why are variables important in programming?

They keep values accessible and give them context. (D) Signup and view all the answers

What is a common reason for a NameError in Python?

Referencing a variable that has not been defined. (A) Signup and view all the answers

Which statement best describes the role of the assignment operator?

It links a variable to the value assigned to it. (B) Signup and view all the answers

What type of error occurs when a program runs but encounters a problem during execution?

Runtime error (A) Signup and view all the answers

How should variable names be chosen according to Python conventions?

Names should clearly describe their purpose or value. (A) Signup and view all the answers

Which of the following is true regarding syntax errors?

They occur when the program cannot run at all. (B) Signup and view all the answers

What could the 'Hello' in the NameError example imply if it is not defined?

It indicates a typo or an undeclared variable. (B) Signup and view all the answers

What will the output be when the following code is executed: print("""An example of a...string that spans across multiple lines...and also preserves whitespace.""")?

An example of a string that spans across multiple lines and also preserves whitespace. (D) Signup and view all the answers

Which operator is used for string concatenation in Python?

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

What would be the value of magic_string after executing the following code: string1 = "abra"; string2 = "cadabra"; magic_string = string1 + string2?

abracadabra (B) Signup and view all the answers

If string1 = "Python" and string2 = "Rules", what will the result of string1 + string2 be?

PythonRules (C) Signup and view all the answers

How would you print a string with an apostrophe correctly in Python?

print("That's cool") (A) Signup and view all the answers

What will the following command output: print("Hello " + "World")?

Hello World (D) Signup and view all the answers

What will the value of full_name be after executing: full_name = first_name + " " + last_name with first_name = "Arthur" and last_name = "Dent"?

Arthur Dent (D) Signup and view all the answers

If a string is coded across multiple lines but should print on a single line, how should it be formatted?

Use backslashes to indicate continuation. (C) Signup and view all the answers

Study Notes

Python Shell

Python shell window indicates the version of Python being used and OS information.
Users should verify the Python version is 3.9 or higher, or reinstall to the latest version.
The ">>>" symbol is the prompt which indicates Python is ready for user input.

Installing Python on Ubuntu Linux

Ubuntu Linux distributions might already have Python installed, but may not be the latest version.
Users can check installed versions by using the commands: $ python --version and $ python3 --version.
If the version is less than 3.9, then install the latest version.
Ubuntu users can determine their version by running the command $ lsb_release -a and looking for the "Release" value.

Python Interactive Window

The interactive window allows users to type Python code and see the results immediately.
The interactive window displays information about the Python version, operating system, and help commands.
The >>> symbol is the prompt that indicates where to type Python code.

Python Errors

Syntax Errors occur when code is invalid.
Runtime Errors, also called exceptions, happen during program execution.
The traceback provides information about the error and helps find the source of the problem, making it easier to fix the code.

Variables

Variables allow storing values that can be used later in the code.
Variables make code more readable and efficient.
The assignment operator (=) is used to assign values to variables.

Variable Naming Conventions

Python uses lower_case_with_underscores naming convention, where variable names are lowercase and separated with underscores.
PEP-8, the Python Style Guide, recommends this style.
MixedCase was previously common, but is less popular.
Descriptive variable names make the code easier to understand by anyone reading it.

Inspecting Values

In Python, variables can be inspected in the interactive window by simply typing the variable name and pressing Enter.
For example, typing greeting and pressing Enter will display the value assigned to the variable, even if it wasn't used by the print() function.

Multiline Strings

Triple quoted strings (using three quotation marks) preserve whitespace and allow for strings that span multiple lines.

String Concatenation

The + operator can be used to join two strings together.
Concatenation happens without adding whitespace between the joined strings.
When concatenating strings, make sure to add a space character if needed to separate the strings with space or any other desired character.

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Description

This quiz focuses on verifying Python installation and ensuring version 3.9 or higher on Ubuntu Linux. Participants will learn how to check existing versions and install the latest Python. Gain familiarity with the Python shell and interactive window prompts.