Introduction to Python Programming

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Questions and Answers

What is a characteristic of Python regarding its syntax?

It has a complex structure.
It has a clearly defined syntax and relatively simple structure. (correct)
It is case-insensitive.
It has no predefined functions.

What is the purpose of a Python interpreter?

To compile Python code into machine code.
To perform static code analysis.
To write and run Python programs.
To provide a platform-independent environment for running Python code. (correct)

What is the significance of the symbol >>> in a Python interpreter?

It indicates a syntax error.
It is used to define a function.
It is the Python prompt, indicating the interpreter is ready to take instructions. (correct)
It represents a block of code.

Why is Python considered portable?

Because it can run on various operating systems and hardware platforms. (B) Signup and view all the answers

What is a feature of Python's library?

It has a rich library of predefined functions. (C) Signup and view all the answers

How does Python handle block and nested blocks?

Using indentation. (C) Signup and view all the answers

What is a benefit of using Python in web development?

Many popular web services and applications are built using Python. (D) Signup and view all the answers

How does Python treat 'NUMBER' and 'number'?

They are treated as different. (B) Signup and view all the answers

What is the purpose of identifiers in Python?

To identify a variable, function, or other entities in a program (C) Signup and view all the answers

Which of the following is a valid identifier in Python?

_hello (C) Signup and view all the answers

What is the purpose of the 'finally' keyword in Python?

To execute a block of code regardless of an exception (D) Signup and view all the answers

Which of the following is a Python keyword?

global (A), nonlocal (D) Signup and view all the answers

What is the purpose of the 'lambda' keyword in Python?

To define a lambda function (B) Signup and view all the answers

Which of the following is not a valid character in a Python identifier?

$ (D) Signup and view all the answers

What is the purpose of the 'try' keyword in Python?

To handle an exception (B) Signup and view all the answers

Which of the following is a true statement about Python identifiers?

They should not be a keyword or reserved word (A) Signup and view all the answers

What is the primary purpose of the interactive mode in Python?

To execute individual Python statements instantly (B) Signup and view all the answers

How do you typically execute a Python script?

By typing the file name along with the path at the prompt (C) Signup and view all the answers

What is the file extension typically used for Python scripts?

.py (B) Signup and view all the answers

What is a limitation of working in the interactive mode?

Statements cannot be saved for future use (A) Signup and view all the answers

How do you write a Python program in script mode?

By writing code in a file and saving it with a .py extension (A) Signup and view all the answers

What is the main difference between interactive and script modes?

Interactive mode allows for instant execution, script mode allows for saving code (C) Signup and view all the answers

What happens when you press enter after typing a Python statement in interactive mode?

The interpreter executes the statement and displays the result (C) Signup and view all the answers

What is the purpose of the >>> prompt in Python?

To prompt the user to type a Python statement (C) Signup and view all the answers

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Study Notes

Characteristics of Python

Python programs have a clearly defined syntax and simple structure.
Python is case-sensitive, meaning NUMBER and number are not the same.
Python is portable and platform-independent, meaning it can run on various operating systems and hardware platforms.
Python has a rich library of predefined functions.
Python is also helpful in web development, with many popular web services and applications built using it.
Python uses indentation for blocks and nested blocks.

Working with Python

To write and run a Python program, a Python interpreter needs to be installed on the computer or an online Python interpreter can be used.
The Python interpreter is also known as the Python shell.
The interpreter has a prompt, >>>, which indicates it is ready to take instructions.

Python Keywords

There are several keywords in Python, including:
- False, class, finally, is, return, None, continue, for, lambda, try
- True, def, from, nonlocal, while, and, del, global, not, with
- as, elif, if, or, yield, assert, else, import, pass, raise
- break, except, in, raise

Identifiers in Python

Identifiers are names used to identify variables, functions, or other entities in a program.
Identifiers in Python should begin with an uppercase or lowercase alphabet, or an underscore sign (_).
Identifiers can be of any length, but it is preferred to keep them short and meaningful.
Identifiers cannot start with a digit and should not be a keyword or reserved word.
Examples of identifiers include marks1, marks2, marks3, and avg.

Execution Modes in Python

There are two ways to use the Python interpreter: interactive mode and script mode.
In interactive mode, individual statements can be executed instantaneously.
In script mode, a Python program can be written in a file, saved, and then executed.
Python scripts are saved as files with a .py extension.