Python Programming Guide

A: In Python, you don't need to declare the data type of a variable (like int x in C++). The interpreter determines the type based on the value assigned to it during runtime. Furthermore, a variable can change its type simply by being reassigned to a different value.

A: Comments are used to explain code and make it readable; they are ignored by the interpreter.

• Single-line: Starts with #.
• Multi-line/Docstrings: Enclosed in triple quotes (''' or """).

A: Interactive Mode (REPL) executes code line-by-line and is best for quick debugging. Script Mode involves saving code in a .py file, allowing for complex, reusable programs.

A:

• Immutable (Unchangeable): int, float, string, tuple. If you modify them, a new memory address is created.
• Mutable (Changeable): list, dictionary, set. You can change their content without changing their identity/memory address.

A: An Identifier is a user-defined name (variable, function name). A Keyword is a reserved word (if, while, def) that has a fixed meaning in Python and cannot be used as an identifier.

A:

• sep: Defines the character between multiple values. Default is a space.
• end: Defines what is printed at the very end of the line. Default is a newline (\n).

A: == is an Equality operator; it checks if the values are the same. is is an Identity operator; it checks if both variables point to the exact same object in memory.

A:

1. Syntax Errors: Grammar mistakes (e.g., missing :). The program won't start.
2. Runtime Errors: Unexpected events during execution (e.g., 10 / 0). The program crashes.
3. Logical Errors: The code runs but the math/output is wrong (e.g., using + instead of *). These are the hardest to find.