This document defines key concepts in programming including values, types, variables, expressions, operators, integers, floating-point numbers, strings, concatenation, iterables, and objects. It explains that values are basic data units like numbers or strings that programs manipulate, while types categorize these values into categories like integers, floats, and strings. Variables are names that refer to values, and expressions combine variables, operators, and values to produce a single result.

1. Core Concepts: Key Definitions
• value: One of the basic units of data, like a number or string, that a
program manipulates.
• type: A category of values. The types we have seen so far are integers
(type int), floating point numbers (type float), and strings (type str).
• variable: A name that refers to a value.
• expression: A combination of variables, operators,and values that
represents a single result value.
• operator: A special symbol that represents a simple computation like
addition, multiplication,or string concatenation.
• integer: A type that represents whole numbers.
• floating-point: A type that represents numbers with fractional parts.
Ahmed Sobhy Abdel Mobdy 1

2. Core Concepts: Key Definitions
• string: A type that represents sequences of characters.
• concatenate: To join two operands end-to-end
• iterable: objects capable of returning its members one at a time. Some examples
are List, Tuple, String, Dictionary and Set
• object: is a unit of data(have one or more attributes) of particular class with associated
functionality(methods)
Ahmed Sobhy Abdel Mobdy 2