Python Programming Concepts

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Variable

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Named storage location for a value (e.g., citizens = 330_000_000)

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Literal

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Fixed value written in source code (e.g., 42, 'USA', True)

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Identifier

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Name given to variables, functions, etc. (e.g., tax_rate in snake_case)

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Keyword

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Reserved word with special meaning (e.g., def, while, import)

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Operator

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Symbol that performs an operation (e.g., +, //, in)

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Expression

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Code that produces a value (e.g., x * 2 + 1)

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Statement

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Complete instruction (e.g., print('Hello'))

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Block

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Group of statements indented at the same level (e.g., if x: …)

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Scope

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Region where a name is visible (e.g., LEGB order)

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LEGB

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Local → Enclosing → Global → Built-in scope order (e.g., global x)