Python Reference Manual

2.3 Identifiers and keywords

Identifiers (also referred to as names) are described by the following lexical definitions:

identifier	::=	(letter|"_") (letter | digit | "_")*
letter	::=	lowercase | uppercase
lowercase	::=	"a"..."z"
uppercase	::=	"A"..."Z"
digit	::=	"0"..."9"

Download entire grammar as text.

Identifiers are unlimited in length. Case is significant.

• 2.3.1 Keywords
• 2.3.2 Reserved classes of identifiers

Python Reference Manual

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Release 2.4c1, documentation updated on 18 November 2004.