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(python2.1-ref.info)Identifiers and keywords

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Identifiers and keywords
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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"

Identifiers are unlimited in length.  Case is significant.

Keywords

Reserved classes of identifiers