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(python2.1-ref.info)Atoms

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Atoms
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Atoms are the most basic elements of expressions.  The simplest atoms
are identifiers or literals.  Forms enclosed in reverse quotes or in
parentheses, brackets or braces are also categorized syntactically as
atoms.  The syntax for atoms is:

     atom:      identifier | literal | enclosure
     enclosure: parenth_form|list_display|dict_display|string_conversion

Identifiers Names

Literals 2

Parenthesized forms

List displays

Dictionary displays

String conversions