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Python: Essential Reference, Third Edition by David Beazley

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Identifiers and Reserved Words

An identifier is a name used to identify variables, functions, classes, modules, and other objects. Identifiers can include letters, numbers, and the underscore character (_), but must always start with a nonnumeric character. Letters are currently confined to the characters A–Z and a–z in the ISO-Latin character set. Because identifiers are case sensitive, FOO is different from foo. Special symbols such as $, %, and @ are not allowed in identifiers. In addition, words such as if, else, and for are reserved and cannot be used as identifier names. The following list shows all the reserved words:

     
andelifglobaloryield
assertelseifpass 
breakexceptimportprint 
classexecinraise 
continuefinallyisreturn 
defforlambda ...

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