3.3. Identifiers
Identifiers are the set of valid strings which are allowed as names in a computer language. From this all-encompassing list, we segregate out those which are keywords, names that form a construct of the language. Such identifiers are reserved words which may not be used for any other purpose, or else a syntax error (SyntaxError exception) will occur.
Python also has an additional set of identifiers known as built-ins, and although they are not reserved words, use of these special names is not recommended. (Also see Section 3.3.3.)
3.3.1. Valid Python Identifiers
The rules for Python identifier strings are not unlike most other high-level programming languages:
First character must be letter or underscore ( _ )
Any additional characters ...
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