Yurttas/PL/SL/python/docs/core-python-programming/doc/20/ref/identifiers.html
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"
Identifiers are unlimited in length. Case is significant.
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