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-\chapter{Introduction}
-
-This reference manual describes the Python programming language.
-It is not intended as a tutorial.
-
-While I am trying to be as precise as possible, I chose to use English
-rather than formal specifications for everything except syntax and
-lexical analysis.  This should make the document more understandable
-to the average reader, but will leave room for ambiguities.
-Consequently, if you were coming from Mars and tried to re-implement
-Python from this document alone, you might have to guess things and in
-fact you would probably end up implementing quite a different language.
-On the other hand, if you are using
-Python and wonder what the precise rules about a particular area of
-the language are, you should definitely be able to find them here.
-
-It is dangerous to add too many implementation details to a language
-reference document --- the implementation may change, and other
-implementations of the same language may work differently.  On the
-other hand, there is currently only one Python implementation, and
-its particular quirks are sometimes worth being mentioned, especially
-where the implementation imposes additional limitations.  Therefore,
-you'll find short ``implementation notes'' sprinkled throughout the
-text.
-
-Every Python implementation comes with a number of built-in and
-standard modules.  These are not documented here, but in the separate
-{\em Python Library Reference} document.  A few built-in modules are
-mentioned when they interact in a significant way with the language
-definition.
-
-\section{Notation}
-
-The descriptions of lexical analysis and syntax use a modified BNF
-grammar notation.  This uses the following style of definition:
-\index{BNF}
-\index{grammar}
-\index{syntax}
-\index{notation}
-
-\begin{verbatim}
-name:           lc_letter (lc_letter | "_")*
-lc_letter:      "a"..."z"
-\end{verbatim}
-
-The first line says that a \verb@name@ is an \verb@lc_letter@ followed by
-a sequence of zero or more \verb@lc_letter@s and underscores.  An
-\verb@lc_letter@ in turn is any of the single characters `a' through `z'.
-(This rule is actually adhered to for the names defined in lexical and
-grammar rules in this document.)
-
-Each rule begins with a name (which is the name defined by the rule)
-and a colon.  A vertical bar (\verb@|@) is used to separate
-alternatives; it is the least binding operator in this notation.  A
-star (\verb@*@) means zero or more repetitions of the preceding item;
-likewise, a plus (\verb@+@) means one or more repetitions, and a
-phrase enclosed in square brackets (\verb@[ ]@) means zero or one
-occurrences (in other words, the enclosed phrase is optional).  The
-\verb@*@ and \verb@+@ operators bind as tightly as possible;
-parentheses are used for grouping.  Literal strings are enclosed in
-quotes.  White space is only meaningful to separate tokens.
-Rules are normally contained on a single line; rules with many
-alternatives may be formatted alternatively with each line after the
-first beginning with a vertical bar.
-
-In lexical definitions (as the example above), two more conventions
-are used: Two literal characters separated by three dots mean a choice
-of any single character in the given (inclusive) range of \ASCII{}
-characters.  A phrase between angular brackets (\verb@<...>@) gives an
-informal description of the symbol defined; e.g. this could be used
-to describe the notion of `control character' if needed.
-\index{lexical definitions}
-\index{ASCII}
-
-Even though the notation used is almost the same, there is a big
-difference between the meaning of lexical and syntactic definitions:
-a lexical definition operates on the individual characters of the
-input source, while a syntax definition operates on the stream of
-tokens generated by the lexical analysis.  All uses of BNF in the next
-chapter (``Lexical Analysis'') are lexical definitions; uses in
-subsequent chapters are syntactic definitions.