晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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.. _library-intro:

************
Introduction
************

The "Python library" contains several different kinds of components.

It contains data types that would normally be considered part of the "core" of a
language, such as numbers and lists.  For these types, the Python language core
defines the form of literals and places some constraints on their semantics, but
does not fully define the semantics.  (On the other hand, the language core does
define syntactic properties like the spelling and priorities of operators.)

The library also contains built-in functions and exceptions --- objects that can
be used by all Python code without the need of an :keyword:`import` statement.
Some of these are defined by the core language, but many are not essential for
the core semantics and are only described here.

The bulk of the library, however, consists of a collection of modules. There are
many ways to dissect this collection.  Some modules are written in C and built
in to the Python interpreter; others are written in Python and imported in
source form.  Some modules provide interfaces that are highly specific to
Python, like printing a stack trace; some provide interfaces that are specific
to particular operating systems, such as access to specific hardware; others
provide interfaces that are specific to a particular application domain, like
the World Wide Web. Some modules are available in all versions and ports of
Python; others are only available when the underlying system supports or
requires them; yet others are available only when a particular configuration
option was chosen at the time when Python was compiled and installed.

This manual is organized "from the inside out:" it first describes the built-in
functions, data types and exceptions, and finally the modules, grouped in
chapters of related modules.

This means that if you start reading this manual from the start, and skip to the
next chapter when you get bored, you will get a reasonable overview of the
available modules and application areas that are supported by the Python
library.  Of course, you don't *have* to read it like a novel --- you can also
browse the table of contents (in front of the manual), or look for a specific
function, module or term in the index (in the back).  And finally, if you enjoy
learning about random subjects, you choose a random page number (see module
:mod:`random`) and read a section or two.  Regardless of the order in which you
read the sections of this manual, it helps to start with chapter
:ref:`built-in-funcs`, as the remainder of the manual assumes familiarity with
this material.

Let the show begin!

haha - 2025