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+
+:mod:`unicodedata` --- Unicode Database
+=======================================
+
+.. module:: unicodedata
+   :synopsis: Access the Unicode Database.
+.. moduleauthor:: Marc-Andre Lemburg <mal@lemburg.com>
+.. sectionauthor:: Marc-Andre Lemburg <mal@lemburg.com>
+.. sectionauthor:: Martin v. Löwis <martin@v.loewis.de>
+
+
+.. index::
+   single: Unicode
+   single: character
+   pair: Unicode; database
+
+This module provides access to the Unicode Character Database which defines
+character properties for all Unicode characters. The data in this database is
+based on the :file:`UnicodeData.txt` file version 4.1.0 which is publicly
+available from ftp://ftp.unicode.org/.
+
+The module uses the same names and symbols as defined by the UnicodeData File
+Format 4.1.0 (see http://www.unicode.org/Public/4.1.0/ucd/UCD.html).  It defines
+the following functions:
+
+
+.. function:: lookup(name)
+
+   Look up character by name.  If a character with the given name is found, return
+   the corresponding Unicode character.  If not found, :exc:`KeyError` is raised.
+
+
+.. function:: name(unichr[, default])
+
+   Returns the name assigned to the Unicode character *unichr* as a string. If no
+   name is defined, *default* is returned, or, if not given, :exc:`ValueError` is
+   raised.
+
+
+.. function:: decimal(unichr[, default])
+
+   Returns the decimal value assigned to the Unicode character *unichr* as integer.
+   If no such value is defined, *default* is returned, or, if not given,
+   :exc:`ValueError` is raised.
+
+
+.. function:: digit(unichr[, default])
+
+   Returns the digit value assigned to the Unicode character *unichr* as integer.
+   If no such value is defined, *default* is returned, or, if not given,
+   :exc:`ValueError` is raised.
+
+
+.. function:: numeric(unichr[, default])
+
+   Returns the numeric value assigned to the Unicode character *unichr* as float.
+   If no such value is defined, *default* is returned, or, if not given,
+   :exc:`ValueError` is raised.
+
+
+.. function:: category(unichr)
+
+   Returns the general category assigned to the Unicode character *unichr* as
+   string.
+
+
+.. function:: bidirectional(unichr)
+
+   Returns the bidirectional category assigned to the Unicode character *unichr* as
+   string. If no such value is defined, an empty string is returned.
+
+
+.. function:: combining(unichr)
+
+   Returns the canonical combining class assigned to the Unicode character *unichr*
+   as integer. Returns ``0`` if no combining class is defined.
+
+
+.. function:: east_asian_width(unichr)
+
+   Returns the east asian width assigned to the Unicode character *unichr* as
+   string.
+
+   .. versionadded:: 2.4
+
+
+.. function:: mirrored(unichr)
+
+   Returns the mirrored property assigned to the Unicode character *unichr* as
+   integer. Returns ``1`` if the character has been identified as a "mirrored"
+   character in bidirectional text, ``0`` otherwise.
+
+
+.. function:: decomposition(unichr)
+
+   Returns the character decomposition mapping assigned to the Unicode character
+   *unichr* as string. An empty string is returned in case no such mapping is
+   defined.
+
+
+.. function:: normalize(form, unistr)
+
+   Return the normal form *form* for the Unicode string *unistr*. Valid values for
+   *form* are 'NFC', 'NFKC', 'NFD', and 'NFKD'.
+
+   The Unicode standard defines various normalization forms of a Unicode string,
+   based on the definition of canonical equivalence and compatibility equivalence.
+   In Unicode, several characters can be expressed in various way. For example, the
+   character U+00C7 (LATIN CAPITAL LETTER C WITH CEDILLA) can also be expressed as
+   the sequence U+0043 (LATIN CAPITAL LETTER C) U+0327 (COMBINING CEDILLA).
+
+   For each character, there are two normal forms: normal form C and normal form D.
+   Normal form D (NFD) is also known as canonical decomposition, and translates
+   each character into its decomposed form. Normal form C (NFC) first applies a
+   canonical decomposition, then composes pre-combined characters again.
+
+   In addition to these two forms, there are two additional normal forms based on
+   compatibility equivalence. In Unicode, certain characters are supported which
+   normally would be unified with other characters. For example, U+2160 (ROMAN
+   NUMERAL ONE) is really the same thing as U+0049 (LATIN CAPITAL LETTER I).
+   However, it is supported in Unicode for compatibility with existing character
+   sets (e.g. gb2312).
+
+   The normal form KD (NFKD) will apply the compatibility decomposition, i.e.
+   replace all compatibility characters with their equivalents. The normal form KC
+   (NFKC) first applies the compatibility decomposition, followed by the canonical
+   composition.
+
+   .. versionadded:: 2.3
+
+In addition, the module exposes the following constant:
+
+
+.. data:: unidata_version
+
+   The version of the Unicode database used in this module.
+
+   .. versionadded:: 2.3
+
+
+.. data:: ucd_3_2_0
+
+   This is an object that has the same methods as the entire module, but uses the
+   Unicode database version 3.2 instead, for applications that require this
+   specific version of the Unicode database (such as IDNA).
+
+   .. versionadded:: 2.5
+
+Examples::
+
+   >>> unicodedata.lookup('LEFT CURLY BRACKET')
+   u'{'
+   >>> unicodedata.name(u'/')
+   'SOLIDUS'
+   >>> unicodedata.decimal(u'9')
+   9
+   >>> unicodedata.decimal(u'a')
+   Traceback (most recent call last):
+     File "<stdin>", line 1, in ?
+   ValueError: not a decimal
+   >>> unicodedata.category(u'A')  # 'L'etter, 'u'ppercase
+   'Lu'   
+   >>> unicodedata.bidirectional(u'\u0660') # 'A'rabic, 'N'umber
+   'AN'
+