unicodedata --- Unicode 資料庫¶

This module provides access to the Unicode Character Database (UCD) whichdefines character properties for all Unicode characters. The data contained inthis database is compiled from theUCD version 16.0.0.

The module uses the same names and symbols as defined by UnicodeStandard Annex #44,"Unicode Character Database". It defines thefollowing functions:

unicodedata.lookup(name)¶

Look up character by name. If a character with the given name is found, returnthe corresponding character. If not found,KeyError is raised.For example:

>>>unicodedata.lookup('LEFT CURLY BRACKET')'{'

The characters returned by this function are the same as those produced by\N escape sequence in string literals. For example:

>>>unicodedata.lookup('MIDDLE DOT')=='\N{MIDDLE DOT}'True

在 3.3 版的變更:已新增對名稱別名[1] 和命名序列[2] 的支援。

unicodedata.name(chr,default=None,/)¶

Returns the name assigned to the characterchr as a string. If noname is defined,default is returned, or, if not given,ValueError israised. For example:

>>>unicodedata.name('½')'VULGAR FRACTION ONE HALF'>>>unicodedata.name('\uFFFF','fallback')'fallback'

unicodedata.decimal(chr,default=None,/)¶

Returns the decimal value assigned to the characterchr as integer.If no such value is defined,default is returned, or, if not given,ValueError is raised. For example:

>>>unicodedata.decimal('\N{ARABIC-INDIC DIGIT NINE}')9>>>unicodedata.decimal('\N{SUPERSCRIPT NINE}',-1)-1

unicodedata.digit(chr,default=None,/)¶

Returns the digit value assigned to the characterchr as integer.If no such value is defined,default is returned, or, if not given,ValueError is raised:

>>>unicodedata.digit('\N{SUPERSCRIPT NINE}')9

unicodedata.numeric(chr,default=None,/)¶

Returns the numeric value assigned to the characterchr as float.If no such value is defined,default is returned, or, if not given,ValueError is raised:

>>>unicodedata.numeric('½')0.5

unicodedata.category(chr)¶

Returns the general category assigned to the characterchr asstring. General category names consist of two letters.See theGeneral Category Values section of the Unicode CharacterDatabase documentationfor a list of category codes. For example:

>>>unicodedata.category('A')# 'L'etter, 'u'ppercase'Lu'

unicodedata.bidirectional(chr)¶

Returns the bidirectional class assigned to the characterchr asstring. If no such value is defined, an empty string is returned.See theBidirectional Class Values section of the Unicode CharacterDatabasedocumentation for a list of bidirectional codes. For example:

>>>unicodedata.bidirectional('\N{ARABIC-INDIC DIGIT SEVEN}')# 'A'rabic, 'N'umber'AN'

unicodedata.combining(chr)¶

Returns the canonical combining class assigned to the characterchras integer. Returns0 if no combining class is defined.See theCanonical Combining Class Values section of the Unicode CharacterDatabasefor more information.

unicodedata.east_asian_width(chr)¶

Returns the east asian width assigned to the characterchr asstring. For a list of widths and or more information, see theUnicode Standard Annex #11.

unicodedata.mirrored(chr)¶

Returns the mirrored property assigned to the characterchr asinteger. Returns1 if the character has been identified as a "mirrored"character in bidirectional text,0 otherwise. For example:

>>>unicodedata.mirrored('>')1

unicodedata.decomposition(chr)¶

Returns the character decomposition mapping assigned to the characterchr as string. An empty string is returned in case no such mapping isdefined. For example:

>>>unicodedata.decomposition('Ã')'0041 0303'

unicodedata.normalize(form,unistr)¶

Return the normal formform for the Unicode stringunistr. Valid values forform 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, thecharacter U+00C7 (LATIN CAPITAL LETTER C WITH CEDILLA) can also be expressed asthe 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 translateseach character into its decomposed form. Normal form C (NFC) first applies acanonical decomposition, then composes pre-combined characters again.

In addition to these two forms, there are two additional normal forms based oncompatibility equivalence. In Unicode, certain characters are supported whichnormally would be unified with other characters. For example, U+2160 (ROMANNUMERAL ONE) is really the same thing as U+0049 (LATIN CAPITAL LETTER I).However, it is supported in Unicode for compatibility with existing charactersets (for example, gb2312).

The normal form KD (NFKD) will apply the compatibility decomposition, that is,replace all compatibility characters with their equivalents. The normal form KC(NFKC) first applies the compatibility decomposition, followed by the canonicalcomposition.

Even if two unicode strings are normalized and look the same toa human reader, if one has combining characters and the otherdoesn't, they may not compare equal.

unicodedata.is_normalized(form,unistr)¶

Return whether the Unicode stringunistr is in the normal formform. Validvalues forform are 'NFC', 'NFKC', 'NFD', and 'NFKD'.

在 3.8 版被加入.

In addition, the module exposes the following constant:

unicodedata.unidata_version¶

在此模組中使用的 Unicode 資料庫版本。

unicodedata.ucd_3_2_0¶

This is an object that has the same methods as the entire module, but uses theUnicode database version 3.2 instead, for applications that require thisspecific version of the Unicode database (such as IDNA).

註腳

https://www.unicode.org/Public/16.0.0/ucd/NameAliases.txt

https://www.unicode.org/Public/16.0.0/ucd/NamedSequences.txt