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How to create python codecs?

 
 
yrogirg@gmail.com
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Posts: n/a
 
      08-06-2008
Actually, I need utf-8 to utf-8 encoding which would change the text
to another keyboard layout (e.g. from english to russian ghbdtn ->
привет) and would not affect other symbols.

I`m totally new to python and to more or less advanced programming. I
couldn`t find the answer to the question anywhere.

I`ve tried create simple utf to utf codec for some symbols but it
doesn`t work. Here it is.



import codecs

### Codec APIs

class Codec(codecs.Codec):

def encode(self,input,errors='strict'):
return codecs.charmap_encode(input,errors,encoding_table)

def decode(self,input,errors='strict'):
return codecs.charmap_decode(input,errors,decoding_table)

class IncrementalEncoder(codecs.IncrementalEncoder):
def encode(self, input, final=False):
return codecs.charmap_encode(input,self.errors,encoding_t able)
[0]

class IncrementalDecoder(codecs.IncrementalDecoder):
def decode(self, input, final=False):
return codecs.charmap_decode(input,self.errors,decoding_t able)
[0]

class StreamWriter(Codec,codecs.StreamWriter):
pass

class StreamReader(Codec,codecs.StreamReader):
pass

### encodings module API

def getregentry():
return codecs.CodecInfo(
name='rulayout',
encode=Codec().encode,
decode=Codec().decode,
incrementalencoder=IncrementalEncoder,
incrementaldecoder=IncrementalDecoder,
streamreader=StreamReader,
streamwriter=StreamWriter,
)


### Decoding Table

decoding_table = (
u'\u0000' # u'\u0000' -> NULL
u'\u0001' # u'\u0001' -> START OF HEADING
u'\u0002' # u'\u0002' -> START OF TEXT
u'\u0003' # u'\u0003' -> END OF TEXT
u'\u0004' # u'\u0004' -> END OF TRANSMISSION
u'\u0005' # u'\u0005' -> ENQUIRY
u'\u0006' # u'\u0006' -> ACKNOWLEDGE
u'\u0007' # u'\u0007' -> BELL
u'\u0008' # u'\u0008' -> BACKSPACE
u'\u0009' # u'\u0009' -> HORIZONTAL TABULATION
u'\u000A' # u'\u000A' -> LINE FEED
u'\u000B' # u'\u000B' -> VERTICAL TABULATION
u'\u000C' # u'\u000C' -> FORM FEED
u'\u000D' # u'\u000D' -> CARRIAGE RETURN
u'\u000E' # u'\u000E' -> SHIFT OUT
u'\u000F' # u'\u000F' -> SHIFT IN
u'\u0010' # u'\u0010' -> DATA LINK ESCAPE
u'\u0011' # u'\u0011' -> DEVICE CONTROL ONE
u'\u0012' # u'\u0012' -> DEVICE CONTROL TWO
u'\u0013' # u'\u0013' -> DEVICE CONTROL THREE
u'\u0014' # u'\u0014' -> DEVICE CONTROL FOUR
u'\u0015' # u'\u0015' -> NEGATIVE ACKNOWLEDGE
u'\u0016' # u'\u0016' -> SYNCHRONOUS IDLE
u'\u0017' # u'\u0017' -> END OF TRANSMISSION BLOCK
u'\u0018' # u'\u0018' -> CANCEL
u'\u0019' # u'\u0019' -> END OF MEDIUM
u'\u001A' # u'\u001A' -> SUBSTITUTE
u'\u001B' # u'\u001B' -> ESCAPE
u'\u001C' # u'\u001C' -> FILE SEPARATOR
u'\u001D' # u'\u001D' -> GROUP SEPARATOR
u'\u001E' # u'\u001E' -> RECORD SEPARATOR
u'\u001F' # u'\u001F' -> UNIT SEPARATOR
u'\u0020' # u'\u0020' -> SPACE
u'\u0021' # u'\u0021' -> EXCLAMATION MARK
u'\u0022' # u'\u0022' -> QUOTATION MARK
u'\u0023' # u'\u0023' -> NUMBER SIGN
u'\u0024' # u'\u0024' -> DOLLAR SIGN
u'\u0025' # u'\u0025' -> PERCENT SIGN
u'\u0026' # u'\u0026' -> AMPERSAND
u'\u0027' # u'\u0027' -> APOSTROPHE
u'\u0028' # u'\u0028' -> LEFT PARENTHESIS
u'\u0029' # u'\u0029' -> RIGHT PARENTHESIS
u'\u002A' # u'\u002A' -> ASTERISK
u'\u002B' # u'\u002B' -> PLUS SIGN
u'\u002C' # u'\u002C' -> COMMA
u'\u002D' # u'\u002D' -> HYPHEN-MINUS
u'\u002E' # u'\u002E' -> FULL STOP
u'\u002F' # u'\u002F' -> SOLIDUS
u'\u0030' # u'\u0030' -> DIGIT ZERO
u'\u0031' # u'\u0031' -> DIGIT ONE
u'\u0032' # u'\u0032' -> DIGIT TWO
u'\u0033' # u'\u0033' -> DIGIT THREE
u'\u0034' # u'\u0034' -> DIGIT FOUR
u'\u0035' # u'\u0035' -> DIGIT FIVE
u'\u0036' # u'\u0036' -> DIGIT SIX
u'\u0037' # u'\u0037' -> DIGIT SEVEN
u'\u0038' # u'\u0038' -> DIGIT EIGHT
u'\u0039' # u'\u0039' -> DIGIT NINE
u'\u003A' # u'\u003A' -> COLON
u'\u003B' # u'\u003B' -> SEMICOLON
u'\u003C' # u'\u003C' -> LESS-THAN SIGN
u'\u003D' # u'\u003D' -> EQUALS SIGN
u'\u003E' # u'\u003E' -> GREATER-THAN SIGN
u'\u003F' # u'\u003F' -> QUESTION MARK
u'\u0040' # u'\u0040' -> COMMERCIAL AT
u'\u0041' # u'\u0041' -> LATIN CAPITAL LETTER A
u'\u0042' # u'\u0042' -> LATIN CAPITAL LETTER B
u'\u0043' # u'\u0043' -> LATIN CAPITAL LETTER C
u'\u0044' # u'\u0044' -> LATIN CAPITAL LETTER D
u'\u0045' # u'\u0045' -> LATIN CAPITAL LETTER E
u'\u0046' # u'\u0046' -> LATIN CAPITAL LETTER F
u'\u0047' # u'\u0047' -> LATIN CAPITAL LETTER G
u'\u0048' # u'\u0048' -> LATIN CAPITAL LETTER H
u'\u0049' # u'\u0049' -> LATIN CAPITAL LETTER I
u'\u004A' # u'\u004A' -> LATIN CAPITAL LETTER J
u'\u004B' # u'\u004B' -> LATIN CAPITAL LETTER K
u'\u004C' # u'\u004C' -> LATIN CAPITAL LETTER L
u'\u004D' # u'\u004D' -> LATIN CAPITAL LETTER M
u'\u004E' # u'\u004E' -> LATIN CAPITAL LETTER N
u'\u004F' # u'\u004F' -> LATIN CAPITAL LETTER O
u'\u0050' # u'\u0050' -> LATIN CAPITAL LETTER P
u'\u0051' # u'\u0051' -> LATIN CAPITAL LETTER Q
u'\u0052' # u'\u0052' -> LATIN CAPITAL LETTER R
u'\u0053' # u'\u0053' -> LATIN CAPITAL LETTER S
u'\u0054' # u'\u0054' -> LATIN CAPITAL LETTER T
u'\u0055' # u'\u0055' -> LATIN CAPITAL LETTER U
u'\u0056' # u'\u0056' -> LATIN CAPITAL LETTER V
u'\u0057' # u'\u0057' -> LATIN CAPITAL LETTER W
u'\u0058' # u'\u0058' -> LATIN CAPITAL LETTER X
u'\u0059' # u'\u0059' -> LATIN CAPITAL LETTER Y
u'\u005A' # u'\u005A' -> LATIN CAPITAL LETTER Z
u'\u005B' # u'\u005B' -> LEFT SQUARE BRACKET
u'\u005C' # u'\u005C' -> REVERSE SOLIDUS
u'\u005D' # u'\u005D' -> RIGHT SQUARE BRACKET
u'\u005E' # u'\u005E' -> CIRCUMFLEX ACCENT
u'\u005F' # u'\u005F' -> LOW LINE
u'\u0060' # u'\u0060' -> GRAVE ACCENT
u'\u0061' # u'\u0061' -> LATIN SMALL LETTER A
u'\u0062' # u'\u0062' -> LATIN SMALL LETTER B
u'\u0063' # u'\u0063' -> LATIN SMALL LETTER C
u'\u0064' # u'\u0064' -> LATIN SMALL LETTER D
u'\u0065' # u'\u0065' -> LATIN SMALL LETTER E
u'\u0066' # u'\u0066' -> LATIN SMALL LETTER F
u'\u0067' # u'\u0067' -> LATIN SMALL LETTER G
u'\u0068' # u'\u0068' -> LATIN SMALL LETTER H
u'\u0069' # u'\u0069' -> LATIN SMALL LETTER I
u'\u006A' # u'\u006A' -> LATIN SMALL LETTER J
u'\u006B' # u'\u006B' -> LATIN SMALL LETTER K
u'\u006C' # u'\u006C' -> LATIN SMALL LETTER L
u'\u006D' # u'\u006D' -> LATIN SMALL LETTER M
u'\u006E' # u'\u006E' -> LATIN SMALL LETTER N
u'\u006F' # u'\u006F' -> LATIN SMALL LETTER O
u'\u0070' # u'\u0070' -> LATIN SMALL LETTER P
u'\u0071' # u'\u0071' -> LATIN SMALL LETTER Q
u'\u0072' # u'\u0072' -> LATIN SMALL LETTER R
u'\u0073' # u'\u0073' -> LATIN SMALL LETTER S
u'\u0074' # u'\u0074' -> LATIN SMALL LETTER T
u'\u0075' # u'\u0075' -> LATIN SMALL LETTER U
u'\u0076' # u'\u0076' -> LATIN SMALL LETTER V
u'\u0077' # u'\u0077' -> LATIN SMALL LETTER W
u'\u0078' # u'\u0078' -> LATIN SMALL LETTER X
u'\u0079' # u'\u0079' -> LATIN SMALL LETTER Y
u'\u007A' # u'\u007A' -> LATIN SMALL LETTER Z
u'\u007B' # u'\u007B' -> LEFT CURLY BRACKET
u'\u007C' # u'\u007C' -> VERTICAL LINE
u'\u007D' # u'\u007D' -> RIGHT CURLY BRACKET
u'\u007E' # u'\u007E' -> TILDE
u'\u007F' # u'\u007F' -> DELETE
u'\u0080' # u'\u0080' -> <control>
u'\u0081' # u'\u0081' -> <control>
u'\u0082' # u'\u0082' -> <control>
u'\u0083' # u'\u0083' -> <control>
u'\u0084' # u'\u0084' -> <control>
u'\u0085' # u'\u0085' -> <control>
u'\u0086' # u'\u0086' -> <control>
u'\u0087' # u'\u0087' -> <control>
u'\u0088' # u'\u0088' -> <control>
u'\u0089' # u'\u0089' -> <control>
u'\u008A' # u'\u008A' -> <control>
u'\u008B' # u'\u008B' -> <control>
u'\u008C' # u'\u008C' -> <control>
u'\u008D' # u'\u008D' -> <control>
u'\u008E' # u'\u008E' -> <control>
u'\u008F' # u'\u008F' -> <control>
u'\u0090' # u'\u0090' -> <control>
u'\u0091' # u'\u0091' -> <control>
u'\u0092' # u'\u0092' -> <control>
u'\u0093' # u'\u0093' -> <control>
u'\u0094' # u'\u0094' -> <control>
u'\u0095' # u'\u0095' -> <control>
u'\u0096' # u'\u0096' -> <control>
u'\u0097' # u'\u0097' -> <control>
u'\u0098' # u'\u0098' -> <control>
u'\u0099' # u'\u0099' -> <control>
u'\u009A' # u'\u009A' -> <control>
u'\u009B' # u'\u009B' -> <control>
u'\u009C' # u'\u009C' -> <control>
u'\u009D' # u'\u009D' -> <control>
u'\u009E' # u'\u009E' -> <control>
u'\u009F' # u'\u009F' -> <control>
u'\u00A0' # u'\u00A0' -> NO-BREAK SPACE
u'\u0401' # u'\u0401' -> CYRILLIC CAPITAL LETTER IO
u'\u0402' # u'\u0402' -> CYRILLIC CAPITAL LETTER DJE
u'\u0403' # u'\u0403' -> CYRILLIC CAPITAL LETTER GJE
u'\u0404' # u'\u0404' -> CYRILLIC CAPITAL LETTER UKRAINIAN IE
u'\u0405' # u'\u0405' -> CYRILLIC CAPITAL LETTER DZE
u'\u0406' # u'\u0406' -> CYRILLIC CAPITAL LETTER BYELORUSSIAN-
UKRAINIAN I
u'\u0407' # u'\u0407' -> CYRILLIC CAPITAL LETTER YI
u'\u0408' # u'\u0408' -> CYRILLIC CAPITAL LETTER JE
u'\u0409' # u'\u0409' -> CYRILLIC CAPITAL LETTER LJE
u'\u040A' # u'\u040A' -> CYRILLIC CAPITAL LETTER NJE
u'\u040B' # u'\u040B' -> CYRILLIC CAPITAL LETTER TSHE
u'\u040C' # u'\u040C' -> CYRILLIC CAPITAL LETTER KJE
u'\u00AD' # u'\u00AD' -> SOFT HYPHEN
u'\u040E' # u'\u040E' -> CYRILLIC CAPITAL LETTER SHORT U
u'\u040F' # u'\u040F' -> CYRILLIC CAPITAL LETTER DZHE
u'\u0410' # u'\u0410' -> CYRILLIC CAPITAL LETTER A
u'\u0411' # u'\u0411' -> CYRILLIC CAPITAL LETTER BE
u'\u0412' # u'\u0412' -> CYRILLIC CAPITAL LETTER VE
u'\u0413' # u'\u0413' -> CYRILLIC CAPITAL LETTER GHE
u'\u0414' # u'\u0414' -> CYRILLIC CAPITAL LETTER DE
u'\u0415' # u'\u0415' -> CYRILLIC CAPITAL LETTER IE
u'\u0416' # u'\u0416' -> CYRILLIC CAPITAL LETTER ZHE
u'\u0417' # u'\u0417' -> CYRILLIC CAPITAL LETTER ZE
u'\u0418' # u'\u0418' -> CYRILLIC CAPITAL LETTER I
u'\u0419' # u'\u0419' -> CYRILLIC CAPITAL LETTER SHORT I
u'\u041A' # u'\u041A' -> CYRILLIC CAPITAL LETTER KA
u'\u041B' # u'\u041B' -> CYRILLIC CAPITAL LETTER EL
u'\u041C' # u'\u041C' -> CYRILLIC CAPITAL LETTER EM
u'\u041D' # u'\u041D' -> CYRILLIC CAPITAL LETTER EN
u'\u041E' # u'\u041E' -> CYRILLIC CAPITAL LETTER O
u'\u041F' # u'\u041F' -> CYRILLIC CAPITAL LETTER PE
u'\u0420' # u'\u0420' -> CYRILLIC CAPITAL LETTER ER
u'\u0421' # u'\u0421' -> CYRILLIC CAPITAL LETTER ES
u'\u0422' # u'\u0422' -> CYRILLIC CAPITAL LETTER TE
u'\u0423' # u'\u0423' -> CYRILLIC CAPITAL LETTER U
u'\u0424' # u'\u0424' -> CYRILLIC CAPITAL LETTER EF
u'\u0425' # u'\u0425' -> CYRILLIC CAPITAL LETTER HA
u'\u0426' # u'\u0426' -> CYRILLIC CAPITAL LETTER TSE
u'\u0427' # u'\u0427' -> CYRILLIC CAPITAL LETTER CHE
u'\u0428' # u'\u0428' -> CYRILLIC CAPITAL LETTER SHA
u'\u0429' # u'\u0429' -> CYRILLIC CAPITAL LETTER SHCHA
u'\u042A' # u'\u042A' -> CYRILLIC CAPITAL LETTER HARD SIGN
u'\u042B' # u'\u042B' -> CYRILLIC CAPITAL LETTER YERU
u'\u042C' # u'\u042C' -> CYRILLIC CAPITAL LETTER SOFT SIGN
u'\u042D' # u'\u042D' -> CYRILLIC CAPITAL LETTER E
u'\u042E' # u'\u042E' -> CYRILLIC CAPITAL LETTER YU
u'\u042F' # u'\u042F' -> CYRILLIC CAPITAL LETTER YA
u'\u0430' # u'\u0430' -> CYRILLIC SMALL LETTER A
u'\u0431' # u'\u0431' -> CYRILLIC SMALL LETTER BE
u'\u0432' # u'\u0432' -> CYRILLIC SMALL LETTER VE
u'\u0433' # u'\u0433' -> CYRILLIC SMALL LETTER GHE
u'\u0434' # u'\u0434' -> CYRILLIC SMALL LETTER DE
u'\u0435' # u'\u0435' -> CYRILLIC SMALL LETTER IE
u'\u0436' # u'\u0436' -> CYRILLIC SMALL LETTER ZHE
u'\u0437' # u'\u0437' -> CYRILLIC SMALL LETTER ZE
u'\u0438' # u'\u0438' -> CYRILLIC SMALL LETTER I
u'\u0439' # u'\u0439' -> CYRILLIC SMALL LETTER SHORT I
u'\u043A' # u'\u043A' -> CYRILLIC SMALL LETTER KA
u'\u043B' # u'\u043B' -> CYRILLIC SMALL LETTER EL
u'\u043C' # u'\u043C' -> CYRILLIC SMALL LETTER EM
u'\u043D' # u'\u043D' -> CYRILLIC SMALL LETTER EN
u'\u043E' # u'\u043E' -> CYRILLIC SMALL LETTER O
u'\u043F' # u'\u043F' -> CYRILLIC SMALL LETTER PE
u'\u0440' # u'\u0440' -> CYRILLIC SMALL LETTER ER
u'\u0441' # u'\u0441' -> CYRILLIC SMALL LETTER ES
u'\u0442' # u'\u0442' -> CYRILLIC SMALL LETTER TE
u'\u0443' # u'\u0443' -> CYRILLIC SMALL LETTER U
u'\u0444' # u'\u0444' -> CYRILLIC SMALL LETTER EF
u'\u0445' # u'\u0445' -> CYRILLIC SMALL LETTER HA
u'\u0446' # u'\u0446' -> CYRILLIC SMALL LETTER TSE
u'\u0447' # u'\u0447' -> CYRILLIC SMALL LETTER CHE
u'\u0448' # u'\u0448' -> CYRILLIC SMALL LETTER SHA
u'\u0449' # u'\u0449' -> CYRILLIC SMALL LETTER SHCHA
u'\u044A' # u'\u044A' -> CYRILLIC SMALL LETTER HARD SIGN
u'\u044B' # u'\u044B' -> CYRILLIC SMALL LETTER YERU
u'\u044C' # u'\u044C' -> CYRILLIC SMALL LETTER SOFT SIGN
u'\u044D' # u'\u044D' -> CYRILLIC SMALL LETTER E
u'\u044E' # u'\u044E' -> CYRILLIC SMALL LETTER YU
u'\u044F' # u'\u044F' -> CYRILLIC SMALL LETTER YA
u'\u2116' # u'\u2116' -> NUMERO SIGN
u'\u0451' # u'\u0451' -> CYRILLIC SMALL LETTER IO
u'\u0452' # u'\u0452' -> CYRILLIC SMALL LETTER DJE
u'\u0453' # u'\u0453' -> CYRILLIC SMALL LETTER GJE
u'\u0454' # u'\u0454' -> CYRILLIC SMALL LETTER UKRAINIAN IE
u'\u0455' # u'\u0455' -> CYRILLIC SMALL LETTER DZE
u'\u0456' # u'\u0456' -> CYRILLIC SMALL LETTER BYELORUSSIAN-
UKRAINIAN I
u'\u0457' # u'\u0457' -> CYRILLIC SMALL LETTER YI
u'\u0458' # u'\u0458' -> CYRILLIC SMALL LETTER JE
u'\u0459' # u'\u0459' -> CYRILLIC SMALL LETTER LJE
u'\u045A' # u'\u045A' -> CYRILLIC SMALL LETTER NJE
u'\u045B' # u'\u045B' -> CYRILLIC SMALL LETTER TSHE
u'\u045C' # u'\u045C' -> CYRILLIC SMALL LETTER KJE
u'\u00A7' # u'\u00A7' -> SECTION SIGN
u'\u045E' # u'\u045E' -> CYRILLIC SMALL LETTER SHORT U
u'\u045F' # u'\u045F' -> CYRILLIC SMALL LETTER DZHE
)

### Encoding table
encoding_table=codecs.charmap_build(decoding_table )
 
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