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Similarly, Unicode files may also include special byte-order markers (BOM) that indicate properties of the character encodingThe Unicode character U+FEFF is reserved for this purposeTypically, the marker is written as the first character in the file Programs then read this character and look at the arrangement of the bytes to determine encoding (for example, '\xff\xfe' for UTF-16-LE or '\xfe\xff' UTF-16-BE) Once the encoding is determined, the BOM character is discarded and the remainder of the file is processed Unfortunately, all of this extra handling of the BOM is not something that happens behind the scenesYou often have to take care of this yourself if your application warrants it When the encoding is read from a document, code similar to the following can be used to turn the input file into an encoded stream:
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f = open("somefile","rb") # Determine encoding of the file # Put an appropriate encoding wrapper on the file # Assumes that the BOM (if any) has already been discarded # by earlier statements fenc = codecsEncodedFile(f,encoding) data = fencread()
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Table 93 lists some of the most commonly used encoders in the codecs module
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Table 93
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Encoders in the codecs Module Description
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ASCII encoding Latin-1 or ISO-8859-1 encoding CP437 encoding CP1252 encoding 8-bit variable-length encoding 16-bit variable-length encoding
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'ascii' 'latin-1', 'iso-8859-1' 'cp437' 'cp1252' 'utf-8' 'utf-16'
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Table 93
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Continued Description
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UTF-16, but with UTF-16, but with Same format as Same format as explicit little endian encoding explicit big endian encoding u"string" ur"string"
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Encoder
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'utf-16-le' 'utf-16-be' 'unicode-escape' 'raw-unicode-escape'
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The following sections describe each of the encoders in more detail
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'ascii' Encoding
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In 'ascii' encoding, character values are confined to the ranges [0x00,0x7f] and [U+0000, U+007F] Any character outside this range is invalid
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'iso-8859-1', 'latin-1' Encoding
Characters can be any 8-bit value in the ranges [0x00,0xff] and [U+0000, U+00FF] Values in the range [0x00,0x7f] correspond to characters from the ASCII character setValues in the range [0x80,0xff] correspond to characters from the ISO-8859-1 or extended ASCII character set Any characters with values outside the range [0x00,0xff] result in an error
'cp437' Encoding
This encoding is similar to 'iso-8859-1' but is the default encoding used by Python when it runs as a console application on Windows Certain characters in the range [x80,0xff] correspond to special symbols used for rendering menus, windows, and frames in legacy DOS applications
'cp1252' Encoding
This is an encoding that is very similar to 'iso-8859-1' used on Windows However, this encoding defines characters in the range [0x80-0x9f] that are undefined in 'iso-8859-1' and which have different code points in Unicode
'utf-8' Encoding
UTF-8 is a variable-length encoding that allows all Unicode characters to be represented A single byte is used to represent ASCII characters in the range 0 127 All other characters are represented by multibyte sequences of 2 or 3 bytesThe encoding of these bytes is shown here:
Unicode Characters
U+0000 - U+007F U+007F - U+07FF U+0800 - U+FFFF
Byte 0
0nnnnnnn 110nnnnn 1110nnnn
Byte 1
10nnnnnn 10nnnnnn
Byte 2
10nnnnnn
For 2-byte sequences, the first byte always starts with the bit sequence 110 For 3-byte sequences, the first byte starts with the bit sequence 1110 All subsequent data bytes in multibyte sequences start with the bit sequence 10 In full generality, the UTF-8 format allows for multibyte sequences of up to 6 bytes In Python, 4-byte UTF-8 sequences are used to encode a pair of Unicode characters
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9 Input and Output
known as a surrogate pair Both characters have values in the range [U+D800, U+DFFF] and are combined to encode a 20-bit character valueThe surrogate encoding is as follows:The 4-byte sequence 11110nnn 10nnnnnn 10nmmmm 10mmmmm is encoded as the pair U+D800 + N, U+DC00 + M, where N is the upper 10 bits and M is the lower 10 bits of the 20-bit character encoded in the 4-byte UTF-8 sequence Five- and 6-byte UTF-8 sequences (denoted by starting bit sequences of 111110 and 1111110, respectively) are used to encode character values up to 32 bits in lengthThese values are not supported by Python and currently result in a UnicodeError exception if they appear in an encoded data stream UTF-8 encoding has a number of useful properties that allow it to be used by older software First, the standard ASCII characters are represented in their standard encoding This means that a UTF-8 encoded ASCII string is indistinguishable from a traditional ASCII string Second, UTF-8 doesn t introduce embedded NULL bytes for multibyte character sequencesTherefore, existing software based on the C library and programs that expect NULL-terminated 8-bit strings will work with UTF-8 strings Finally, UTF-8 encoding preserves the lexicographic ordering of stringsThat is, if a and b are Unicode strings and a < b, then a < b also holds when a and b are converted to UTF-8Therefore, sorting algorithms and other ordering algorithms written for 8-bit strings will also work for UTF-8