Standard Character Escape Codes Description in .NET

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Table 21
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Standard Character Escape Codes Description
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Newline continuation Backslash Single quote Double quote Bell Backspace Escape Null
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Character
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\ \\ \' \" \a \b \e \0
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2 Lexical Conventions and Syntax
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Table 21
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Continued Description
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Line feed Vertical tab Horizontal tab Carriage return Form feed Octal value (\000 to \377) Unicode character (\u0000 to \uffff) Unicode character (\U00000000 to \Uffffffff) Unicode character name Hexadecimal value (\x00 to \xff)
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\n \v \t \r \f \OOO \uxxxx \Uxxxxxxxx \N{charname} \xhh
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The escape codes \OOO and \x are used to embed characters into a string literal that can t be easily typed (that is, control codes, nonprinting characters, symbols, international characters, and so on) For these escape codes, you have to specify an integer value corresponding to a character value For example, if you wanted to write a string literal for the word Jalape o , you might write it as "Jalape\xf1o" where \xf1 is the character code for In Python 2 string literals correspond to 8-bit character or byte-oriented data A serious limitation of these strings is that they do not fully support international character sets and UnicodeTo address this limitation, Python 2 uses a separate string type for Unicode dataTo write a Unicode string literal, you prefix the first quote with the letter u For example:
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s = u"Jalape\u00f1o"
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In Python 3, this prefix character is unnecessary (and is actually a syntax error) as all strings are already Unicode Python 2 will emulate this behavior if you run the interpreter with the -U option (in which case all string literals will be treated as Unicode and the u prefix can be omitted) Regardless of which Python version you are using, the escape codes of \u, \U, and \N in Table 21 are used to insert arbitrary characters into a Unicode literal Every Unicode character has an assigned code point, which is typically denoted in Unicode charts as U+XXXX where XXXX is a sequence of four or more hexadecimal digits (Note that this notation is not Python syntax but is often used by authors when describing Unicode characters) For example, the character has a code point of U+00F1The \u escape code is used to insert Unicode characters with code points in the range U+0000 to U+FFFF (for example, \u00f1)The \U escape code is used to insert characters in the range U+10000 and above (for example, \U00012345) One subtle caution concerning the \U escape code is that Unicode characters with code points above U+10000 usually get decomposed into a pair of characters known as a surrogate pairThis has to do with the internal representation of Unicode strings and is covered in more detail in 3, Types and Objects Unicode characters also have a descriptive name If you know the name, you can use the \N{character name} escape sequence For example:
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s = u"Jalape\N{LATIN SMALL LETTER N WITH TILDE}o"
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For an authoritative reference on code points and character names, consult http://wwwunicodeorg/charts Optionally, you can precede a string literal with an r or R, such as in r'\d'These strings are known as raw strings because all their backslash characters are left intact that is, the string literally contains the enclosed text, including the backslashesThe main use of raw strings is to specify literals where the backslash character has some significance Examples might include the specification of regular expression patterns with the re module or specifying a filename on a Windows machine (for example, r'c:\newdata\tests') Raw strings cannot end in a single backslash, such as r"\"Within raw strings, \uXXXX escape sequences are still interpreted as Unicode characters, provided that the number of preceding \ characters is odd For instance, ur"\u1234" defines a raw Unicode string with the single character U+1234, whereas ur"\\u1234" defines a seven-character string in which the first two characters are slashes and the remaining five characters are the literal "u1234" Also, in Python 22, the r must appear after the u in raw Unicode strings as shown In Python 30, the u prefix is unnecessary String literals should not be defined using a sequence of raw bytes that correspond to a data encoding such as UTF-8 or UTF-16 For example, directly writing a raw UTF-8 encoded string such as 'Jalape\xc3\xb1o' simply produces a nine-character string U+004A, U+0061, U+006C, U+0061, U+0070, U+0065, U+00C3, U+00B1, U+006F, which is probably not what you intendedThis is because in UTF-8, the multibyte sequence \xc3\xb1 is supposed to represent the single character U+00F1, not the two characters U+00C3 and U+00B1To specify an encoded byte string as a literal, prefix the first quote with a "b" as in b"Jalape\xc3\xb1o"When defined, this literally creates a string of single bytes From this representation, it is possible to create a normal string by decoding the value of the byte literal with its decode() method More details about this are covered in 3 and 4, Operators and Expressions The use of byte literals is quite rare in most programs because this syntax did not appear until Python 26, and in that version there is no difference between a byte literal and a normal string In Python 3, however, byte literals are mapped to a new bytes datatype that behaves differently than a normal string (see Appendix A, Python 3 )
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