Advanced String Formatting in .NET framework

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A more advanced form of string formatting is available using the sformat(*args, *kwargs) method on stringsThis method collects an arbitrary collection of positional and keyword arguments and substitutes their values into placeholders embedded in s A placeholder of the form '{n}', where n is a number, gets replaced by positional argument n supplied to format() A placeholder of the form '{name}' gets replaced by keyword argument name supplied to format Use '{{' to output a single '{' and '}}' to output a single '}' For example:
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r r r r = = = = "{0} {1} {2}"format('GOOG',100,49010) "{name} {shares} {price}"format(name='GOOG',shares=100,price=49010) "Hello {0}, your age is {age}"format("Elwood",age=47) "Use {{ and }} to output single curly braces"format()
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With each placeholder, you can additionally perform both indexing and attribute lookups For example, in '{name[n]}' where n is an integer, a sequence lookup is performed and in '{name[key]}' where key is a non-numeric string, a dictionary lookup of the form name['key'] is performed In '{nameattr}', an attribute lookup is performed Here are some examples:
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stock = { 'name' : 'GOOG', 'shares' : 100, 'price' : 49010 } r = "{0[name]} {0[shares]} {0[price]}"format(stock) x = 3 + 4j r = "{0real} {0imag}"format(x)
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In these expansions, you are only allowed to use names Arbitrary expressions, method calls, and other operations are not supported You can optionally specify a format specifier that gives more precise control over the outputThis is supplied by adding an optional format specifier to each placeholder using a colon (:), as in '{place:format_spec}' By using this specifier, you can specify column widths, decimal places, and alignment Here is an example:
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r = "{name:8} {shares:8d} {price:82f}"format (name="GOOG",shares=100,price=49010)
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The general format of a specifier is [[fill[align]][sign][0][width] [precision][type] where each part enclosed in [] is optionalThe width specifier specifies the minimum field width to use, and the align specifier is one of '<', '> , or '^' for left, right, and centered alignment within the field An optional fill character fill is used to pad the space For example:
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name = "Elwood" r = "{0:<10}"format(name) r = "{0:>10}"format(name) r = "{0:^10}"format(name) r = "{0:=^10}"format(name) # # # # r r r r = = = = 'Elwood ' ' Elwood' ' Elwood ' '==Elwood=='
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The type specifier indicates the type of dataTable 42 lists the supported format codes If not supplied, the default format code is 's' for strings, 'd' for integers, and 'f' for floats
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Table 42
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Advanced String Formatting Type Specifier Codes Output Format
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Decimal integer or long integer Binary integer or long integer Octal integer or long integer Hexadecimal integer or long integer Hexadecimal integer (uppercase letters) Floating point as [-]mdddddd Floating point as [-]mdddddde xx Floating point as [-]mddddddE xx Use e or E for exponents less than 4 or greater than the precision; otherwise, use f Same as g except that the current locale setting determines the decimal point character Multiplies a number by 100 and displays it using f format followed by a % sign String or any object The formatting code uses str() to generate strings Single character
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Character
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d b o x X f,F e E g,G n % s c
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The sign part of a format specifier is one of '+', '-', or ' ' A '+' indicates that a leading sign should be used on all numbers '-' is the default and only adds a sign character for negative numbers A ' ' adds a leading space to positive numbersThe precision part of the specifier supplies the number of digits of accuracy to use for decimals If a leading '0' is added to the field width for numbers, numeric values are padded with leading 0s to fill the space Here are some examples of formatting different kinds of numbers:
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x r r r r = = = = = 42 '{0:10d}'format(x) '{0:10x}'format(x) '{0:10b}'format(x) '{0:010b}'format(x) # # # # r r r r = = = = ' 42' ' 2a' ' 101010' '0000101010'
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y = 31415926 r = '{0:102f}'format(y)
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# r = '
314'