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The modulo operator (s % d) produces a formatted string, given a format string, s, and a collection of objects in a tuple or mapping object (dictionary) dThe behavior of this operator is similar to the C sprintf() functionThe format string contains two types of objects: ordinary characters (which are left unmodified) and conversion specifiers, each of which is replaced with a formatted string representing an element of the associated tuple or mapping If d is a tuple, the number of conversion specifiers must exactly match the number of objects in d If d is a mapping, each conversion specifier must be associated with a valid key name in the mapping (using parentheses, as described shortly) Each conversion specifier starts with the % character and ends with one of the conversion characters shown in Table 41
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Table 41
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String Formatting Conversions
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Decimal integer or long integer Unsigned 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
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Table 41
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Continued
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E g,G s r c %
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Floating point as [-]mddddddE xx Use %e or %E for exponents less than 4 or greater than the precision; otherwise, use %f String or any object The formatting code uses str() to generate strings Produces the same string as produced by repr() Single character Literal %
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Between the % character and the conversion character, the following modifiers may appear, in this order: 1 A key name in parentheses, which selects a specific item out of the mapping object If no such element exists, a KeyError exception is raised 2 One or more of the following: n - sign, indicating left alignment By default, values are right-aligned n + sign, indicating that the numeric sign should be included (even if positive) n 0, indicating a zero fill 3 A number specifying the minimum field widthThe converted value will be printed in a field at least this wide and padded on the left (or right if the flag is given) to make up the field width 4 A period separating the field width from a precision 5 A number specifying the maximum number of characters to be printed from a string, the number of digits following the decimal point in a floating-point number, or the minimum number of digits for an integer In addition, the asterisk (*) character may be used in place of a number in any width field If present, the width will be read from the next item in the tuple The following code illustrates a few examples:
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a b c d e r r r r r r r = = = = = = = = = = = = 42 13142783 "hello" {'x':13, 'y':154321, 'z':'world'} 5628398123741234 "a is %d" % a "%10d %f" % (a,b) "%+010d %E" % (a,b) "%(x)-10d %(y)03g" % d "%04s %s" % (c, d['z']) "%**f" % (5,3,b) "e = %d" % e # # # # # # # r r r r r r r = = = = = = = "a is 42" " 42 13142783" "+000000042 1314278E+01" "13 154" "hell world" "13143" "e = 5628398123741234"
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When used with a dictionary, the string formatting operator % is often used to mimic the string interpolation feature often found in scripting languages (eg, expansion of
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4 Operators and Expressions
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$var symbols in strings) For example, if you have a dictionary of values, you can
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expand those values into fields within a formatted string as follows:
stock = { 'name' : 'GOOG', 'shares' : 100, 'price' : 49010 } r = "%(shares)d of %(name)s at %(price)02f" % stock # r = "100 shares of GOOG at 49010"
The following code shows how to expand the values of currently defined variables within a stringThe vars() function returns a dictionary containing all of the variables defined at the point at which vars() is called
name = "Elwood" age = 41 r = "%(name)s is %(age)s years old" % vars()