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CHAPTER 3 WORKING WITH STRINGS
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>>> '%10.2f' % pi # Field width 10, precision 2 ' 3.14' >>> '%.2f' % pi # Precision 2 '3.14' >>> '%.5s' % 'Guido van Rossum' 'Guido' You can use an * (asterisk) as the width or precision (or both). In that case, the number will be read from the tuple argument: >>> '%.*s' % (5, 'Guido van Rossum') 'Guido'
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Signs, Alignment, and Zero-Padding
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Before the width and precision numbers, you may put a flag, which may be either zero, plus, minus, or blank. A zero means that the number will be zero-padded: >>> '%010.2f' % pi '0000003.14' It s important to note here that the leading zero in 010 in the preceding code does not mean that the width specifier is an octal number, as it would in a normal Python number. When you use 010 as the width specifier, it means that the width should be 10 and that the number should be zero-padded, not that the width should be 8: >>> 010 8 A minus sign (-) left-aligns the value: >>> '%-10.2f' % pi '3.14 ' As you can see, any extra space is put on the right-hand side of the number. A blank ( ) means that a blank should be put in front of positive numbers. This may be useful for aligning positive and negative numbers: >>> print ('% 5d' % 10) + '\n' + ('% 5d' % -10)F 10 -10 Finally, a plus (+) means that a sign (either plus or minus) should precede both positive and negative numbers (again, useful for aligning): >>> print ('%+5d' % 10) + '\n' + ('%+5d' % -10) +10 -10
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CHAPTER 3 WORKING WITH STRINGS
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In the example shown in Listing 3-1, I use the asterisk width specifier to format a table of fruit prices, where the user enters the total width of the table. Because this information is supplied by the user, I can t hard-code the field widths in my conversion specifiers. By using the asterisk, I can have the field width read from the converted tuple. Listing 3-1. String Formatting Example # Print a formatted price list with a given width width = input('Please enter width: ') price_width = 10 item_width = width - price_width header_format = '%-*s%*s' format = '%-*s%*.2f' print '=' * width print header_format % (item_width, 'Item', price_width, 'Price') print '-' * width print print print print print format format format format format % % % % % (item_width, (item_width, (item_width, (item_width, (item_width, 'Apples', price_width, 0.4) 'Pears', price_width, 0.5) 'Cantaloupes', price_width, 1.92) 'Dried Apricots (16 oz.)', price_width, 8) 'Prunes (4 lbs.)', price_width, 12)
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print '=' * width The following is a sample run of the program: Please enter width: 35 =================================== Item Price Apples 0.40 Pears 0.50 Cantaloupes 1.92 Dried Apricots (16 oz.) 8.00 Prunes (4 lbs.) 12.00 ===================================
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CHAPTER 3 WORKING WITH STRINGS
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String Methods
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You have already encountered methods in lists. Strings have a much richer set of methods, in part because strings have inherited many of their methods from the string module where they resided as functions in earlier versions of Python (and where you may still find them, if you feel the need). Because there are so many string methods, only some of the most useful ones are described here. For a full reference, see Appendix B. In the description of the string methods, you will find references to other, related string methods in this chapter (marked See also ) or in Appendix B.
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BUT STRING ISN T DEAD
Even though string methods have completely upstaged the string module, the module still includes a few constants and functions that aren t available as string methods. The maketrans function is one example and will be discussed together with the translate method in the material that follows. The following are some useful constants available from string.2 string.digits: A string containing the digits 0 9 string.letters: A string containing all letters (uppercase and lowercase) string.lowercase: A string containing all lowercase letters string.printable: A string containing all printable characters string.punctuation: A string containing all punctuation characters string.uppercase: A string containing all uppercase letters Note that the string constant letters (such as string.letters) are locale-dependent (that is, their exact values depend on the language for which Python is configured).3 If you want to make sure you re using ASCII, you can use the variants with ascii_ in their names, such as string.ascii_letters.
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