Data Types in Java

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2 Data Types
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After the imports and the creation of the print_unicode_table() function, execution reaches the code shown here We begin by assuming that the user has not given a word to match on the command line If a command-line argument is given and is -h or --help, we print the program s usage information and set word to 0 as a ag to indicate that we are nished Otherwise, we set the word to a lowercase copy of the argument the user typed in If the word is not 0, then we print the table When we print the usage information we use a format speci cation that just has the format name in this case, the position number of the argument We could have written the line like this instead:
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print("usage: {0[0]} [string]"format(sysargv))
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Using this approach the rst 0 is the index position of the argument we want to use, and [0] is the index within the argument, and it works because sysargv is a list
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def print_unicode_table(word): print("decimal hex chr print("------- ----- --code = ord(" ") end = sysmaxunicode while code < end: c = chr(code) name = unicodedataname(c, "*** unknown ***") if word is None or word in namelower(): print("{0:7} {0:5X} {0:^3c} {1}"format( code, nametitle())) code += 1 {0:^40}"format("name")) {0:-<40}"format(""))
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We ve used a couple of blank lines for the sake of clarity The rst two lines of the function s suite print the title lines The rst strformat() prints the text name centered in a eld 40 characters wide, whereas the second one prints an empty string in a eld 40 characters wide, using a ll character of - , and aligned left (We must give an alignment if we specify a ll character) An alternative approach for the second line is this:
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print("------------{0}"format("-" * 40))
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Here we have used the string replication operator (*) to create a suitable string, and simply inserted it into the format string A third alternative would be to simply type in 40 - s and use a literal string We keep track of Unicode code points in the code variable, initializing it to the code point for a space (0x20) We set the end variable to be the highest
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Strings
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Unicode code point available this will vary depending on whether Python was compiled to use the UCS-2 or the UCS-4 character encoding Inside the while loop we get the Unicode character that corresponds to the code point using the chr() function The unicodedataname() function returns the Unicode character name for the given Unicode character; its optional second argument is the name to use if no character name is de ned If the user didn t specify a word (word is None), or if they did and it is in a lowercased copy of the Unicode character name, then we print the corresponding row Although we pass the code variable to the strformat() method only once, it is used three times in the format string, rst to print the code as an integer in a eld 7 characters wide (the ll character defaults to space, so we did not need to specify it), second to print the code as an uppercase hexadecimal number in a eld 5 characters wide, and third to print the Unicode character that corresponds to the code using the c format speci er, and centered in a eld with a minimum width of three characters Notice that we did not have to specify the type d in the rst format speci cation; this is because it is the default for integer arguments The second argument is the character s Unicode character name, printed using title case, that is, with the rst letter of each word uppercased, and all other letters lowercased Now that we are familiar with the versatile strformat() method, we will make great use of it throughout the rest of the book
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