Custom Functions in Java

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no use to our users (and normally they wouldn t be), we can use the -OO option which in effect strips out both assert statements and docstrings: Note that there is no environment variable for setting this option Some developers take a simpler approach: They produce a copy of their program with all assert statements commented out, and providing this passes their tests, they release the assertion-free version
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In this section we draw together some of the techniques covered in this chapter and show them in the context of a complete example program Very small Web sites are often created and maintained by hand One way to make this slightly more convenient is to have a program that can generate skeleton HTML les that can later be eshed out with content The make_html_skeletonpy program is an interactive program that prompts the user for various details and then creates a skeleton HTML le The program s main() function has a loop so that users can create skeleton after skeleton, and it retains common data (eg, copyright information) so that users don t have to type it in more than once Here is a transcript of a typical interaction:
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make_html_skeletonpy Make HTML Skeleton Enter Enter Enter Enter Enter Enter Enter Enter Enter Enter Saved your name (for copyright): Harold Pinter copyright year [2008]: 2009 filename: career-synopsis title: Career Synopsis description (optional): synopsis of the career of Harold Pinter a keyword (optional): playwright a keyword (optional): actor a keyword (optional): activist a keyword (optional): the stylesheet filename (optional): style skeleton career-synopsishtml
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Create another (y/n) [y]: Make HTML Skeleton Enter your name (for copyright) [Harold Pinter]: Enter copyright year [2009]: Enter filename: Cancelled Create another (y/n) [y]: n
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4 Control Structures and Functions
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Notice that for the second skeleton the name and year had as their defaults the values entered previously, so they did not need to be retyped But no default for the lename is provided, so when that was not given the skeleton was cancelled Now that we have seen how the program is used, we are ready to study the code The program begins with two imports:
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import datetime import xmlsaxsaxutils
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The datetime module provides some simple functions for creating datetimedate and datetimetime objects The xmlsaxsaxutils module has a useful xmlsaxsaxutilsescape() function that takes a string and returns an equivalent string with the special HTML characters ( & , < , and > ) in their escaped forms ( & , < , and > ) Three global strings are de ned; these are used as templates
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COPYRIGHT_TEMPLATE = "Copyright (c) {0} {1} All rights reserved" STYLESHEET_TEMPLATE = ('<link rel="stylesheet" type="text/css" ' 'media="all" href="{0}" />\n') HTML_TEMPLATE = """< xml version="10" > <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Strict//EN" \ "http://wwww3org/TR/xhtml1/DTD/xhtml1-strictdtd"> <html xmlns="http://wwww3org/1999/xhtml" lang="en" xml:lang="en"> <head> <title>{title}</title> <!-- {copyright} --> <meta name="Description" content="{description}" /> <meta name="Keywords" content="{keywords}" /> <meta equiv="content-type" content="text/html; charset=utf-8" /> {stylesheet}\ </head> <body> </body> </html> """
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str format()
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These strings will be used as templates in conjunction with the strformat() method In the case of HTML_TEMPLATE we have used names rather than index positions for the eld names, for example, {title} We will see shortly that we must use keyword arguments to provide values for these
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class CancelledError(Exception): pass
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One custom exception is de ned; we will see it in use when we look at a couple of the program s functions The program s main() function is used to set up some initial information, and to provide a loop On each iteration the user has the chance to enter some information for the HTML page they want generated, and after each one they are given the chance to nish
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def main(): information = dict(name=None, year=datetimedatetoday()year, filename=None, title=None, description=None, keywords=None, stylesheet=None) while True: try: print("\nMake HTML Skeleton\n") populate_information(information) make_html_skeleton(**information) except CancelledError: print("Cancelled") if (get_string("\nCreate another (y/n) ", default="y")lower() not in {"y", "yes"}): break
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The datetimedatetoday() function returns a datetimedate object that holds today s date We want just the year attribute All the other items of information are set to None since there are no sensible defaults that can be set Inside the while loop the program prints a title, then calls the populate_information() function with the information dictionary This dictionary is updated inside the populate_information() function Next, the make_html_skeleton() function is called this function takes a number of arguments, but rather than give explicit values for each one we have simply unpacked the information dictionary If the user cancels, for example, by not providing mandatory information, the program prints out Cancelled At the end of each iteration (whether cancelled or not), the user is asked whether they want to create another skeleton if they don t, we break out of the loop and the program terminates
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def populate_information(information): name = get_string("Enter your name (for copyright)", "name", information["name"]) if not name: raise CancelledError() year = get_integer("Enter copyright year", "year", information["year"], 2000, datetimedatetoday()year + 1, True)
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