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The module variable os.sep is a separator used in pathnames. The standard separator in UNIX is '/', the standard in Windows is '\\' (the Python syntax for a single backslash), and in Mac OS, it is ':'. (On some platforms, os.altsep contains an alternate path separator, such as '/' in Windows.) You use os.pathsep when grouping several paths, as in PYTHONPATH. The pathsep is used to separate the pathnames: ':' in UNIX, ';' in Windows, and '::' in Mac OS. The module variable os.linesep is the line separator string used in text files. In UNIX this is a single newline character ('\n'), in Mac OS it s a single carriage return character ('\r'), and in Windows it s the combination of a carriage return and a newline ('\r\n'). The urandom function uses a system-dependent source of real (or, at least, cryptographically strong) randomness. If your platform doesn t support it, you ll get a NotImplementedError.

begin open c_worker('DOE'); loop FETCH c_worker BULK COLLECT INTO t_worker limit 10; exit when t_worker.count = 0; FOR i IN t_worker.first..t_worker.last LOOP pl(t_worker(i).first_name); END LOOP; end loop; end; / The FETCH syntax used in the manual loop in Listing 5-10 is as follows:

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In Tapestry you create plain HTML pages, and using span tags or any other HTML tags, you embed Tapestry components Tapestry allows you to use static markup in the location of the components to accurately represent the look and feel of the page at design time These static placeholders (for example, a drop-down field) are replaced at runtime with a live Tapestry component This allows HTML designers to work with the actual templates used by the application, guaranteeing that the responsibility for the application look stays with the designers and functionality stays with the application developers The components view in the HTML and any possible actions taken by a user on a component are glued together with small amounts of Java code and optionally with very simple XML configuration files Tapestry uses the HiveMind IoC framework/microkernel under the covers to deal with resource and service configuration.

FETCH <cursor_name> BULK COLLECT INTO <plsql_table_name> LIMIT <limit>; where <cursor_name> is the name of an open cursor from which to fetch, and <plsql_table_name> is the name of the associative array in which to fetch the <limit> number of rows. And the FOR LOOP syntax used in the listing is as follows: FOR <index> IN <from_index>..<through_index> LOOP -- Put your PL/SQL code to execute during the loop here. END LOOP where <index> is an index value to use in the loop to address PL/SQL table elements, <from_index> is a valid index value to start with, and <through_index> is a valid index value to end with.

Starting a Web browser. The system command can be used to execute any external program, which is very useful in environments such as UNIX where you can execute programs (or commands) from the command line to list the contents of a directory, send e-mail, and so on. But it can be useful for starting programs with graphical user interfaces, too such as a Web browser. In UNIX, you can do the following (provided that you have a browser at /usr/ bin/firefox): os.system('/usr/bin/firefox') A Windows version would be (again use the path of a browser you have installed) os.system(r'c:\"Program Files"\"Mozilla Firefox"\firefox.exe') Note that I ve been careful about enclosing Program Files and Mozilla Firefox in quotes; otherwise DOS (which handles the command) balks at the whitespace. (This may be important for directories in your PYTHONPATH as well.) Note also that you have to use backslashes here because DOS gets confused by forward slashes. If you run this, you will notice that the browser tries to open a Web site named Files"\Mozilla... the part of the command after the whitespace. Also, if you try to run this from IDLE, a DOS window appears, but the browser doesn t start until you close that DOS window. All in all, not exactly ideal behavior. Another function that suits the job better is the Windows-specific function os.startfile: os.startfile(r' c:\Program Files\Mozilla Firefox\firefox.exe') As you can see, os.startfile accepts a plain path, even if it contains whitespace. (That is, don t enclose Program Files in quotes as in the os.system example.) Note that in Windows, your Python program keeps on running after the external program has been started by os.system (or os.startfile), whereas in UNIX, your Python program waits for the os.system command to finish.

CHAPTER 5 NEXT PLEASE, ONE ROW AT A TIME!