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If you cannot guarantee what information an FTP server might choose to return from its dir() command, how are you going to tell directories from normal files an essential step to downloading entire trees of files from the server The answer, shown in Listing 17 9, is to simply try a cwd() into every name that nlst() returns and, if you succeed, conclude that the entity is a directory! This sample program does not do any actual downloading; instead, to keep things simple (and not flood your disk with sample data), it simply prints out the directories it visits to the screen. Listing 17 9. Trying to Recurse into Directories #!/usr/bin/env python # Recursive downloader - 17 - recursedl.py import os, sys from ftplib import FTP, error_perm def walk_dir(f, dirpath): original_dir = f.pwd()

try: f.cwd(dirpath) except error_perm: return # ignore non-directories and ones we cannot enter print dirpath names = f.nlst() for name in names: walk_dir(f, dirpath + '/' + name) f.cwd(original_dir) # return to cwd of our caller

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bat file within the Solution Explorer and replace MyFeature with the name of your feature (in my case, ShareDocumentExample) Change the http://localhost to the site you want to use the workflow with After you save, then copy the folder to the server and run the bat file This installs the workflow DLL file in the GAC, and also performs the necessary associations and installs the feature Open the SharePoint site and click the Shared Documents link on the left Click Settings Document Library Settings Click Workflow Settings under the Permissions and Policies area If you haven t added a workflow before, you ll automatically come to the Add a Workflow form If you have workflows already defined in your SharePoint server, you ll need to click Add a Workflow first On the Add Workflow page, you ll see your workflow name at the top with other default workflows.

A methodology for determining good buy and sell prices for a stock comes from a technical analysis of the stock s trading envelope through the use of Bollinger bands. These bands are based on a calculation of the moving average of the stock the moving average being the average price of the stock over a number of periods preceding the current one. For example, a 30-day moving average on any day is the average of closing prices for the stock over the previous 30-day period. Thus, today s average will be slightly different from yesterday s, which is slightly different from the day before; hence, it is called a moving average.

f = FTP('ftp.kernel.org') f.login() walk_dir(f, '/pub/linux/kernel/Historic/old-versions') f.quit() This sample program will run a bit slow there are, it turns out, quite a few files in the old-versions directory on the Linux Kernel Archive but within a few dozen seconds, you should see the resulting directory tree displayed on the screen: $ python recursedl.py /pub/linux/kernel/Historic/old-versions /pub/linux/kernel/Historic/old-versions/impure /pub/linux/kernel/Historic/old-versions/old /pub/linux/kernel/Historic/old-versions/old/corrupt /pub/linux/kernel/Historic/old-versions/tytso By adding a few print statements, you could supplement this list of directories by displaying every one of the files that the recursive process is (slowly) discovering. And by adding another few lines of code, you could be downloading the files themselves to corresponding directories that you create locally. But the only really essential logic for a recursive download is already operating in Listing 17 9: the only foolproof way to know if an entry is a directory that you are allowed to enter is to try running cwd() against it.

Finally, FTP supports file deletion, and supports both the creation and deletion of directories. These more obscure calls are all described in the ftplib documentation: delete(filename) will delete a file from the server. mkd(dirname) attempts to create a new directory. rmd(dirname) will delete a directory; note that most systems require the directory to be empty first. rename(oldname, newname) works, essentially, like the Unix command mv: if both names are in the same directory, the file is essentially re-named; but if the destination specifies a name in a different directory, then the file is actually moved.

Bollinger bands are calculated from this value, with the upper band being the average over the preceding period plus two times the standard deviation and the lower band being the average over the preceding period minus two times the standard deviation. Figure 11-20, Figure 11-21, and Figure 11-22 show the price history overlaid with Bollinger bands for MSFT, GOOG, and SBUX.

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