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In some situations we already have programs that have the functionality we need but we want to automate their use We can do this by using Python s subprocess module which provides facilities for running other programs, passing any command-line options we want, and if desired, communicating with them using pipes We saw one very simple example of this in 5 when we used the subprocesscall() function to clear the console in a platform-speci c way But we can also use these facilities to create pairs of parent child programs, where the parent program is run by the user and this in turn runs as many instances of the child program as necessary, each with different work to do It is this approach that we will cover in this section In 3 we showed a very simple program, grepwordpy, that searches for a word speci ed on the command line in the les listed after the word In this section we will develop a more sophisticated version that can recurse into subdirectories to nd les to read and that can delegate the work to as many separate child processes as we like The output is just a list of lenames (with paths) for those les that contain the speci ed search word The parent program is grepword-ppy and the child program is grepword-pchildpy The relationship between the two programs when they are being run is shown schematically in Figure 101 The heart of grepword-ppy is encapsulated by its main() function, which we will look at in three parts:

def main(): child = ospathjoin(ospathdirname(__file__), "grepword-p-childpy") opts, word, args = parse_options() filelist = get_files(args, optsrecurse) files_per_process = len(filelist) // optscount start, end = 0, files_per_process + (len(filelist) % optscount) number = 1

public class SharedQueue1 { class Node //inner class defines list nodes { Object task; Node next; Node(Object task) {thistask = task; next = null;} } private Node head = new Node(null); //dummy node private Node last = head; public synchronized void put(Object task) { assert task != null: "Cannot insert null task"; Node p = new Node(task); lastnext = p; last = p; } public synchronized Object take() { //returns first task in queue or null if queue is empty Object task = null; if (!isEmpty()) { Node first = headnext; task = firsttask; firsttask = null; head = first; } return task; } private boolean isEmpty(){return headnext == null;} }

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ALTER TABLE dbotbl_customer WITH CHECK ADD CONSTRAINT CK_phone_number CHECK (([homephone] IS NOT NULL OR [workphone] IS NOT NULL OR [mobilephone] IS NOT NULL))

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In general, to change a method that returns immediately if a condition is false to one that waits until the condition is true, two changes need to be made: First, we replace a statement of the form

We begin by getting the name of the child program Then we get the user s command-line options The parse_options() function uses the optparse module It returns the opts named tuple which indicates whether the program should recurse into subdirectories and the count of how many processes to use the default is 7, and the program has an arbitrarily chosen maximum of 20 It also returns the word to search for and the list of names ( lenames and directory names) given on the command line The get_files() function returns a list of les to be read Once we have the information necessary to perform the task we calculate how many les must be given to each process to work on The start and end variables are used to specify the slice of the filelist that will be given to the next child process to work on Usually the number of les won t be an exact multiple of the number of processes, so we increase the number of les the rst process is given by the remainder The number variable is used purely for debugging so that we can see which process produced each line of output

pipes = [] while start < len(filelist): command = [sysexecutable, child] if optsdebug: commandappend(str(number)) pipe = subprocessPopen(command, stdin=subprocessPIPE) pipesappend(pipe) pipestdinwrite(wordencode("utf8") + b"\n") for filename in filelist[start:end]: pipestdinwrite(filenameencode("utf8") + b"\n") pipestdinclose() number += 1 start, end = end, end + files_per_process

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if (condition){do_something;}

For each start:end slice of the filelist we create a command list consisting of the Python interpreter (conveniently available in sysexecutable), the child program we want Python to execute, and the command-line options in this case just the child number if we are debugging If the child program has a suitable shebang line or le association we could list it rst and not bother including

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