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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

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checking hosts in parallel threads
Threads - What why and how example from a Well House Consultants training course
More on Threads - What why and how [link]

This example is described in the following article(s):
   • Pieces of Python - [link]
   • Parallel Pinging, using Python Threads or Expect spawn lists - [link]

Source code: kicking Module: Y302
import os
import re
import time
import sys
from threading import Thread

class testit(Thread):
   def __init__ (self,ip):
      Thread.__init__(self)
      self.ip = ip
      self.status = -1
   def run(self):

""" This function runs individual and parallel pings.
      Since ping is implemented differently on different
      versions of Linux and Unix, you may need to change
      your ping options and the regular expression that it
      matches to get the correct results """


      pingaling = os.popen("ping -q -c2 "+self.ip,"r")
      # This code is what each parallel thread does
      # the 'run' method is triggered when 'start' is called
      while 1:
        line = pingaling.readline()
        if not line: break
        igot = re.findall(testit.lifeline,line)
        if igot:
           self.status = int(igot[0])

testit.lifeline = re.compile(r"(\d) received")
report = ("No response","Partial Response","Alive")

print time.ctime()

pinglist = []

for host in range(60,70):
   ip = "192.168.200."+str(host)
   # create a thread, add it to a thread list
   current = testit(ip)
   pinglist.append(current)
   # start the thread running
   current.start()

for pingle in pinglist:
   # await the completion of each thread in turn
   pingle.join()
   print "Status from ",pingle.ip,"is",report[pingle.status]

print time.ctime()
Learn about this subject
This module and example are covered on our public Intermediate Python course. If you have a group of three or more trainees who need to learn the subject, we can also arrange a private or on site course for you.

Books covering this topic
Yes. We have over 700 books in our library. Books covering Python are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Threads - What why and how" training module. You'll find a description of the topic and some other closely related examples on the "Threads - What why and how" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
• Our Opentalk forum archive provides a question and answer centre.
The Horse's mouth provides a daily tip or thought.
• Further resources are available via the resources centre.
• All of these resources can be searched through through our search engine
• And there's a global index here.

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This web site is written and maintained by Well House Consultants.

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This is a sample program, class demonstration or answer from a training course. It's main purpose is to provide an after-course service to customers who have attended our public private or on site courses, but the examples are made generally available under conditions described below.

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Past attendees on our training courses are welcome to use individual examples in the course of their programming, but must check the examples they use to ensure that they are suitable for their job. Remember that some of our examples show you how not to do things - check in your notes. Well House Consultants take no responsibility for the suitability of these example programs to customer's needs.

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