Basic Threading and Queueing

Happy 2015! Nothing like a fresh smell of Python script in the morning! :)

I wanted to get more practice on Threading and Queueing. So I went to my favorite site to look at standard library, Python Module of the Week, to look at some usage examples.

http://pymotw.com/2/threading/index.html#module-threading
http://pymotw.com/2/Queue/index.html#module-Queue

Here is the result:

#
# eric@pythonicneteng.com
# Reference: Python Module of the Week http://pymotw.com/
#

# Threading: http://pymotw.com/2/threading/index.html#module-threading
# Queue: http://pymotw.com/2/Queue/index.html#module-Queue

##########
# Step 1
# Basic Thread usage
import threading

def workers():
""" thread worker function """
print "hello "
return

thread = []
for i in range(5):
print "Thread " + str(i)
t = threading.Thread(target=workers)
thread.append(t)
t.start()
##########

##########
# Step 2
# Basic Queue usage
import Queue

q = Queue.Queue()

for i in range(5):
print "Putting item in Queu: " + str(i)
q.put(i)

while not q.empty():
print "Getting Queue"
print q.get()
##########

##########
# Step 3
# Combine Queue and Threading
switches = ["switch1", "switch2", "switch3"]

switchQueue = Queue.Queue()
for switch in switches:
print "Putting switches %s in Quque" % switch
switchQueue.put(switch)

def switchWorker(switch):
print "Working on: " + switch
return

print "\r\nStart to work on switches: "
threads = []
for switch in switches:
t = threading.Thread(target=switchWorker, args=(switch,))
thread.append(t)
t.start()

print "Done!\r\n"
##########

Here is the output of the script:

$python threadingPractice.py
Thread 0
hello
Thread 1
hello
Thread 2
hello
Thread 3
hello
Thread 4
hello
Putting item in Queu: 0
Putting item in Queu: 1
Putting item in Queu: 2
Putting item in Queu: 3
Putting item in Queu: 4
Getting Queue
0
Getting Queue
1
Getting Queue
2
Getting Queue
3
Getting Queue
4
Putting switches switch1 in Quque
Putting switches switch2 in Quque
Putting switches switch3 in Quque

Start to work on switches:
Working on: switch1
Working on: switch2
Working on: switch3
Done!

$

Happy Coding!