PythonNotes

CloseThreads.py

# http://stackoverflow.com/a/18416308

from threading import Thread
import time

class MyClass(Thread):
    def __init__(self, name):
        super(MyClass, self).__init__()
        #self.daemon = True
        self.cancelled = False
        self.name = name

    def run(self):
        while not self.cancelled:
            self.update()
            time.sleep(1)

    def cancel(self):
        """End this timer thread"""
        self.cancelled = True

    # main thread loop
    def update(self):
        """Update the counters"""
        print self.name+"\n"
        #pass

threadList = []

# start new thread
thread1 = MyClass("Thread#1")
thread1.start()

# take it to list
threadList.append(thread1)

# start new thread
thread2 = MyClass("Thread#2")
thread2.start()

# take it to list
threadList.append(thread2)


# MAIN LOOP
while True:
    try:
        print "--MAINTHREAD--\n"
        time.sleep(1)
    except KeyboardInterrupt: #close on ctrl+c
        for t in threadList:
            t.cancel()
        break

print "*** FINISHED ***"
        

pythonnotes.py

# get ip address of this pc
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(("google.com",80))
myIP = s.getsockname()[0]
print myIP
s.close()

#print to same line, add comma
print 'a',

# iterate numpy array
for x in np.nditer(A):
    print x,
    
# int to bytes
b = bytes(chr(random.randint(0,255)))

# use global variable inside class
myvar=100
class ...
    global myvar
    print myvar #100
    
# using ATOM editor/ide
- install atom
- install packages "script" and "python python-tools" (optional)
- if script plugin cannot find python to run, add python folder to Windows PATH enviroment variable
- Run script from Packages/Scripts/Run script


# join?
A = 'asdf'
B = 123
server_address = (A, B)

# clamp
numpy.clip(val,min,max)

# exit with ctrl+c
    while True:
        try:
            print "--loop--\n"
            time.sleep(1)
        except KeyboardInterrupt:
            print "bye"
            sys.exit()
            
            
# for loop with custom step : https://wiki.python.org/moin/ForLoop

def my_range(start, end, step):
    while start <= end:
        yield start
        start += step

for x in my_range(1, 10, 0.5):
    print x
    
# check if object in list, remove if yes
if thing in some_list: some_list.remove(thing)

# check if list contains
if myItem in list:
    # do something
    
# stock blocking socket connection wait function
#socket.shutdown(socket.SHUT_WR) # doesnt work
# or http://stackoverflow.com/a/10090348 # doesnt work
# works, connect to it, then close
http://stackoverflow.com/a/16736227

# init dictionary
dictionary = {}
# add item
dictionary['key'] = "value"