Hi all,
Below is a basic threading program. The basic I idea is that I have a
function which needs to be run using a queue of data. Early on I
specified my function needed to only accept basic parameters ( no
postional *args or *kwargs ) but now I am re-writing it and I want to
accept these. Is there anyway to determine what parameters are needed
by a given function and format the arguments given appropriately. My
problem is that I feel my "Kludge"section is just that - a kludge.
While it works for most cases it won't work for all (Try running this
on function4 for example...). I guess I have a problem with multiple
if statements and I think it should just look to see what parameters
are accepted and format them appropriately. Thoughts?
If I am really screwing this up - please help me get back on the right
track. I appreciate all of the help I get and it's great to learn from
the experts.
import random
import threading
import Queue
class WorkerB(threading.Thread):
def __init__(self, *args, **kwargs):
self.id = kwargs.get('id', 0)
self.requestQ = kwargs.get('requestQ', None)
self.function = kwargs.get('function', None)
threading.Thread.__init__(self, name=self.__class__.__name__
+"."+str(self.id))
def run(self):
while 1:
input = self.requestQ.get()
if input is None: break
# How do I look at the function and determine what it
requires then apply that as an input?
# -------- Start Kludge ----------
tu=dic=False
if isinstance(input, tuple):
try:
if isinstance(input[0], tuple): tu = True
elif isinstance(input[0], list): tu=True
except: pass
try:
if isinstance(input[1], dict):dic = True
except: pass
if tu and dic:
print " -Tuple and list found"
result = self.function(*input[0], **input[1])
elif tu and not dic:
print " -Tuple found"
result = self.function(*input[0])
elif isinstance(input, list):
print " -list only found"
result = self.function(*input)
else:
print " -Unknown"
result = self.function(input)
# -------- End Kludge ----------
def function1(arg1):
print arg1
def function2(*a ):
print "args", a
def function3(*a, **kw):
print "args", a
print "kwargs", kw
def function4(arg1, *a, **kw):
print arg1
print "args", a
print "kwargs", kw
def main():
lod = 2
myQ=Queue.Queue()
# A basic example
print "\n== Example 1"
for x in range(lod):myQ.put( random.random() )
myQ.put(None)
a=WorkerB(requestQ=myQ, function=function1).start()
# Throw at is some args
print "\n== Example 2"
for x in range(lod):myQ.put(["a","b","c"])
myQ.put(None)
a=WorkerB(requestQ=myQ, function=function2).start()
# Throw at it both args and kwargs
print "\n== Example 3"
for x in range(lod):myQ.put(((1,2,3),
{"input":random.random(),"loglevel":10}))
myQ.put(None)
a=WorkerB(requestQ=myQ, function=function3).start()
# Throw at it both args and kwargs
print "\n== Example 4 Does nothing!!"
for x in range(lod):myQ.put(("alpha",(1,2,3),
{"input":random.random(),"loglevel":10}))
myQ.put(None)
a=WorkerB(requestQ=myQ, function=function4).start()
if __name__ == '__main__':
main()
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