Sympy_intro
# countdown.py
#
# A simple generator function
def countdown(n):
print "Counting down from", n
while n > 0:
yield n
n -= 1
print "Done counting down"
# Example use
if __name__ == '__main__':
for i in countdown(10):
print i
int function(void) { int i; for (i = 0; i < 10; i++) return i; /* won't work, but wouldn't it be nice */ }
def gen(header, footer):
yield header
for thing in q:
yield thing
yield footer
q = [1, 2, 3, 4]
for tmp in gen('something','anything'):
print(tmp)
===============================
/usr/bin/python -u "/home/barnix2/py/simpy/coroutine3"
something
1
2
3
4
anything
from __future__ import generators # Python 2.2 only
from SimPy.Simulation import *
from random import uniform
class Car(Process):
def __init__(self,id):
Process.__init__(self)
self.id=id
def carDriving(self,driveTime):
# the Process Execution Method (generator)
print "%5.1f %s started" %(now(),self.id)
yield hold,self,driveTime
print "%5.1f %s arrived" %(now(),self.id)
initialize()
nrCars=10
for i in range(nrCars):
c=Car(id="Car %s" %i)
activate(c,c.carDriving(driveTime=uniform(1,90)))
simulate(until=100)
from __future__ import generators
from SimPy.Simulation import *
from random import uniform
# Python 2.2 only
class Car(Process):
def __init__(self,id):
Process.__init__(self)
self.id=id
def carParking(self,driveTime,parkTime): # the PEM
yield hold,self,driveTime
yield request,self,parkingLot
# begin Mutex section
print "%5.1f %s gets space" %(now(),self.id)
yield hold,self,parkTime
print "%5.1f %s releases space" %(now(),self.id)
yield release,self,parkingLot
# end Mutex section
nrCars=10
initialize()
parkingLot=Resource(capacity=4,qType=FIFO)
for i in range(nrCars):
c=Car(id="Car %s" %i)
activate(c,c.carParking(driveTime=10,parkTime=uniform(5,20)))
simulate(until=100)
