gist是个很有意思的github子产品，可谓之程序员的twitter，我前面文章中找的很多关于树莓派的资源，都来源于gist。在gist上分享自己的代码片段，是件有趣的事情，不知大家有哪些好玩的代码来分享一下？我在这里先抛砖引玉吧，分享一段我对命令模式的理解（python版），gist上链接请移步这里。
class Vehicle(object):
"""docstring for Vehicle"""
def __init__(self):
self.name = 'vehicle'
def __call__(self):
print "travelling by a Vehicle"
def execute(self):
self()
class Bus(Vehicle):
"""docstring for Bus"""
def __init__(self):
super(Vehicle, self).__init__()
self.name = 'bus'
def __call__(self):
print 'travelling by bus'
def execute(self):
self()
class Bike(Vehicle):
"""docstring for Bike"""
def __init__(self):
super(Vehicle, self).__init__()
self.name = 'bike'
def __call__(self):
print 'travelling by bike'
def execute(self):
self()
class Car(Vehicle):
"""docstring for Car"""
def __init__(self):
super(Vehicle, self).__init__()
self.name = 'car'
def __call__(self):
print 'travelling by car'
def execute(self):
self()
class Rocket(Vehicle):
"""docstring for Rocket"""
def __init__(self):
super(Vehicle, self).__init__()
self.name = 'rocket'
def __call__(self):
print 'travelling by rocket'
def execute(self):
self()
class Traveller(object):
"""docstring for Traveller"""
def __init__(self, name):
self.name = name
def set_vehicle(self, vehicle):
self.vehicle = vehicle
def travel(self):
self.vehicle.execute()
def main():
# create a traveller
tom = Traveller('tom')
print 'stop 1:'
# traveller's first vehicle
vehicle = Bus()
tom.set_vehicle(vehicle)
tom.travel()
print 'stop 2:'
# traveller's second vehicle
vehicle = Bike()
tom.set_vehicle(vehicle)
tom.travel()
print 'stop 3:'
# traveller's third vehicle
vehicle = Car()
tom.set_vehicle(vehicle)
tom.travel()
print 'stop 4:'
# traveller's fourth vehicle
vehicle = Rocket()
tom.set_vehicle(vehicle)
tom.travel()
if __name__ == '__main__':
main()
### OUTPUT ###
# stop 1:
# travelling by bus
# stop 2:
# travelling by bike
# stop 3:
# travelling by car
# stop 4:
# travelling by rocket
