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static methods, overloaded operator, propertys, inheritance and polymorphism ...
Objects - Intermediate example from a Well House Consultants training course
More on Objects - Intermediate [link]
Source code: travel.py Module: Y112
""" This is a Python demonstration written during a training course to show many of the features of Pythn classes ... follow the link above to find further details""" class pub(object): """Here is the stuff about the classi (base class,public transport)""" def __init__(current,leave,mins,peep,d): current.deptt = leave current.passengers = peep current.destiny = d current.mins = mins # object variable pub.count += 1 # shared (class) variable def gettotime(current): return current.mins*current.passengers def getdestiny(current): return current.destiny def compare(this,that): t1 = this.gettotime() t2 = that.gettotime() if t1 < t2: return that return this @staticmethod def highest(those): so_far = those[0] for perhaps in those[1:]: so_far = so_far.compare(perhaps) return so_far def setlv(this,etc): pass def getlv(this): return this.deptt dept = property(getlv,setlv) def __cmp__(two,one): return one.gettotime() - two.gettotime() # precedence to __lt__ and five friends def __lt__(two,one): return one.gettotime() - two.gettotime() def __str__(this): itsa = this.__class__.__name__ itsa += " to " + this.destiny return itsa # slightly different algortithms for ferry, train and plane class ferry(pub): def wotsit(this): return "It's a ferry boat" class train(pub): def __init__(current,leave,mins,peep,d,lenny): super(train,current).__init__(leave,mins,peep * lenny, d) current.numcars = lenny def wotsit(this): return "It's a chuff chuff" class plane(pub): def gettotime(current): return (current.mins-12)*current.passengers def wotsit(this): return "It's an aircraft" pub.count = 0 # Sort callback function - in module but not in class def leaveorder(tom,jerry): print tom,"v", jerry return cmp (tom.deptt, jerry.deptt) if __name__ == "__main__": roscoff = ferry("23:00",8 * 60,1000,"Brittany") newq = train("07:00",84,75,"Newquay",2) dundee = train("04:00",10 * 60,70,"Dundee",5) dublin = plane("10:00",90,60,"Dublin") options = [roscoff, newq, dundee, dublin] for opt in options: soppy1 = opt.gettotime() goingto = opt.getdestiny() what = opt.wotsit() print goingto,", minutes of selling: ",soppy1,what,opt.dept print "Number defined: ",pub.count answer = dublin.compare(dundee) print "Higher opportunity is to",answer.getdestiny() answer = pub.highest(options) print "Highest opportunity is to",answer.getdestiny() print pub.__doc__ # Sort in the natural (flog it!) way print "------------"; options.sort() for opt in options: soppy1 = opt.gettotime() goingto = opt.getdestiny() print goingto, soppy1, opt.deptt # Sort by departure time print "------------"; options.sort(leaveorder) for opt in options: soppy1 = opt.gettotime() goingto = opt.getdestiny() print goingto, soppy1, opt.deptt if dublin < dundee: print "Ireland wins" else: print "The Scots have it" Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Python * Python Programming * Intermediate Python Also available on on site courses for larger groups Books covering this topic
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