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Decorator, lots of __ methods, formatting, and more
this example from a Well House Consultants training course
Source code: extend.py Module: Y050
# Decorator, lots of __ methods, formatting, and more
class parrot(object): def __init__(self,val=1): self.number = val def __add__(this, that): newbird = parrot(this.number + that) return newbird def __iadd__(this, that): this.number += that return this def __str__(this): return str(this.number) + " [user format]" def __repr__(this): return str(this.number) + " [dump / geek format]" def identity(what): myname = what.func_name # A do-nothing decorator for illustration def wrapped(*args, **kwargs): finalanswer = what(*args, **kwargs) return finalanswer wrapped.__doc__ = what.__doc__ return wrapped def logger(what): try: # print what # next line to be resolved myname = what.getclass() + "/" + what.func_name except: myname = "//" + what.func_name def wrapped(*args, **kwargs): finalanswer = what(*args, **kwargs) try: covercount[myname] += 1 except: covercount[myname] = parrot() return finalanswer wrapped.__doc__ = what.__doc__ return wrapped covercount = {} class table(object): @logger def getmaterial(self): return self.mat @logger def __init__(self,material): self.mat = material print "HELLO!" def __str__(self): return "A Fancy table type " + self.__class__.__name__ def __format__(this,fs): return this.mat.swapcase() @staticmethod @logger def factory(source): bits = source.split(" ") if bits[0] == "Circular": rv = circtable(float(bits[2]),bits[1]) elif bits[0] == "Rectangular": rv = recttable(float(bits[2]),float(bits[3]),bits[1]) else: rv = None return rv def getmaxdim(this): return int(this.maxdim) def setmaxdim(this,nooval): print "STOP MESSIN ABOUT" this.maxdim = nooval largest_size = property(getmaxdim,setmaxdim) class recttable(table): @logger def __init__(current,w,h,material): super(recttable,current).__init__(material) current.w = w current.h = h current.maxdim = current.h if current.h < current.w: current.maxdim = current.w current.cached = False @logger def getseats(current): "Work out how many people can eat dinner around the table easily" if current.cached: return current.canseat elbows = 850 current.canseat = (int (current.w / elbows) + int(current.h / elbows)) * 2 current.cached = True return current.canseat @logger def islonglegs(self): minlegs = 1100 if self.w < minlegs or self.h < minlegs: return False return True @logger def __str__(self): rv = "Rectangular table " + str(self.w) + " by " + str(self.h) return rv class circtable(table): @logger def __init__(current,d,material): current.mat = material current.d = d current.maxdim = current.d @logger def getseats(current): "Work out how many people can eat dinner around the table easily" elbows = 850 s = int (current.d * 3.14159265 / elbows) return s @logger def islonglegs(self): minlegs = 1100 if self.d < minlegs: return False return True # ----------------------------------------------------------- if __name__ == "__main__": demo = recttable(1000,3000,"wood") another = recttable(2000,4500,"plastic") arthur = circtable(1900,"glass") refline ="Circular timber 1780" filetable = table.factory(refline) lot = [demo,another,arthur,filetable] for tab in lot: s1 = tab.getseats() s2 = tab.getmaterial() if tab.islonglegs(): print "Michael can sit at this table" else: print "Michael will be scrunched up" print "{0.largest_size:6b}".format(tab) tab.largest_size = 4444 tops = tab.largest_size # print s1,s2,tab,tops print "%3d %12s %30s %6d" % (s1,s2,tab,tops) print "{:3d} {:12s} {:30s} {:6d}".format(s1,s2,tab,tops) print "{0:3d} {0:3x} {2:^12s} {1:30s} {3:6d}".format(s1,tab,s2,tops) print "{} !".format(tab) print covercount print covercount["//getmaterial"] Learn about this subject
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