I'm stumped on a python problem. I'm writing a program that receives a command from Scratch (MIT) and then should create a new object, in this case named PiLight. The object only need to be created when the command is received so it doesn't have to loop, just be able to executed repeatedly and have the number increment each time it is executed.A list will not work for me due to the requirements of the program and talking between Scratch. I'm trying to figure out a way for the constructor, once initialized, to print out a statement something like
class Newpilight:
def __init__(self):
print "Pilight" + pilnumber + " created"
pilnumber should be 1 for 1st object, 2 for 2nd, etc
From there I need the creation of the object to change the number in the name of the object as well
PiLight(PiLnumber) = Newpilight()
I tried messing around with for loops but just ended up making more of a mess
from itertools import count
class NewPilight(object):
nums = count()
def __init__(self):
self.num = self.nums.next()
print "Pilight {self.num} created".format(self=self)
Then using in code:
>>> pl1 = NewPilight()
Pilight 0 created
>>> pl2 = NewPilight()
Pilight 1 created
>>> pl3 = NewPilight()
Pilight 2 created
>>> pl3.num
2
The trick is to have the nums
(what is actually a generator of numbers, not list of numbers) as class property and not property of class instance. This way it is globally shared by all class instances.
class NewPilight:
def __init__(self, number):
self.number = number
print "Pilight" + number + " created"
for x in range(5):
NewPilight(x)
if you need to keep objects:
all_pilights = []
for x in range(5):
all_pilights.append( NewPilight(x) )
and now you have access to objects as
print all_pilights[0].number
print all_pilights[1].number
print all_pilights[2].number
class NewPiLight(object):
global_pilnumber = 0 # Since this is on the class definition, it is static
def __init__(self):
print "Pilight %s created" % NewPiLight.global_pilnumber
self.pilnumber = NewPiLight.global_pilnumber # Set the variable for this instance
NewPiLight.global_pilnumber += 1 # This increments the static variable
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