On Aug 9, 12:00 pm, Irish <[EMAIL PROTECTED]> wrote:
> Hey everybody!
Firstly, welcome to Python, and Turbogears! Python's a great language,
in addition to being a great language to start in.
> def worldbuilder(xspan, yspan):
> for ycoord in range(yspan):
> print ycoord
> for xcoord in range(xspan):
> print xcoord
> BuildingLot=(xcoord, ycoord)
>
> and I'm calling it by using the tg-admin toolbox, in the WebConsole by
> typing:
>
> >>> from controllers import *
> >>> worldbuilder(xspan=2, yspan=8)
I can't reproduce this (I haven't tried in tg-admin, since there are
problems you need to address before even getting that far...)
A major problem with what you are doing here lies in the last line.
You are not creating a new BuildingLot instance, but rather
reassigning the name BuildingLot to the tuple (xcoord, ycoord). That
is, BuildingLot no longer refers to the class in your model - it now
points at the last tuple built - in the first iteration (0, 0).
In general, new objects are created using parentheses: Address("Bob",
"112 Dingo Way") for example. in the specific case of your class, it
subclasses SQLObject and provides no constructor of itself (i.e. a
method called __init__ of the class), and so you need to pass in
values to the constructor as key-value pairs:
buildingLot = BuildingLot(xcoord=xcoord, ycoord=ycoord)
It would be worth spending a bit of time in the Python console (the tg-
admin shell woould be fine) and try playing with classes to see how
they work. For example:
>>> class Test(object):
... pass
...
>>> x = Test()
>>> x = Test(1,2)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: default __new__ takes no parameters
>>> class Test(object):
... def __init__(self, x, y):
... self.x = x
... self.y = y
...
>>> def printxy(obj):
... print "X:", obj.x, "Y:", obj.y
...
>>> printxy(Test())
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: __init__() takes exactly 3 arguments (1 given)
>>> printxy(Test(1,2))
X: 1 Y: 2
>>> printxy(Test(y=1,x=2))
X: 2 Y: 1
>>>
It will give you a better understanding of how it all hangs together.
Cheers,
--
Ant...
http://antroy.blogspot.com/
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