Jimbo <nill...@yahoo.com> wrote:
>
>class stock:
> code = ""
> purchasePrice = 0
> purchaseQuantity = 0
> price = [] # list of recent prices
> recentBid = [] # list of recent bids for stock
> recentOffer = [] # list of recent offers for stock
> stockVol = [] # list of stock quantity available on
>market
Using lists as class variables is a very good way to create very surprising
bugs. Consider the following:
C:\Dev>type x.py
class test:
check = []
def __init__(self):
self.check.append(1)
x = test()
y = test()
z = test()
print x.check
print y.check
print z.check
C:\Dev>x.py
[1, 1, 1]
[1, 1, 1]
[1, 1, 1]
C:\Dev>
> def __init__(self):
> """ Default Constructor """
> self.code = ""
> self.purchasePrice = 0
> self.purchaseQuantity = 0
>
> def constructor(self, stockCode, purPrice, purQuant):
> """ Constructor """
> self.code = stockCode
> self.purchasePrice = purPrice
> self.purchaseQuantity = purQuant
The "constructor" concept here is not very Pythonic. Why not replace those
both with:
def __init__(self, stockCode="", purPrice=0, purQuant=0):
self.code = stockCode
self.purchasePrice = purPrice
self.purchaseQuantity = purQuant
--
Tim Roberts, t...@probo.com
Providenza & Boekelheide, Inc.
--
http://mail.python.org/mailman/listinfo/python-list
