Data sticking around too long

[CedricCicada at gmail.com]

Greetings again!

There's something more to determining whether a class member is a class
variable or an instance variable.  Here's a slightly expanded version
of my last script:

class ScannerCommand:
    taskName = ''
    scanList = []
    number = 0

    def __init__(self, data):
        pass
#        self.scanList = []
#        self.scanList.append(data)

if __name__ == '__main__':
    c1 = ScannerCommand("c1")
    c2 = ScannerCommand("c2")
    c1.number = 1
    c2.number = 2
    c1.scanList.append("One")
    c2.scanList.append("Two")
    print "C1: " + str(c1.number)
    for data in c1.scanList:
        print "   " + data
    print "C2: " + str(c2.number)
    for data in c2.scanList:
        print "   " + data

And here's the output:
C1: 1
   One
   Two
C2: 2
   One
   Two

Here, the two instances share the scanList list, as expected from
previous discussions, but they have their own copies of the number
variable.  Why is scanList a class variable but number an instance
variable here?

Good night, all!

Rob Richardson
RAD-CON, Inc.
Bay Village, OH