On Fri, 10 May 2013, Gregory Ewing wrote:
Wayne Werner wrote:
You don't ever want a class that has functions that need to be called in a
certain order to *not* crash.
That seems like an overly broad statement. What
do you think the following should do?
f = open("myfile.dat")
f.close()
data = f.read()
To clarify - you don't want a class that has functions that need to be
called in a certain order with *valid input* in order to not crash.
Exactly what does happen - a ValueError is raised because you're(*)
passing self into the file.read() function, and that input is invalid
input - specifically:
ValueError: I/O operation on closed file
*where you actually means python, because when you call
`your_instance.method()`, it works effectively like a call to
`YourClass.method(your_instance)`
-W
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