> I don't know if I should be inheriting file or just using a file
> object.
> How would I determine which one would be more appropriate?
Inheritance is often refered to as an IS relation, whereas using an
attribute
is a HAS relation.
If you inherit from file, all operations for files should be valif for
your
class also. Usually the file-operations would be directly inherited and
not
overwritten.
However, if you don't want to expose all file functionalities, a HAS
relation
is more appropriate. if you plan to use your class as a file handle,
e.g. for
formatting output in a special way, I woould prefer to make the file an
attribute:
class myFile :
def __init__(self,fname,mode="r") :
self.file = file(fname,mode)
def write_formatted(self,string) :
# format string
self.file.write()
If you would tell as your use case, it would be easier to give you an
advice.
- harold -
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