John Dann wrote:
Let's say I define the class in a module called comms.py. The class
isn't really going to inherit from any other class (except presumably
in the most primitive base-class sense, which is presumably automatic
and implicit in using the class keyword). Let's call the class
serial_link. So in comms.py I have:
If you on only ever going to have 1 serial link, you could put all
functions in the module. But the class allows for multiple links in
some future usage.
class serial_link:
Recommended for class names would be SerialLink, I believe (see PEP 8)
but at least a cap for the initial letter of python-defined classes.
def __init__(self):
Try
Import serial # the pyserial library
Except ImportException
#Error handling
The import should be at module level. You only want to do it once, not
for every link. And if the import fails, you should find out right
away. You perhaps should move try/except into the importing module. Or
re-raise the exception. Either way, the import of this module should
fail if it cannot get serial.
def openPort(self):
Try
#Code to try opening serial port
Return "Success"
Except SerialException
Return "Failure"
I would either move this to __init__ or call it from there (but the
latter only if you expect to close and reopen ports.
Then in my separate main calling module I might have:
Import comms
I guess you learned by now why cut/paste/edit-down is superior to
re-typing ;-)
serlink=comms.seral_link
....()
#Create instance of serial_link class
print serlink.openPort
....()
Terry Jan Reedy
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