sparkle Plenty wrote:
> On Wed, Apr 24, 2013 at 4:21 PM, Prasad, Ramit <ramit.pra...@jpmorgan.com>
> wrote:
[snip]
> >
> > Here is my function as it stands now:
> >
> > def conCatNumbers(numOne, numTwo, numThree):
> > global instanceGroup, lengthCounter, instanceCounter
> > print("Pre Pack: ", numOne, " ", numTwo, " ", numThree)
> > packValues = struct.pack("HBB", numOne, numTwo, numThree)
> > print("Post Pack: ", packValues)
> > instanceValues = (packValues, )
> > print(instanceValues)
> > instanceGroup = (instanceGroup, )
> > instanceGroup = instanceGroup + instanceValues
> > lengthCounter += 4
> > instanceCounter += 1
> > return (instanceGroup, lengthCounter, instanceCounter)
> >
[snip]
> >>> blah = []
> >>> def foo():
> ... instanceValues = '\x04\xd2\x01\x00'
> ... blah.append( instanceValues ) # module level object can be mutated
> without global keyword,
> # just not reassigned (name binding).
> ... print blah
> ...
[snip]
> ~Ramit
>
> Thank you so much! I knew the Global statement was a cop-out, but I was
> frustrated with the endless
> Unbounded Local Variable errors, and getting a little wild-eyed and desperate
> as my project deadline
> approaches. I will implement the changes you suggested, and then retest.
Note that the above example is still using a global variable (actually a module
level).
You can eliminate it by just passing in the list as well.
def pack_without_globals(lst, numOne, numTwo, numThree):
'''Pack values into hex bytes and append to lst.
'''
packValues = struct.pack("HBB", numOne, numTwo, numThree)
lst.append( packValues )
# No need to return lst because it is modified in place and the calling
function should
# have access to the object anyway.
>
> I have also searched the Tutor archives quite a lot, and noted a number of
> websites that I will
> peruse for another online course (I have taken the one at Python.org) so I
> can review class and
> function best practices. It is great to have someone to ask when I get stuck.
That is the purpose of this list. :)
~Ramit
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