Leif K-Brooks <eurleif at ecritters.biz> wrote in
news:QjV2c.302$_43.225384 at newshog.newsread.com:
> In any case, I did a quick Python implementation of the show function. > All bugs are features. :-)> > import sys> > def show(*objects, **parameters):> seperator = parameters.get('seperator', ' ')> trailer = parameters.get('trailer', '\n')> to = parameters.get('to', sys.stdout)> first = 1> for object in objects:> if not first:> to.write(str(seperator))> to.write(str(object))> first = 0> to.write(str(trailer))> if len(objects) == 1:> return objects> else:> return objects>
You need a bit more checking to be sure nobody tried to pass in any
unexpected keyword arguments, and your output loop is a bit messy.
def show(*args, **kw):
separator = kw.get('separator', ' ')
trailer = kw.get('trailer', '\n')
to = kw.get('to', sys.stdout)
for keyword in kw:
if not keyword in ('separator', 'trailer', 'to'):
'show() got an unexpected keyword argument' + keyword)
to.write(separator.join([ str(arg) for arg in args]))
Things wrong with the proposal:
The arguments that this function accepts don't follow the pattern of any
other Python functions, so we need 6 lines of code just to unscramble them.
This should be a big red warning flag: don't go that way.
The 4 lines of code to work out the result are another red flag warning
that the result is going to cause confusion for users.
The real work of the function can be replaced by 2 lines of code, or 1 if
you don't mind copying the output string an extra time. So the penalty is
to add an inconsistent function to the language that everyone has to learn
in return for replacing one line of code with a (possibly) shorter line of
If you need this, then just hardwire your separator and terminator and
write a custom one line function for each different style of output.
Personally I think I'll stick to using format strings.