"Steven D'Aprano" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
Just throwing a suggestion out there...
def atomic(obj, _atomic=(basestring,)):
try:
return bool(obj.__atomic__)
except AttributeError:
if isinstance(obj, _atomic):
return True
else:
try:
iter(obj)
except TypeError:
return True
return False
assert atomic("abc")
assert not atomic(['a', 'b', 'c'])
If built-in objects grew an __atomic__ attribute, you could simplify the
atomic() function greatly:
def atomic(obj):
return bool(obj.__atomic__)
However atomic() is defined, now flatten() is easy:
def flatten(obj):
if atomic(obj):
yield obj
else:
for item in obj:
for i in flatten(item):
yield i
If you needed more control, you could customise it using standard
techniques e.g. shadow the atomic() function with your own version,
sub-class the types you wish to treat differently, make __atomic__ a
computed property instead of a simple attribute, etc.
==================
This is a lot of work to avoid being explicit about either atomic or
non-atomic classes on an site, package, module, or call basis ;-)
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