any macro-like construct/technique/trick?

[Mac]

Is there a way to mimic the behaviour of C/C++'s preprocessor for
macros?  The problem: a lot of code like this:

def foo():
    # .... do some stuff
    if debug:
        emit_dbg_obj(DbgObjFoo(a,b,c))

    # .... do more stuff
    if debug:
        emit_dbg_obj(DbgObjBar(d,e))

    # ... and so on ...

Notes:

* the two-lines of debug conditional tend to really break up the flow
of the surrounding code

* in C you could wrap them with a macro so you could do
DEBUG_EMIT(DbgObjFoo(a,b,c)), etc, with the macro only instantiating
the object and processing it if the debug flag was set.  The one-liner
is MUCH less disruptive visually when reading code

* using
   def debug_emit(obj):
       if debug:
           emit_dbg_obj(obj)
is a poor solution, because it *always* instantiates DbgObj*, even when
not needed; I want to avoid such unnecessary waste