C doesn't guarantee any evaluation order so a statement like f(g1()+g2(), g3(), g4()) might execute g1(), g2(), g3(), and g4() in any order (although f() would be executed after all of them)
What about Python? My experimentation for Python 2.7 shows that it appears to be left-to-right order of evaluation but I wonder if this is specified to be the case.
Test program:
def somefunc(prolog, epilog):
print prolog
def f(a, b, *args):
print epilog
return f
def f(text):
print text
return 1
somefunc('f1','f2')(f('hey'),f('ho'),f('hahaha'),f('tweedledee')+f('tweedledum'))
which prints
f1
hey
ho
hahaha
tweedledee
tweedledum
f2