A C function or method call without keyword arguments gets reported by
the profiler as expected (in the line with "{method 'sort' of 'list'
object}"):

>>> cProfile.run("[].sort()")
         4 function calls in 0.000 CPU seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.000    0.000 <string>:1(<module>)
        1    0.000    0.000    0.000    0.000 {built-in method exec}
        1    0.000    0.000    0.000    0.000 {method 'disable' of
'_lsprof.Profiler' objects}
        1    0.000    0.000    0.000    0.000 {method 'sort' of 'list'
objects}


However, once a keyword argument is given, the relevant line is missing:

>>> cProfile.run("[].sort(reverse=True)")
         3 function calls in 0.000 CPU seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.000    0.000 <string>:1(<module>)
        1    0.000    0.000    0.000    0.000 {built-in method exec}
        1    0.000    0.000    0.000    0.000 {method 'disable' of
'_lsprof.Profiler' objects}


This happens with profile and cProfile in 2.6 and 3.0.