from __future__ import with_statement
import timeit

setup = """
class dummy_cm():
    def __enter__(self):
        pass
    def __exit__(self, *args):
        pass

cm = dummy_cm()

"""

cmd_with = """
with cm:
    pass
"""

cmd_call = """
cm.__enter__()
try:
    pass
finally:
    cm.__exit__()
"""

print "With statement timing:"
timeit.main(["-r", "5", "-s", setup, cmd_with])

print "Direct call timing:"
timeit.main(["-r", "5", "-s", setup, cmd_call])