trials = [1] * 500

def make_nonlocal_writer():
    v_nonlocal = 1
    def inner(trials=trials):
        nonlocal v_nonlocal            # this is invalid syntax in Py2.x
        for t in trials:
            v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1
            v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1
            v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1
            v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1
            v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1; v_nonlocal = 1
    inner.__name__ = 'write_nonlocal'
    return inner

write_nonlocal = make_nonlocal_writer()

def make_nonlocal_deleter():
    v_nonlocal = 1
    def inner(trials=trials):
        nonlocal v_nonlocal            # this is invalid syntax in Py2.x
        for t in trials:
            v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal
            v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal
            v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal
            v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal
            v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal; v_nonlocal = 1; del v_nonlocal
    inner.__name__ = 'write_delete_nonlocal'
    return inner

delete_nonlocal = make_nonlocal_deleter()

def make_nonlocal_concatenater():
    v_nonlocal = b'unique'.decode()
    def inner(trials=trials):
        nonlocal v_nonlocal            # this is invalid syntax in Py2.x
        for t in trials:
            v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''
            v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''
            v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''
            v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''
            v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''; v_nonlocal = v_nonlocal + ''
    inner.__name__ = 'concat_nonlocal'
    return inner

concat_nonlocal = make_nonlocal_concatenater()

def make_nonlocal_iconcatenater():
    v_nonlocal = b'unique'.decode()
    def inner(trials=trials):
        nonlocal v_nonlocal            # this is invalid syntax in Py2.x
        for t in trials:
            v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''
            v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''
            v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''
            v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''
            v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''; v_nonlocal += ''
    inner.__name__ = 'iconcat_nonlocal'
    return inner

iconcat_nonlocal = make_nonlocal_iconcatenater()

#import dis
#dis.dis(concat_nonlocal)
#dis.dis(iconcat_nonlocal)

def loop_overhead(trials=trials):
    for t in trials:
        pass


if __name__=='__main__':
    from timeit import Timer

    for f in [write_nonlocal, delete_nonlocal,
              concat_nonlocal, iconcat_nonlocal,
              loop_overhead]:
        print('{:5.3f}\t{}'.format(min(Timer(f).repeat(7, 1000)), f.__name__))