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README	4.46 KB	-rw-r--r--	2024-03-19 22:46
abitype.py	5.44 KB	-rwxr-xr-x	2024-03-19 22:46
analyze_dxp.py	4.08 KB	-rw-r--r--	2024-03-19 22:46
byext.py	3.81 KB	-rwxr-xr-x	2024-03-19 22:46
byteyears.py	1.61 KB	-rwxr-xr-x	2024-03-19 22:46
checkpip.py	793 B	-rwxr-xr-x	2024-03-19 22:46
cleanfuture.py	8.42 KB	-rwxr-xr-x	2024-03-19 22:46
combinerefs.py	4.35 KB	-rwxr-xr-x	2024-03-19 22:46
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crlf.py	632 B	-rwxr-xr-x	2024-03-19 22:46
db2pickle.py	3.54 KB	-rwxr-xr-x	2024-03-19 22:46
diff.py	2.2 KB	-rwxr-xr-x	2024-03-19 22:46
dutree.doc	2.18 KB	-rw-r--r--	2024-03-19 22:46
dutree.py	1.6 KB	-rwxr-xr-x	2024-03-19 22:46
eptags.py	1.54 KB	-rwxr-xr-x	2024-03-19 22:46
find-uname.py	1.18 KB	-rwxr-xr-x	2024-03-19 22:46
find_recursionlimit.py	3.9 KB	-rwxr-xr-x	2024-03-19 22:46
finddiv.py	2.48 KB	-rwxr-xr-x	2024-03-19 22:46
findlinksto.py	1.05 KB	-rwxr-xr-x	2024-03-19 22:46
findnocoding.py	2.88 KB	-rwxr-xr-x	2024-03-19 22:46
fixcid.py	9.93 KB	-rwxr-xr-x	2024-03-19 22:46
fixdiv.py	13.91 KB	-rwxr-xr-x	2024-03-19 22:46
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fixps.py	892 B	-rwxr-xr-x	2024-03-19 22:46
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get-remote-certificate.py	2.25 KB	-rwxr-xr-x	2024-03-19 22:46
google.py	501 B	-rwxr-xr-x	2024-03-19 22:46
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idle3	96 B	-rwxr-xr-x	2024-03-19 22:46
ifdef.py	3.62 KB	-rwxr-xr-x	2024-03-19 22:46
import_diagnostics.py	999 B	-rwxr-xr-x	2024-03-19 22:46
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mailerdaemon.py	7.85 KB	-rwxr-xr-x	2024-03-19 22:46
make_ctype.py	2.23 KB	-rwxr-xr-x	2024-03-19 22:46
md5sum.py	2.46 KB	-rwxr-xr-x	2024-03-19 22:46
mkreal.py	1.59 KB	-rwxr-xr-x	2024-03-19 22:46
ndiff.py	3.73 KB	-rwxr-xr-x	2024-03-19 22:46
nm2def.py	2.42 KB	-rwxr-xr-x	2024-03-19 22:46
objgraph.py	5.8 KB	-rwxr-xr-x	2024-03-19 22:46
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parseentities.py	1.7 KB	-rwxr-xr-x	2024-03-19 22:46
patchcheck.py	10.51 KB	-rwxr-xr-x	2024-03-19 22:46
pathfix.py	6.63 KB	-rwxr-xr-x	2024-03-19 22:46
pdeps.py	3.91 KB	-rwxr-xr-x	2024-03-19 22:46
pep384_macrocheck.py	4.61 KB	-rw-r--r--	2024-03-19 22:46
pickle2db.py	3.93 KB	-rwxr-xr-x	2024-03-19 22:46
pindent.py	16.73 KB	-rwxr-xr-x	2024-03-19 22:46
ptags.py	1.28 KB	-rwxr-xr-x	2024-03-19 22:46
pydoc3	80 B	-rwxr-xr-x	2024-03-19 22:46
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reindent-rst.py	279 B	-rwxr-xr-x	2024-03-19 22:46
reindent.py	11.37 KB	-rwxr-xr-x	2024-03-19 22:46
rgrep.py	1.54 KB	-rwxr-xr-x	2024-03-19 22:46
run_tests.py	1.78 KB	-rw-r--r--	2024-03-19 22:46
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texi2html.py	68.72 KB	-rwxr-xr-x	2024-03-19 22:46
untabify.py	1.27 KB	-rwxr-xr-x	2024-03-19 22:46
update_file.py	762 B	-rw-r--r--	2024-03-19 22:46
var_access_benchmark.py	11.63 KB	-rw-r--r--	2024-03-19 22:46
verify_ensurepip_wheels.py	3.31 KB	-rwxr-xr-x	2024-03-19 22:46
which.py	1.65 KB	-rwxr-xr-x	2024-03-19 22:46
win_add2path.py	1.62 KB	-rw-r--r--	2024-03-19 22:46

Rename

'Show relative speeds of local, nonlocal, global, and built-in access.'

# Please leave this code so that it runs under older versions of
# Python 3 (no f-strings).  That will allow benchmarking for
# cross-version comparisons.  To run the benchmark on Python 2,
# comment-out the nonlocal reads and writes.

from collections import deque, namedtuple

trials = [None] * 500
steps_per_trial = 25

class A(object):
    def m(self):
        pass

class B(object):
    __slots__ = 'x'
    def __init__(self, x):
        self.x = x

class C(object):
    def __init__(self, x):
        self.x = x

def read_local(trials=trials):
    v_local = 1
    for t in trials:
        v_local;    v_local;    v_local;    v_local;    v_local
        v_local;    v_local;    v_local;    v_local;    v_local
        v_local;    v_local;    v_local;    v_local;    v_local
        v_local;    v_local;    v_local;    v_local;    v_local
        v_local;    v_local;    v_local;    v_local;    v_local

def make_nonlocal_reader():
    v_nonlocal = 1
    def inner(trials=trials):
        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__ = 'read_nonlocal'
    return inner

read_nonlocal = make_nonlocal_reader()

v_global = 1
def read_global(trials=trials):
    for t in trials:
        v_global; v_global; v_global; v_global; v_global
        v_global; v_global; v_global; v_global; v_global
        v_global; v_global; v_global; v_global; v_global
        v_global; v_global; v_global; v_global; v_global
        v_global; v_global; v_global; v_global; v_global

def read_builtin(trials=trials):
    for t in trials:
        oct; oct; oct; oct; oct
        oct; oct; oct; oct; oct
        oct; oct; oct; oct; oct
        oct; oct; oct; oct; oct
        oct; oct; oct; oct; oct

def read_classvar_from_class(trials=trials, A=A):
    A.x = 1
    for t in trials:
        A.x;    A.x;    A.x;    A.x;    A.x
        A.x;    A.x;    A.x;    A.x;    A.x
        A.x;    A.x;    A.x;    A.x;    A.x
        A.x;    A.x;    A.x;    A.x;    A.x
        A.x;    A.x;    A.x;    A.x;    A.x

def read_classvar_from_instance(trials=trials, A=A):
    A.x = 1
    a = A()
    for t in trials:
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x

def read_instancevar(trials=trials, a=C(1)):
    for t in trials:
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x

def read_instancevar_slots(trials=trials, a=B(1)):
    for t in trials:
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x

def read_namedtuple(trials=trials, D=namedtuple('D', ['x'])):
    a = D(1)
    for t in trials:
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x
        a.x;    a.x;    a.x;    a.x;    a.x

def read_boundmethod(trials=trials, a=A()):
    for t in trials:
        a.m;    a.m;    a.m;    a.m;    a.m
        a.m;    a.m;    a.m;    a.m;    a.m
        a.m;    a.m;    a.m;    a.m;    a.m
        a.m;    a.m;    a.m;    a.m;    a.m
        a.m;    a.m;    a.m;    a.m;    a.m

def write_local(trials=trials):
    v_local = 1
    for t in trials:
        v_local = 1; v_local = 1; v_local = 1; v_local = 1; v_local = 1
        v_local = 1; v_local = 1; v_local = 1; v_local = 1; v_local = 1
        v_local = 1; v_local = 1; v_local = 1; v_local = 1; v_local = 1
        v_local = 1; v_local = 1; v_local = 1; v_local = 1; v_local = 1
        v_local = 1; v_local = 1; v_local = 1; v_local = 1; v_local = 1

def make_nonlocal_writer():
    v_nonlocal = 1
    def inner(trials=trials):
        nonlocal v_nonlocal
        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 write_global(trials=trials):
    global v_global
    for t in trials:
        v_global = 1; v_global = 1; v_global = 1; v_global = 1; v_global = 1
        v_global = 1; v_global = 1; v_global = 1; v_global = 1; v_global = 1
        v_global = 1; v_global = 1; v_global = 1; v_global = 1; v_global = 1
        v_global = 1; v_global = 1; v_global = 1; v_global = 1; v_global = 1
        v_global = 1; v_global = 1; v_global = 1; v_global = 1; v_global = 1

def write_classvar(trials=trials, A=A):
    for t in trials:
        A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1
        A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1
        A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1
        A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1
        A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1;    A.x = 1

def write_instancevar(trials=trials, a=C(1)):
    for t in trials:
        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1

def write_instancevar_slots(trials=trials, a=B(1)):
    for t in trials:
        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1
        a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1;    a.x = 1

def read_list(trials=trials, a=[1]):
    for t in trials:
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]

def read_deque(trials=trials, a=deque([1])):
    for t in trials:
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]

def read_dict(trials=trials, a={0: 1}):
    for t in trials:
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]
        a[0];   a[0];   a[0];   a[0];   a[0]

def read_strdict(trials=trials, a={'key': 1}):
    for t in trials:
        a['key'];   a['key'];   a['key'];   a['key'];   a['key']
        a['key'];   a['key'];   a['key'];   a['key'];   a['key']
        a['key'];   a['key'];   a['key'];   a['key'];   a['key']
        a['key'];   a['key'];   a['key'];   a['key'];   a['key']
        a['key'];   a['key'];   a['key'];   a['key'];   a['key']

def list_append_pop(trials=trials, a=[1]):
    ap, pop = a.append, a.pop
    for t in trials:
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()

def deque_append_pop(trials=trials, a=deque([1])):
    ap, pop = a.append, a.pop
    for t in trials:
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop()

def deque_append_popleft(trials=trials, a=deque([1])):
    ap, pop = a.append, a.popleft
    for t in trials:
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop();
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop();
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop();
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop();
        ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop(); ap(1); pop();

def write_list(trials=trials, a=[1]):
    for t in trials:
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1

def write_deque(trials=trials, a=deque([1])):
    for t in trials:
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1

def write_dict(trials=trials, a={0: 1}):
    for t in trials:
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1
        a[0]=1; a[0]=1; a[0]=1; a[0]=1; a[0]=1

def write_strdict(trials=trials, a={'key': 1}):
    for t in trials:
        a['key']=1; a['key']=1; a['key']=1; a['key']=1; a['key']=1
        a['key']=1; a['key']=1; a['key']=1; a['key']=1; a['key']=1
        a['key']=1; a['key']=1; a['key']=1; a['key']=1; a['key']=1
        a['key']=1; a['key']=1; a['key']=1; a['key']=1; a['key']=1
        a['key']=1; a['key']=1; a['key']=1; a['key']=1; a['key']=1

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

if __name__=='__main__':

from timeit import Timer

for f in [
            'Variable and attribute read access:',
            read_local, read_nonlocal, read_global, read_builtin,
            read_classvar_from_class, read_classvar_from_instance,
            read_instancevar, read_instancevar_slots,
            read_namedtuple, read_boundmethod,
            '\nVariable and attribute write access:',
            write_local, write_nonlocal, write_global,
            write_classvar, write_instancevar, write_instancevar_slots,
            '\nData structure read access:',
            read_list, read_deque, read_dict, read_strdict,
            '\nData structure write access:',
            write_list, write_deque, write_dict, write_strdict,
            '\nStack (or queue) operations:',
            list_append_pop, deque_append_pop, deque_append_popleft,
            '\nTiming loop overhead:',
            loop_overhead]:
        if isinstance(f, str):
            print(f)
            continue
        timing = min(Timer(f).repeat(7, 1000))
        timing *= 1000000 / (len(trials) * steps_per_trial)
        print('{:6.1f} ns\t{}'.format(timing, f.__name__))