# Show relative speeds of local, nonlocal, global, and built-in access.
trials = [1] * 500
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
class A(object):
def m(self):
pass
def read_classvar(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_instancevar(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_unboundmethod(trials=trials, A=A):
# real unbound methods are only in Py2.x
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 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 # 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 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=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 loop_overhead(trials=trials):
for t in trials:
pass
if __name__=='__main__':
from timeit import Timer
for f in [read_local, read_nonlocal, read_global, read_builtin,
read_classvar, read_instancevar, read_unboundmethod, read_boundmethod,
write_local, write_nonlocal, write_global,
write_classvar, write_instancevar,
loop_overhead]:
print('{:5.3f}\t{}'.format(min(Timer(f).repeat(7, 1000)), f.__name__))
Diff to Previous Revision
--- revision 4 2011-08-10 18:38:10
+++ revision 5 2011-08-10 23:54:12
@@ -42,7 +42,7 @@
oct; oct; oct; oct; oct
oct; oct; oct; oct; oct
-class A:
+class A(object):
def m(self):
pass
@@ -64,6 +64,15 @@
a.x; a.x; a.x; a.x; a.x
a.x; a.x; a.x; a.x; a.x
+def read_unboundmethod(trials=trials, A=A):
+ # real unbound methods are only in Py2.x
+ 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 read_boundmethod(trials=trials, a=A()):
for t in trials:
a.m; a.m; a.m; a.m; a.m
@@ -84,7 +93,7 @@
def make_nonlocal_writer():
v_nonlocal = 1
def inner(trials=trials):
- nonlocal v_nonlocal
+ 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
@@ -130,7 +139,7 @@
from timeit import Timer
for f in [read_local, read_nonlocal, read_global, read_builtin,
- read_classvar, read_instancevar, read_boundmethod,
+ read_classvar, read_instancevar, read_unboundmethod, read_boundmethod,
write_local, write_nonlocal, write_global,
write_classvar, write_instancevar,
loop_overhead]:
