# Show relative speeds of local, nonlocal, global, and built-in access.
trials = [None] * 500
def read_local(trials=trials):
v_local = None
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 = None
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 = None
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:
pass
def read_classvar(trials=trials, A=A):
A.x = None
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 = None
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 write_local(trials=trials):
v_local = None
for t in trials:
v_local = None; v_local = None; v_local = None; v_local = None; v_local = None
v_local = None; v_local = None; v_local = None; v_local = None; v_local = None
v_local = None; v_local = None; v_local = None; v_local = None; v_local = None
v_local = None; v_local = None; v_local = None; v_local = None; v_local = None
v_local = None; v_local = None; v_local = None; v_local = None; v_local = None
def make_nonlocal_writer():
v_nonlocal = None
def inner(trials=trials):
nonlocal v_nonlocal
for t in trials:
v_nonlocal = None; v_nonlocal = None; v_nonlocal = None; v_nonlocal = None; v_nonlocal = None
v_nonlocal = None; v_nonlocal = None; v_nonlocal = None; v_nonlocal = None; v_nonlocal = None
v_nonlocal = None; v_nonlocal = None; v_nonlocal = None; v_nonlocal = None; v_nonlocal = None
v_nonlocal = None; v_nonlocal = None; v_nonlocal = None; v_nonlocal = None; v_nonlocal = None
v_nonlocal = None; v_nonlocal = None; v_nonlocal = None; v_nonlocal = None; v_nonlocal = None
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 = None; v_global = None; v_global = None; v_global = None; v_global = None
v_global = None; v_global = None; v_global = None; v_global = None; v_global = None
v_global = None; v_global = None; v_global = None; v_global = None; v_global = None
v_global = None; v_global = None; v_global = None; v_global = None; v_global = None
v_global = None; v_global = None; v_global = None; v_global = None; v_global = None
def write_classvar(trials=trials, A=A):
for t in trials:
A.x = None; A.x = None; A.x = None; A.x = None; A.x = None
A.x = None; A.x = None; A.x = None; A.x = None; A.x = None
A.x = None; A.x = None; A.x = None; A.x = None; A.x = None
A.x = None; A.x = None; A.x = None; A.x = None; A.x = None
A.x = None; A.x = None; A.x = None; A.x = None; A.x = None
def write_instancevar(trials=trials, a=A()):
for t in trials:
a.x = None; a.x = None; a.x = None; a.x = None; a.x = None
a.x = None; a.x = None; a.x = None; a.x = None; a.x = None
a.x = None; a.x = None; a.x = None; a.x = None; a.x = None
a.x = None; a.x = None; a.x = None; a.x = None; a.x = None
a.x = None; a.x = None; a.x = None; a.x = None; a.x = None
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,
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 1 2011-08-09 21:27:27
+++ revision 2 2011-08-10 03:51:39
@@ -35,13 +35,33 @@
v_global; v_global; v_global; v_global; v_global
def read_builtin(trials=trials):
- v_local = None
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:
+ pass
+
+def read_classvar(trials=trials, A=A):
+ A.x = None
+ 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 = None
+ 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 write_local(trials=trials):
v_local = None
@@ -76,6 +96,22 @@
v_global = None; v_global = None; v_global = None; v_global = None; v_global = None
v_global = None; v_global = None; v_global = None; v_global = None; v_global = None
+def write_classvar(trials=trials, A=A):
+ for t in trials:
+ A.x = None; A.x = None; A.x = None; A.x = None; A.x = None
+ A.x = None; A.x = None; A.x = None; A.x = None; A.x = None
+ A.x = None; A.x = None; A.x = None; A.x = None; A.x = None
+ A.x = None; A.x = None; A.x = None; A.x = None; A.x = None
+ A.x = None; A.x = None; A.x = None; A.x = None; A.x = None
+
+def write_instancevar(trials=trials, a=A()):
+ for t in trials:
+ a.x = None; a.x = None; a.x = None; a.x = None; a.x = None
+ a.x = None; a.x = None; a.x = None; a.x = None; a.x = None
+ a.x = None; a.x = None; a.x = None; a.x = None; a.x = None
+ a.x = None; a.x = None; a.x = None; a.x = None; a.x = None
+ a.x = None; a.x = None; a.x = None; a.x = None; a.x = None
+
def loop_overhead(trials=trials):
for t in trials:
pass
@@ -85,5 +121,8 @@
from timeit import Timer
for f in [read_local, read_nonlocal, read_global, read_builtin,
- write_local, write_nonlocal, write_global, loop_overhead]:
- print(min(Timer(f).repeat(7, 1000)), f.__name__, sep='\t')
+ read_classvar, read_instancevar,
+ 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__))
