# 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:
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_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=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_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 3 2011-08-10 04:07:55
+++ revision 4 2011-08-10 18:38:10
@@ -1,9 +1,9 @@
# Show relative speeds of local, nonlocal, global, and built-in access.
-trials = [None] * 500
+trials = [1] * 500
def read_local(trials=trials):
- v_local = None
+ 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
@@ -12,7 +12,7 @@
v_local; v_local; v_local; v_local; v_local
def make_nonlocal_reader():
- v_nonlocal = None
+ v_nonlocal = 1
def inner(trials=trials):
for t in trials:
v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal; v_nonlocal
@@ -25,7 +25,7 @@
read_nonlocal = make_nonlocal_reader()
-v_global = None
+v_global = 1
def read_global(trials=trials):
for t in trials:
v_global; v_global; v_global; v_global; v_global
@@ -47,7 +47,7 @@
pass
def read_classvar(trials=trials, A=A):
- A.x = None
+ 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
@@ -56,7 +56,7 @@
A.x; A.x; A.x; A.x; A.x
def read_instancevar(trials=trials, a=A()):
- a.x = None
+ 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
@@ -73,24 +73,24 @@
a.m; a.m; a.m; a.m; a.m
def write_local(trials=trials):
- v_local = None
+ v_local = 1
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
+ 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 = None
+ v_nonlocal = 1
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
+ 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
@@ -99,27 +99,27 @@
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
+ 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 = 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
+ 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 = 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
+ 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:
