python裝飾器 函式裝飾器，類裝飾器

只要實現此

模式，這個obj就叫乙個裝飾器

------------------------------>參考

函式裝飾器

例子--

-def
decorator
(func)
:def
inner
(*args,
**kwargs)
:print
('before...........'
) res = func(
*args,
**kwargs)
print
('after............'
)return res
return inner
@decorator
defrun()
:print
('run...............'
)return
0if __name__ ==
"__main__"
: run(
) run.__name__
# 此時decorator叫做裝飾器--
----
----
----
----
----
----
----
----
----
----
before...
....
....
run...
....
....
....
after...
....
....
.inner

from functools import wraps

defdecorator
(func)
: @wraps(func)
definner()
:print
('before...........'
) res = func(
)print
('after............'
)return res
return inner
@decorator
defrun()
:print
('run...............'
)return
0if __name__ ==
"__main__"
: run(
)print
(run.__name__)--
----
----
----
----
----
----
----
----
----
----
before...
....
....
run...
....
....
....
after...
....
....
.run

from functools import wraps

from datetime import datetime
defstart()
:return datetime.now(
)def
end():
return datetime.now(
)def
filter
(start_time, end_time)
:def
decorator
(func)
: @wraps(func)
definner
(*args,
**kwargs)
: s = start_time(
) res = func(
*args,
**kwargs)
e = end_time(
)print
("耗時{}"
.format
((e-s)
.total_seconds())
)return res
return inner
return decorator
@filter(start, end)
defrun()
:for i in
range
(10000):
for j in
range
(100):
print
(j)return
0if __name__ ==
"__main__"
: run(
)

類裝飾器

class

decorator
(object):
def__init__
(self, func)
: self.func = func
def__call__
(self,
*args,
**kwargs)
:print
('before............'
) res = self.func(
*args,
**kwargs)
print
('after............'
)return res
@decorator
defrun()
:print
('run............'
)if __name__ ==
"__main__"
: run()-
----
----
----
----
----
----
----
----
--before...
....
....
.run...
....
....
.after...
....
....
.

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