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Date: Tue, 15 Jan 2013 22:20:04 +0800
Subject: i can't understand decorator
From: contro opinion <contropinion@gmail.com>
To: python-list <python-list@python.org>
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>>> def deco(func):
...      def kdeco():
...          print("before myfunc() called.")
...          func()
...          print("  after myfunc() called.")
...      return kdeco
...
>>> @deco
... def myfunc():
...      print(" myfunc() called.")
...
>>> myfunc()
before myfunc() called.
 myfunc() called.
  after myfunc() called.
>>> deco(myfunc)()
before myfunc() called.
before myfunc() called.
 myfunc() called.
  after myfunc() called.
  after myfunc() called.
1.
why there are two lines :before myfunc() called.and tow lines :after
myfunc() called. in the output?
2.why the result is not
before myfunc() called.
 myfunc() called.
  after myfunc() called.
before myfunc() called.
 myfunc() called.
  after myfunc() called.

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<div dir=3D"ltr">&gt;&gt;&gt; def deco(func):<br>...=A0=A0=A0=A0=A0 def kde=
co():<br>...=A0=A0=A0=A0=A0=A0=A0=A0=A0 print(&quot;before myfunc() called.=
&quot;)<br>...=A0=A0=A0=A0=A0=A0=A0=A0=A0 func()<br>...=A0=A0=A0=A0=A0=A0=
=A0=A0=A0 print(&quot;=A0 after myfunc() called.&quot;)<br>...=A0=A0=A0=A0=
=A0 return kdeco<br>
... <br>&gt;&gt;&gt; @deco<br>... def myfunc():<br>...=A0=A0=A0=A0=A0 print=
(&quot; myfunc() called.&quot;)<br>... <br>&gt;&gt;&gt; myfunc()<br>before =
myfunc() called.<br>=A0myfunc() called.<br>=A0 after myfunc() called.<br>&g=
t;&gt;&gt; deco(myfunc)()<br>
before myfunc() called.<br>before myfunc() called.<br>=A0myfunc() called.<b=
r>=A0 after myfunc() called.<br>=A0 after myfunc() called.<br>1.<br>why the=
re are two lines :before myfunc() called.and tow lines :after myfunc() call=
ed. in the output?<br>
2.why the result is not <br>before myfunc() called.<br>=A0myfunc() called.<=
br>=A0 after myfunc() called.<br>before myfunc() called.<br>=A0myfunc() cal=
led.<br>=A0 after myfunc() called.<br></div>

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