[英]if __name__ == '__main__' in IPython
I have Python scripts that use the if __name__ == '__main__'
trick to have some code only run when the script is called as a script and not when it is loaded into the interactive interpreter. 我有Python脚本使用
if __name__ == '__main__'
技巧,只有当脚本作为脚本调用时才会运行某些代码,而不是在将脚本加载到交互式解释器时运行。 However, when I edit these scripts from IPython using the %edit
command, IPython apparently sets __name__
to '__main__'
and so the code gets run every time I exit the editing session. 但是,当我使用
%edit
命令从IPython编辑这些脚本时,IPython显然将__name__
设置为'__main__'
,因此每次退出编辑会话时代码都会运行。 Is there a good way to make this code not run when the module is edited from IPython? 从IPython编辑模块时,是否有一种很好的方法可以使代码不运行?
When working from within Emacs (which I assume is close to what you get with %edit
), I usually use this trick: 当在Emacs中工作时(我假设它接近你使用
%edit
),我通常使用这个技巧:
if __name__ == '__main__' and '__file__' in globals():
# do what you need
For obvious reasons, __file__
is defined only for import
'ed modules, and not for interactive shell. 出于显而易见的原因,
__file__
仅为import
的ed模块定义,而不是为交互式shell定义。
It sounds like you might just need the -x
switch: 听起来你可能只需要
-x
开关:
In [1]: %edit
IPython will make a temporary file named: /tmp/ipython_edit_J8j9Wl.py
Editing... done. Executing edited code...
Name is main -- executing
Out[1]: "if __name__ == '__main__':\n print 'Name is main -- executing'\n"
In [2]: %edit -x /tmp/ipython_edit_J8j9Wl
Editing...
When you call %edit -x
the code is not executed after you exit your editor. 当您调用
%edit -x
,退出编辑器后不会执行代码。
IPython adds the function get_ipython()
to the globally available variables. IPython将函数
get_ipython()
到全局可用变量中。 So you can test, whether this function exist in globals()
to make your decision: 所以你可以测试一下
globals()
是否存在这个函数来做出决定:
if __name__ == '__main__' and "get_ipython" not in dir():
print "I'm not loaded with IPython"
The above code just tests whether there is a global variable with name get_ipython
. 上面的代码只测试是否存在名为
get_ipython
的全局变量。 To also test whether this variable is callable, you can do: 要测试此变量是否可调用,您可以执行以下操作:
if __name__ == '__main__' and not callable(globals().get("get_ipython", None)):
print "I'm not loaded with IPython"
IPython automatically executes the code you write with the %edit
command. IPython会自动执行您使用
%edit
命令编写的代码。 You can use %edit -x
to specify that you do NOT want to run the code you were just editing. 您可以使用
%edit -x
指定您不想运行刚刚编辑的代码。
http://ipython.org/ipython-doc/stable/api/generated/IPython.core.magics.code.html http://ipython.org/ipython-doc/stable/api/generated/IPython.core.magics.code.html
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