在Julia脚本中，您能否确定该脚本是否已导入或直接执行? [英] Within a Julia script, can you tell whether the script has been imported or executed directly?

问题描述

python中的一个常见约定是按如下所示构造脚本的主要功能，因此可以直接将其作为脚本运行，也可以在导入时不执行main()的情况下将其导入:

A common convention in python is to structure the main functionality of a script as follows, so it can be both run as a script directly or imported without executing main() at the time of import:

def main():
    do_stuff()

if __name__ == '__main__':
    main()

在Julia中是否设置了类似的变量，以便脚本可以知道它是使用require("script.jl"导入的还是直接执行的?

Is there a similar variable that gets set in Julia, so that the script can be aware of whether it was imported using require("script.jl") or executed directly?

例如，假设我有两个脚本a.jl和b.jl，以及一个表现如下的magic_function():

For example, say I have two scripts, a.jl and b.jl, along with a magic_function() that behaves as follows:

a.jl :

println("Did we execute a.jl directly? ", magic_function())

b.jl :

require("a.jl")

执行以下命令会导致...

Executing the following commands results in ...

> julia a.jl
Did we execute a.jl directly? true
> julia b.jl
Did we execute a.jl directly? false

Julia的当前发行版中是否存在像magic_function()这样的函数?

Does a function like magic_function() exist in the current distribution of Julia?

推荐答案

虽然isinteractive()使您可以识别REPL是否在命令行上运行/是否已导入其他代码中，但无法获得与以下代码完全相同的功能Python的if __name__ == '__main__'.

While isinteractive() will let you discern the REPL from being run on the commandline/imported into other code, there is no way to get exactly the same functionality as Python's if __name__ == '__main__'.

这似乎没有计划作为功能.请参阅邮件列表上的讨论. (从2013年6月开始)

This does not seem to be planned as a feature. See this discussion on the mailing list. (from June 2013)

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