Question

在Python中我们可以做到：

try:
    import foo
    # do stuff
except ImportError:
    print("Consider installing package 'foo' for full functionality.")

是否有可能在朱莉娅中发现类似的例外情况？

Answer 1

目前，Julia没有导入异常机制，您无法将using置于try-catch块中。

在对这个答案的评论中，问题被提炼为真正要求如何做有条件的包含。以下是如何执行此操作的示例：

# We are making a module that conditionally includes ImageView
module MyModule
    # Optional plotting features using ImageView
    # The view function is defined in ImageView
    export view  # Re-export ImageView.view (optional)
    try
        require("ImageView")  # Will throw error if ImageView not installed
        global view(args...) = Main.ImageView.view(args...)
    catch
        # Needs global to put it in the module scope, not the catch scope
        global view(args...) = error("ImageView.jl required for drawing!")
        # Alternatively, global view(args...) = nothing
    end
    # ....
end

朱莉娅有一些导入异常机制？

1 个答案: