如何在Julia中恢复默认常量值

Question

根据docs，在朱莉娅，我可以做以下事情：

julia> pi
π = 3.1415926535897...

julia> pi = 3
Warning: imported binding for pi overwritten in module Main
3

我如何才能将pi恢复到适当的价值？

Answer 1

您可以访问Base.pi下的原始文件：

julia> pi
π = 3.1415926535897...

julia> pi = 3
Warning: imported binding for pi overwritten in module Main
3

julia> Base.pi
π = 3.1415926535897...

julia> pi = Base.pi;

julia> pi
π = 3.1415926535897...

julia> cos(pi)
-1.0