如何在Julia中恢复默认常量值

Question

根据文档,在朱莉娅,我可以做以下事情:

julia> pi
? = 3.1415926535897...

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

我怎样才能pi恢复它的正确价值？

Answer 1

您可以访问原文Base.pi:

julia> pi
? = 3.1415926535897...

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

julia> Base.pi
? = 3.1415926535897...

julia> pi = Base.pi;

julia> pi
? = 3.1415926535897...

julia> cos(pi)
-1.0