How to call golang package

1. My GOPATH environment variable value, as shown below:

2. Enter the src directory in the GOPATH path, The directory name is the starting position of the referenced package, as shown below:

3. Example: Here, the package of the same project is referenced, the source file "learn/main" /main.go" refers to the PrintIota method under the package "learn/lion". Here learn is the directory under src under GOPATH.

4. If the above method does not work, then the GOPATH path is incorrect, or GOPATH is disabled by other third-party package management tools, such as go.mod. For vendors, etc., you must use GOPATH to follow the above instructions. I had the problem of citing errors when my GOPATH was disabled by go.mod.

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