python 利用turtle库绘制笑脸和哭脸

安装swagger时，go get -u github.com/swaggo/swag/cmd/swag，遇到以下问题：

package golang.org/x/text/secure/bidirule: golang.org/x/text is a custom import path for https://go.googlesource.com/text, but /Users/guiruliu/go/src/golang.org/x/text is checked out from https://github.com/golang/text.git
package golang.org/x/text/unicode/bidi: golang.org/x/text is a custom import path for https://go.googlesource.com/text, but /Users/guiruliu/go/src/golang.org/x/text is checked out from https://github.com/golang/text.git
package golang.org/x/text/unicode/norm: golang.org/x/text is a custom import path for https://go.googlesource.com/text, but /Users/guiruliu/go/src/golang.org/x/text is checked out from https://github.com/golang/text.git
package golang.org/x/text/width: golang.org/x/text is a custom import path for https://go.googlesource.com/text, but /Users/guiruliu/go/src/golang.org/x/text is checked out from https://github.com/golang/text.git

golang.org/x下已有文件，尝试替换golang.org/x已然失败，于是，直接编译，步骤如下：

1、到src/github.com目录下：git clone https://github.com/swaggo/swag.git

2、cd swag/

3、go install ./cmd/swag