func (o *NamespaceOptions) Complete(f cmdutil.Factory, cmd *cobra.Command, args []string) error {
	name, err := NameFromCommandArgs(cmd, args)
	if err != nil {
		return err
	}
	restConfig, err := f.ToRESTConfig()
	if err != nil {
		return err
	}
	o.Client, err = coreclient.NewForConfig(restConfig)
	if err != nil {
		return err
	}
	o.Name = name
	o.DryRunStrategy, err = cmdutil.GetDryRunStrategy(cmd)
	if err != nil {
		return err
	}
	dynamicClient, err := f.DynamicClient()
	if err != nil {
		return err
	}
	discoveryClient, err := f.ToDiscoveryClient()
	if err != nil {
		return err
	}
	o.DryRunVerifier = resource.NewDryRunVerifier(dynamicClient, discoveryClient)
	o.CreateAnnotation = cmdutil.GetFlagBool(cmd, cmdutil.ApplyAnnotationsFlag)
	cmdutil.PrintFlagsWithDryRunStrategy(o.PrintFlags, o.DryRunStrategy)
	printer, err := o.PrintFlags.ToPrinter()
	if err != nil {
		return err
	}
	o.PrintObj = func(obj runtime.Object) error {
		return printer.PrintObj(obj, o.Out)
	}
	return nil
}
Complete completes all the required options
package create
import (
	"context"
	"fmt"
	"github.com/spf13/cobra"
	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/cli-runtime/pkg/resource"
	coreclient "k8s.io/client-go/kubernetes/typed/core/v1"
	"k8s.io/kubectl/pkg/scheme"
	"k8s.io/kubectl/pkg/util"
	"k8s.io/cli-runtime/pkg/genericclioptions"
	cmdutil "k8s.io/kubectl/pkg/cmd/util"
	"k8s.io/kubectl/pkg/util/i18n"
	"k8s.io/kubectl/pkg/util/templates"
)
var (
	namespaceLong = templates.LongDesc(i18n.T(`
		Create a namespace with the specified name.`))
	namespaceExample = templates.Examples(i18n.T(`
	  # Create a new namespace named my-namespace
	  kubectl create namespace my-namespace`))
)
type NamespaceOptions struct {
	PrintFlags *genericclioptions.PrintFlags
	Name string
	DryRunStrategy   cmdutil.DryRunStrategy
	DryRunVerifier   *resource.DryRunVerifier
	CreateAnnotation bool
	FieldManager     string
	Client *coreclient.CoreV1Client
	PrintObj func(obj runtime.Object) error
	genericclioptions.IOStreams
}
func NewNamespaceOptions(ioStreams genericclioptions.IOStreams) *NamespaceOptions {
	return &NamespaceOptions{
		PrintFlags: genericclioptions.NewPrintFlags("created").WithTypeSetter(scheme.Scheme),
		IOStreams:  ioStreams,
	}
}
func NewCmdCreateNamespace(f cmdutil.Factory, ioStreams genericclioptions.IOStreams) *cobra.Command {
	o := NewNamespaceOptions(ioStreams)
	cmd := &cobra.Command{
		Use:                   "namespace NAME [--dry-run=server|client|none]",
		DisableFlagsInUseLine: true,
		Aliases:               []string{"ns"},
		Short:                 i18n.T("Create a namespace with the specified name"),
		Long:                  namespaceLong,
		Example:               namespaceExample,
		Run: func(cmd *cobra.Command, args []string) {
			cmdutil.CheckErr(o.Complete(f, cmd, args))
			cmdutil.CheckErr(o.Validate())
			cmdutil.CheckErr(o.Run())
		},
	}
	o.PrintFlags.AddFlags(cmd)
	cmdutil.AddApplyAnnotationFlags(cmd)
	cmdutil.AddValidateFlags(cmd)
	cmdutil.AddDryRunFlag(cmd)
	cmdutil.AddFieldManagerFlagVar(cmd, &o.FieldManager, "kubectl-create")
	return cmd
}