How to change instance type in EC2 Launch Template using AWS SDK?

I'm looking to change certain things in the launch template e.g. the instance type. Which means creating a new version while doing so.

I have gone through the SDK documentation for both Go and Python. Neither seem to have the paramenters that'd let me acheive the same.

I'm refering to these:
Go's function,
Python's function

Please help me out...

EC2 launch template is immutable. You must create a new version if you need to modify the current launch template version.

Here is an example of creating a new version and then making it the default version using AWS SDK v2.

Install these two packages:

"github.com/aws/aws-sdk-go-v2/service/ec2"
ec2types "github.com/aws/aws-sdk-go-v2/service/ec2/types"

Assuming you created the AWS config:

func createLaunchTemplateVersion(cfg aws.Config) {
	ec2client := ec2.NewFromConfig(cfg)
	template := ec2types.RequestLaunchTemplateData{
		InstanceType: ec2types.InstanceTypeT2Medium}
	createParams := ec2.CreateLaunchTemplateVersionInput{
		LaunchTemplateData: &template,
		LaunchTemplateName: aws.String("MyTemplate"),
		SourceVersion:      aws.String("1"),
	}
	outputCreate, err := ec2client.CreateLaunchTemplateVersion(context.Background(), &createParams)
	if err != nil {
		log.Fatal(err)
	}
	if outputCreate.Warning != nil {
		log.Fatalf("%v\n", outputCreate.Warning.Errors)
	}
	// set the new launch type version as the default version
	modifyParams := ec2.ModifyLaunchTemplateInput{
		DefaultVersion:     aws.String(strconv.FormatInt(*outputCreate.LaunchTemplateVersion.VersionNumber, 10)),
		LaunchTemplateName: outputCreate.LaunchTemplateVersion.LaunchTemplateName,
	}
	outputModify, err := ec2client.ModifyLaunchTemplate(context.Background(), &modifyParams)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("default version %d\n", *outputModify.LaunchTemplate.DefaultVersionNumber)
}