import org.apache.maven.project.CycleDetectedException;
import org.apache.maven.project.DuplicateProjectException;
import org.apache.maven.project.MavenProject;
import org.apache.maven.project.ProjectBuildingException;
import org.apache.maven.project.collector.MultiModuleCollectionStrategy;
import org.apache.maven.project.collector.PomlessCollectionStrategy;
import org.apache.maven.project.collector.RequestPomCollectionStrategy;

 * build if those projects do not exist.
 */
public class ProjectActivation {

    /**
     * ProjectActivationSettings
     * @param selector the selector of a project, which can be the project directory, [groupId]:[artifactId] or :[artifactId]
     * @param activationSettings describes how/when to active or deactivate the project
     */

$ cd code
// Create a directory for this project
$ mkdir awesome-project
// Enter into that project directory
$ cd awesome-project
```

</div>

## Create a Virtual Environment { #create-a-virtual-environment }

When you start working on a Python project **for the first time**, create a virtual environment **<dfn title="there are other options, this is a simple guideline">inside your project</dfn>**.

/// tip

 * projects with longer dependency chains are built first. When projects have
 * the same weight, they are ordered by project ID for deterministic results.
 *
 * <p><b>Example:</b>
 * <p>Consider projects with dependencies: A → B → D, A → C → D
 * <ul>
 * <li>Project D: weight = 1 (no downstream dependencies)</li>
 * <li>Project B: weight = 2 (1 + max(D=1))</li>
 * <li>Project C: weight = 2 (1 + max(D=1))</li>

     * which must be able to run on a certain set of runtimes depends on another project,
     * that other project must support the runtimes of the project with requirements.
     *
     * @return A mapping of project paths to their computed runtimes, including
     * the specific projects that triggered each requirement.
     */
    private fun computeTargetRuntimes(projects: Map<String, ProjectInfo>): Map<String, Map<TargetRuntime, Set<String>>> {

     */
    @Deprecated
    MavenExecutionRequest setSelectedProjects(List<String> projects);

    /**
     * @deprecated Since Maven 4: use {@link #getProjectActivation()}.
     */
    @Deprecated
    List<String> getSelectedProjects();

    /**
     * @param projects the projects to exclude
     * @return this MavenExecutionRequest
     * @since 3.2

        for (MavenProject project : projects) {
            request.setArtifact(new ProjectArtifact(project));
            request.setArtifactDependencies(project.getDependencyArtifacts());
            request.setManagedVersionMap(project.getManagedVersionMap());
            request.setRemoteRepositories(project.getRemoteArtifactRepositories());

            throws DuplicateProjectException {
        Map<String, MavenProject> index = new LinkedHashMap<>();
        Map<String, List<File>> collisions = new LinkedHashMap<>();

        for (MavenProject project : projects) {
            String projectId = ArtifactUtils.key(project.getGroupId(), project.getArtifactId(), project.getVersion());

     * is a prerequisite of the given project.
     *
     * @param project The project whose upstream projects should be retrieved, must not be {@code null}.
     * @param transitive A flag whether to retrieve all direct and indirect upstream projects or just the immediate
     *            upstream projects.

        this(projects, projects);
    }

    /**
     * Creates a new project dependency graph based on the specified projects.
     *
     * @param allProjects All collected projects.
     * @param projects    The projects to create the dependency graph with.
     * @throws DuplicateProjectException
     * @throws CycleDetectedException
     * @since 3.5.0