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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def resolve( requirements: typing.List[str], index_urls: list = None, python_version: int = 3, exclude_packages: set = None, transitive: bool = True, subgraph_check_api: str = None, ) -> dict: """Resolve given requirements for the given Python version."""

    assert python_version in (2, 3), "Unknown Python version"

    if subgraph_check_api and not transitive:
        _LOGGER.error("The check against subgraph API cannot be done if no transitive dependencies are resolved")
        sys.exit(2)

    python_bin = "python3" if python_version == 3 else "python2"
    run_command("virtualenv -p python3 venv")
    python_bin = "venv/bin/" + python_bin

    run_command("{} -m pip install pipdeptree".format(python_bin))
    environment_details = _get_environment_details(python_bin)

    result = {"tree": [], "errors": [], "unparsed": [], "unresolved": [], "environment": environment_details}

    all_solvers = []
    for index_url in index_urls:
        source = Source(index_url)
        all_solvers.append(PythonSolver(fetcher_kwargs={"source": source}))

    for solver in all_solvers:
        solver_result = _do_resolve_index(
            python_bin=python_bin,
            solver=solver,
            all_solvers=all_solvers,
            requirements=requirements,
            exclude_packages=exclude_packages,
            transitive=transitive,
            subgraph_check_api=subgraph_check_api,
        )

        result["tree"].extend(solver_result["tree"])
        result["errors"].extend(solver_result["errors"])
        result["unparsed"].extend(solver_result["unparsed"])
        result["unresolved"].extend(solver_result["unresolved"])

    return result