def collect_loaded_packages() -> List[Tuple[str, str]]:
    """
    Return the currently loaded package names and their versions.
    """
    dists = get_installed_distributions()
    get_dist_files = DistFilesFinder()
    file_table = {}
    for dist in dists:
        for file in get_dist_files(dist):
            file_table[file] = dist
    used_dists = set()
    # we greedily load all values to a list to avoid weird
    # "dictionary changed size during iteration" errors
    for module in list(sys.modules.values()):
        try:
            dist = file_table[module.__file__]
        except (AttributeError, KeyError):
            continue
        used_dists.add(dist)
    return sorted((dist.project_name, dist.version) for dist in used_dists) 

def collect_environment(self, overwrite_variables=None):
        import socket
        import os
        import pip
        import platform

        env = {}

        if not overwrite_variables:
            overwrite_variables = {}

        import aetros
        env['aetros_version'] = aetros.__version__
        env['python_version'] = platform.python_version()
        env['python_executable'] = sys.executable

        env['hostname'] = socket.gethostname()
        env['variables'] = dict(os.environ)
        env['variables'].update(overwrite_variables)

        if 'AETROS_SSH_KEY' in env['variables']: del env['variables']['AETROS_SSH_KEY']
        if 'AETROS_SSH_KEY_BASE64' in env['variables']: del env['variables']['AETROS_SSH_KEY_BASE64']

        env['pip_packages'] = sorted([[i.key, i.version] for i in pip.get_installed_distributions()])
        self.set_system_info('environment', env) 

def _save_pip_list(self, tar):
        '''Dump a pip list containing packages and versions.

        :param dest: unicode -- directory of dumped pip list
        :param tar: tarfile object -- tar where pip list dump will be added
        '''

        pkgs = pip.get_installed_distributions()
        sorted_pkgs = sorted(pkgs, key=lambda pkg: pkg._key)
        sorted_pkg_names = [str(pkg) for pkg in sorted_pkgs]
        pip_list_file = os.path.join(self.tar_dest, 'pip_list.txt')
        with open(pip_list_file, 'w') as pip_file:
            pip_file.write('\n'.join(sorted_pkg_names))
        self._add_file_to_tar(self.tar_dest, 'pip_list.txt', tar)
        os.remove(pip_list_file)
        return sorted_pkgs 

def _save_pip_list(self, tar):
        '''Dump a pip list, containing packages and versions.

        :param dest: unicode -- directory of dumped pip list
        :param tar: tarfile object -- tar where pip list dump will be added
        '''

        pkgs = pip.get_installed_distributions()
        sorted_pkgs = sorted(pkgs, key=lambda pkg: pkg._key)
        sorted_pkg_names = [str(pkg) for pkg in sorted_pkgs]
        pip_list_file = os.path.join(self.tar_dest, 'pip_list.txt')
        with open(pip_list_file, 'w') as pip_file:
            pip_file.write('\n'.join(sorted_pkg_names))
        self._add_file_to_tar(self.tar_dest, 'pip_list.txt', tar)
        os.remove(pip_list_file)
        return sorted_pkgs 

def check_dependency():
    list_deps = []
    missing_deps = []

    with open('requirements.txt') as f:
        list_deps = f.read().splitlines()

    pip_list = sorted([(i.key) for i in pip.get_installed_distributions()])

    for req_dep in list_deps:
        if req_dep not in pip_list:
            missing_deps.append(req_dep)

    if missing_deps:
        print "You are missing a module for Datasploit. Please install them using: "
        print "pip install -r requirements.txt"
        sys.exit() 

def can_use_gpu():
    # Check that 'tensorflow-gpu' is installed on the current code-env
    import pip
    installed_packages = pip.get_installed_distributions()
    return "tensorflow-gpu" in [p.project_name for p in installed_packages]


###################################################################################################################
## FILES LOGIC
################################################################################################################### 

def can_use_gpu():
    # Check that 'tensorflow-gpu' is installed on the current code-env
    import pip
    installed_packages = pip.get_installed_distributions()
    return "tensorflow-gpu" in [p.project_name for p in installed_packages]


###################################################################################################################
## FILES LOGIC
################################################################################################################### 

def _generate_software_info(self):
        os_version = self._prepare_for_json(platform.platform())
        installed_packages = [self._prepare_for_json(pack) for pack in pip.get_installed_distributions()]
        output = self._run_external_cmd("dpkg-query --list | grep indy")
        indy_packages = output.split(os.linesep)
        return {
            "Software": {
                "OS_version": os_version,
                "Installed_packages": installed_packages,
                # TODO add this field
                "Indy_packages": self._prepare_for_json(indy_packages),
            }
        } 

def get_uninstalled_project_names():
    try:
        import pip
        pkg_set = set(KNOWN_PKG_LIST)
        pathmeta_list = pip.get_installed_distributions()
        installed_set = set([meta.project_name for meta in pathmeta_list])
        uninstalled_set = pkg_set.difference(installed_set)
        uninstalled_list = list(uninstalled_set)
    except Exception as ex:
        print(ex)
        uninstalled_list = KNOWN_PKG_LIST
    return uninstalled_list 

def get_pip_installed():
    try:
        import pip
        pypkg_list = [item.key for item in pip.get_installed_distributions()]
        return pypkg_list
    except ImportError:
        #out, err, ret = shell('pip list')
        #if ret == 0:
        #    pypkg_list = [_.split(' ')[0] for  _ in out.split('\n')]
        return [] 

def show_version(scoring_version):
	''' Python version and library versions '''
	swrite('\n=== VERSIONS ===\n\n')
 	# Scoring program version
	swrite("Scoring program version: " + str(scoring_version) + "\n\n")
	# Python version
	swrite("Python version: " + version + "\n\n")
	# Give information on the version installed
	swrite("Versions of libraries installed:\n")
	map(swrite, sorted(["%s==%s\n" % (i.key, i.version) for i in lib()])) 

def show_version():
	# Python version and library versions
	swrite('\n=== VERSIONS ===\n\n')
	# Python version
	swrite("Python version: " + version + "\n\n")
	# Give information on the version installed
	swrite("Versions of libraries installed:\n")
	map(swrite, sorted(["%s==%s\n" % (i.key, i.version) for i in lib()])) 

def _safe_dist():
    for p in pip.get_installed_distributions():
        try:
            yield p.key, p.version
        except Exception:   # pragma    nocover
            pass 

def log_running_python_versions():
    logging.info("Python version: " + str(sys.version) + ", " + str(sys.version_info))  # () required in Python 3.

    installed_packages = pip.get_installed_distributions()
    installed_packages_list = sorted(["%s==%s" % (i.key, i.version) for i in installed_packages])
    logging.info("Installed Python modules: " + str(installed_packages_list)) 

def check_deps():
    # Fail if the 'co3' module is installed, this supersedes it
    packages = get_installed_distributions(local_only=True)
    # For each EggInfoDistribution, find its metadata
    for pkg in packages:
        try:
            distro = get_distribution(pkg.project_name)
            if distro.project_name == 'co3':
                print("This package replaces the 'co3' distribution.  Please 'pip uninstall co3' first.")
                sys.exit(1)
        except DistributionNotFound:
            pass 

def show_version(scoring_version):
	''' Python version and library versions '''
	swrite('\n=== VERSIONS ===\n\n')
 	# Scoring program version
	swrite("Scoring program version: " + str(scoring_version) + "\n\n")
	# Python version
	swrite("Python version: " + version + "\n\n")
	# Give information on the version installed
	swrite("Versions of libraries installed:\n")
	map(swrite, sorted(["%s==%s\n" % (i.key, i.version) for i in lib()])) 

def show_version():
	# Python version and library versions
	swrite('\n=== VERSIONS ===\n\n')
	# Python version
	swrite("Python version: " + version + "\n\n")
	# Give information on the version installed
	swrite("Versions of libraries installed:\n")
	map(swrite, sorted(["%s==%s\n" % (i.key, i.version) for i in lib()])) 

def show_version(scoring_version):
	''' Python version and library versions '''
	swrite('\n=== VERSIONS ===\n\n')
 	# Scoring program version
	swrite("Scoring program version: " + str(scoring_version) + "\n\n")
	# Python version
	swrite("Python version: " + version + "\n\n")
	# Give information on the version installed
	swrite("Versions of libraries installed:\n")
	map(swrite, sorted(["%s==%s\n" % (i.key, i.version) for i in lib()])) 

def show_version():
	# Python version and library versions
	swrite('\n=== VERSIONS ===\n\n')
	# Python version
	swrite("Python version: " + version + "\n\n")
	# Give information on the version installed
	swrite("Versions of libraries installed:\n")
	map(swrite, sorted(["%s==%s\n" % (i.key, i.version) for i in lib()])) 

def check_depdendencies():
    """
    Makes sure that all required dependencies are installed in the exact version
    (as specified in requirements.txt)
    """
    # Get installed packages
    installed_packages = pip.get_installed_distributions(local_only=False)
    installed_packages_list = sorted(["%s==%s" % (i.key, i.version) for i in installed_packages])

    # Now check if each package specified in requirements.txt is actually installed
    deps_filename = os.path.join(ROOT_INSTALL_PATH, "requirements.txt")
    with open(deps_filename, "r") as f:
        for dep in f.read().split():
            if not dep.lower() in installed_packages_list:
                raise SystemCheckError("Required dependency %s is not installed. Please run 'pip install -e .'" % dep) 

def main():
    """Use pip to find pip installed packages in a given prefix."""
    pip_packages = {}
    for package in pip.get_installed_distributions():
        name = package.project_name
        version = package.version
        full_name = "{0}-{1}-pip".format(name.lower(), version)
        pip_packages[full_name] = {'version': version}
    data = json.dumps(pip_packages)
    print(data) 

def Check(self):
        try:
            with warnings.catch_warnings():
                warnings.simplefilter("ignore")
                module = __import__(self.module)
        except ImportError:
            raise MissingDependency
        if self.attr and hasattr(module, self.attr):
            version = getattr(module, self.attr)
        elif hasattr(module, "__version__"):
            version = module.__version__
        elif hasattr(module, "VERSION"):
            version = module.VERSION
        elif hasattr(module, "version"):
            version = module.version
        else:
            result = [
                p.version
                for p in pip.get_installed_distributions()
                if str(p).startswith(self.name + " ")
            ]
            if result:
                version = result[0]
            else:
                raise Exception("Can't get version information")
        if not isinstance(version, basestring):
            version = ".".join(str(x) for x in version)
        if CompareVersion(version, self.version) < 0:
            raise WrongVersion 

def system():
    pywebdriver_info = []
    pywebdriver_info.append({
        'name': _('CORS allowed origins'),
        'value': config.get('flask','cors_origins')
    })
    system_info = []
    system_info.append({
        'name': _('OS - System'), 'value': platform.system()})
    system_info.append({
        'name': _('OS - Distribution'),
        'value': platform.linux_distribution()})
    system_info.append({
        'name': _('OS - Release'), 'value': platform.release()})
    system_info.append({
        'name': _('OS - Version'), 'value': platform.version()})
    system_info.append({
        'name': _('Machine'), 'value': platform.machine()})
    system_info.append({
        'name': _('Python Version'), 'value': platform.python_version()})
    installed_python_packages = get_installed_distributions()
    installed_python_packages = sorted(
        installed_python_packages, key=lambda package: package.key)
    return render_template(
        'system.html',
        pywebdriver_info=pywebdriver_info,
        system_info=system_info,
        installed_python_packages=installed_python_packages
    ) 

def step_cli_installed(context):
    """
    Make sure wharfee is in installed packages.
    """
    dists = set([di.key for di in pip.get_installed_distributions()])
    assert 'wharfee' in dists 

def is_latest(package_name):
    pypi = xmlrpc_client.ServerProxy('https://pypi.python.org/pypi')
    for dist in pip.get_installed_distributions():
        if dist.project_name == package_name:
            available = pypi.package_releases(dist.project_name)
            if available[0] != dist.version:
                return False
            return True 

def deps(ctx):
    repos = get_repos_from_requirements(ctx.obj['base_path'])
    required_versions = get_tag_from_repo_url(repos)
    latest_versions = get_latest_tags_from_repos(repos)
    installed_pkgs = pip.get_installed_distributions()
    click.echo('')
    for repo in repos:
        status = 'outdated'
        required = required_versions[repo]
        latest = latest_versions[repo]
        try:
            repo_small = repo.split('@')[1]
            pkg_name = repo.split('egg=')[1]
        except IndexError:
            continue
        pkg_name_normalized = pkg_name.lower().replace('_', '-')
        installed = 'unknown'
        installed_list = [
            pkg.version
            for pkg in installed_pkgs
            if pkg.key in [pkg_name_normalized, pkg_name_normalized + '-lib']
        ]
        if installed_list:
            installed = 'v{}'.format(installed_list[0])

        if latest is None or installed is None:
            continue

        if LooseVersion(installed) > LooseVersion(latest):
            status = 'develop'
        elif LooseVersion(installed) < LooseVersion(required):
            status = 'up-to-date (old version installed)'
        elif required == latest:
            status = 'up-to-date'
        msg = '{pkg_name}: {status} (required: {required}, installed: {installed}, latest: {latest})'.format(
            repo=repo_small, pkg_name=pkg_name_normalized, status=status, required=required, installed=installed, latest=latest)
        if status == 'up-to-date' or (status == 'develop' and installed == required):
            color = 'green'
        elif status in ('develop', 'up-to-date (old version installed)') or installed == latest:
            color = 'yellow'
        else:
            color = 'red'
        click.echo(click.style(msg, fg=color)) 

def update(ctx, install, install_all):
    base_path = ctx.obj['base_path']
    repos = get_repos_from_requirements(base_path)
    required_versions = get_tag_from_repo_url(repos)
    latest_versions = get_latest_tags_from_repos(repos)
    installed_pkgs = pip.get_installed_distributions()
    install_list = ['-e .']
    click.echo('')
    for repo in repos:
        latest = latest_versions[repo]
        required = required_versions[repo]
        try:
            pkg_name = repo.split('egg=')[1]
        except IndexError:
            continue
        pkg_name_normalized = pkg_name.lower().replace('_', '-')
        installed = 'unknown'
        installed_list = [
            pkg.version
            for pkg in installed_pkgs
            if pkg.key in [pkg_name_normalized, pkg_name_normalized + '-lib']
        ]
        if installed_list:
            installed = 'v{}'.format(installed_list[0])

        if LooseVersion(required) < LooseVersion(latest):
            click.echo('Updating {} from {} to {}...'.format(pkg_name, required, latest))
            new_repo = update_repo_tag(repo, latest, path=base_path)
            if LooseVersion(installed) < LooseVersion(latest):
                install_list.append(new_repo)
        elif LooseVersion(installed) < LooseVersion(required):
            install_list.append(repo)
    if install_all:
        install = True
        install_list = ['-r requirements.txt']
    if install:
        for new_repo in install_list:
            new_repo = new_repo.strip()
            click.echo('')
            click.echo('Running `pip install -U {}` ...'.format(new_repo))
            command = ['pip', 'install', '-U'] + new_repo.split(' ')
            exitcode = subprocess.call(command, cwd=base_path)
            if exitcode == 0:
                click.echo('Done.')
            else:
                click.echo('Failed.')
                sys.exit(exitcode) 

def check_dependency(self):
        list_deps = []
        missing_deps = []

        with open('requirements.txt') as f:
            list_deps = f.read().splitlines()

	dists = [d for d in pkg_resources.working_set]
	pip_list = sorted([(i.key) for i in dists])
        #pip_list = sorted([(i.key) for i in pip.get_installed_distributions()])

        for req_dep in list_deps:
            compare_char = ["==", ">=", "<=", ">", "<", "!="]
            for c in compare_char:
                if c in req_dep:
                    pkg = req_dep.split(c)
                    if pkg[0] not in pip_list:
                        missing_deps.append(req_dep)
                        break
                    else:
                        installed_ver = pkg_resources.get_distribution(pkg[0]).version
                        if self.get_truth(installed_ver, c, pkg[1]):
                            break
                        else:
                            missing_deps.append(req_dep)                            
                else:
                    if req_dep not in pip_list:
                        # Why this package is not in get_installed_distributions ?
                        if str(req_dep) == "argparse":
                            pass
                        else:
                            missing_deps.append(req_dep)

        missing_deps = set(missing_deps)
        if missing_deps:
            missing_deps_warning ="""
            You are missing a module required for Belati. In order to continue using Belati, please install them with:

            {}`pip install --upgrade --force-reinstall -r requirements.txt`{}

            or manually install missing modules with:

            {}`pip install --upgrade --force-reinstall {}`{}

            """

            log.console_log(missing_deps_warning.format(Y, W, Y, ' '.join(missing_deps), W))
            sys.exit() 

def main():
    args = _get_args()

    pkgs = get_installed_distributions(local_only=args.local_only,
                                       user_only=args.user_only)

    tree = PackageDAG.from_pkgs(pkgs)

    is_text_output = not any([args.json, args.json_tree, args.output_format])

    return_code = 0

    # Before any reversing or filtering, show warnings to console
    # about possibly conflicting or cyclic deps if found and warnings
    # are enabled (ie. only if output is to be printed to console)
    if is_text_output and args.warn != 'silence':
        conflicts = conflicting_deps(tree)
        if conflicts:
            render_conflicts_text(conflicts)
            print('-'*72, file=sys.stderr)

        cycles = cyclic_deps(tree)
        if cycles:
            render_cycles_text(cycles)
            print('-'*72, file=sys.stderr)

        if args.warn == 'fail' and (conflicts or cycles):
            return_code = 1

    # Reverse the tree (if applicable) before filtering, thus ensuring
    # that the filter will be applied on ReverseTree
    if args.reverse:
        tree = tree.reverse()

    show_only = set(args.packages.split(',')) if args.packages else None
    exclude = set(args.exclude.split(',')) if args.exclude else None

    if show_only is not None or exclude is not None:
        tree = tree.filter(show_only, exclude)

    if args.json:
        print(render_json(tree, indent=4))
    elif args.json_tree:
        print(render_json_tree(tree, indent=4))
    elif args.output_format:
        output = dump_graphviz(tree,
                               output_format=args.output_format,
                               is_reverse=args.reverse)
        print_graphviz(output)
    else:
        render_text(tree, args.all, args.freeze)

    return return_code 

def getpackages(self):
        """
        returns a list with the installed python packages and its versions
        """

        # check if pypi service is reachable
        if self.pypi_timeout <= 0:
            pypi_available = False
#            pypi_unavailable_message = translate('PyPI Prüfung deaktiviert')
            pypi_unavailable_message = 'PyPI Prüfung deaktiviert'
        else:
            pypi_available = True
            try:
                import socket
                sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
                sock.settimeout(self.pypi_timeout)
                #                sock.connect(('pypi.python.org', 443))
                sock.connect(('pypi.org', 443))
                sock.close()
            except:
                pypi_available = False
#                pypi_unavailable_message = translate('PyPI nicht erreichbar')
                pypi_unavailable_message = 'PyPI nicht erreichbar'

        import pip
        import xmlrpc
        installed_packages = pip.get_installed_distributions()
        #        pypi = xmlrpc.client.ServerProxy('https://pypi.python.org/pypi')
        pypi = xmlrpc.client.ServerProxy('https://pypi.org/pypi')
        packages = []
        for dist in installed_packages:
            package = {}
            package['key'] = dist.key
            package['version_installed'] = dist.version
            if pypi_available:
                try:
                    available = pypi.package_releases(dist.project_name)
                    try:
                        package['version_available'] = available[0]
                    except:
                        package['version_available'] = '-'
                except:
#                    package['version_available'] = [translate('Keine Antwort von PyPI')]
                    package['version_available'] = ['Keine Antwort von PyPI']
            else:
                package['version_available'] = pypi_unavailable_message
            packages.append(package)

        sorted_packages = sorted([(i['key'], i['version_installed'], i['version_available']) for i in packages])
        return sorted_packages