import requests

import cnrclient
from cnrclient.commands.command_base import CommandBase


class VersionCmd(CommandBase):
    name = 'version'
    help_message = "show versions"

    def __init__(self, options):
        super(VersionCmd, self).__init__(options)
        self.api_version = None
        self.client_version = None
        self.registry_host = options.registry_host

    @classmethod
    def _add_arguments(cls, parser):
        cls._add_registryhost_option(parser)

    def _api_version(self):
        api_version = None
        try:
            client = self.RegistryClient(self.registry_host)
            response = client.version()
            api_version = response
        except requests.exceptions.RequestException:
            api_version = ".. Connection error"
        return api_version

    def _cli_version(self):
        return cnrclient.__version__

    def _version(self):
        return {'api-version': self._api_version(),
                "client-version": self._cli_version()}

    def _call(self):
        version = self._version()
        self.api_version = version['api-version']
        self.client_version = version['client-version']

    def _render_dict(self):
        return {"api-version": self.api_version,
                "client-version": self.client_version}

    def _render_console(self):
        return "\n".join(["Api-version: %s" % self.api_version, "Client-version: %s" % self.client_version])

import requests

import cnrclient
from cnrclient.commands.command_base import CommandBase


class VersionCmd(CommandBase):
    name = 'version'
    help_message = "show versions"

    def __init__(self, options):
        super(VersionCmd, self).__init__(options)
        self.api_version = None
        self.client_version = None
        self.registry_host = options.registry_host

    @classmethod
    def _add_arguments(cls, parser):
        cls._add_registryhost_arg(parser)

    def _api_version(self):
        api_version = None
        try:
            client = self.RegistryClient(self.registry_host)
            response = client.version()
            api_version = response
        except requests.exceptions.RequestException:
            api_version = ".. Connection error"
        return api_version

    def _cli_version(self):
        return cnrclient.__version__

    def _version(self):
        return {'api-version': self._api_version(),
                "client-version": self._cli_version()}

    def _call(self):
        version = self._version()
        self.api_version = version['api-version']
        self.client_version = version['client-version']

    def _render_dict(self):
        return {"api-version": self.api_version,
                "client-version": self.client_version}

    def _render_console(self):
        return "\n".join(["Api-version: %s" % self.api_version, "Client-version: %s" % self.client_version])

Use registry arg option