code: def authorize_url(self, state=None):
          '''
          Generate authorize_url.
  
          >>> GitHub(client_id='3ebf94c5776d565bcf75').authorize_url()
          'https://github.com/login/oauth/authorize?client_id=3ebf94c5776d565bcf75'
          '''
          if not self._client_id:
              raise ApiAuthError('No client id.')
          kw = dict(client_id=self._client_id)
          if self._redirect_uri:
              kw['redirect_uri'] = self._redirect_uri
          if self._scope:
              kw['scope'] = self._scope
          if state:
              kw['state'] = state
          return 'https://github.com/login/oauth/authorize?%s' % _encode_params(kwf authorize_url(self, state=None):
          '''
          Generate authorize_url.
  
          >>> GitHub(client_id='3ebf94c5776d565bcf75').authorize_url()
          'https://github.com/login/oauth/authorize?client_id=3ebf94c5776d565bcf75'
          '''
          if not self._client_id:
              raise ApiAuthError('No client id.')
          kw = dict(client_id=self._client_id)
          if self._redirect_uri:
              kw['redirect_uri'] = self._redirect_uri
          if self._scope:
              kw['scope'] = self._scope
          if state:
              kw['state'] = state
          return 'https://github.com/login/oauth/authorize?%s' % _encode_params(kw)
docs: Generate authorize_url.
  
          >>> GitHub(client_id='3ebf94c5776d565bcf75').authorize_url()
          'https://github.com/login/oauth/authorize?client_id=3ebf94c5776d565bcf75'