fixed python data_driver

hikyuu/data_driver/__init__.py

@@ -47,13 +47,3 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 """
-
-from .data_driver import (DataDriverFactory,
-                          BaseInfoDriver,
-                          BlockInfoDriver,
-                          KDataDriver)
-
-__all__ = ['DataDriverFactory', 
-           'BaseInfoDriver', 
-           'BlockInfoDriver',
-           'KDataDriver']

hikyuu/data_driver/jqdata_data_driver.py

@@ -43,6 +43,9 @@ class jqdataKDataDriver(KDataDriver):
     def __init__(self):
         super(jqdataKDataDriver, self).__init__('jqdata')
 
+    def clone(self):
+        return jqdataKDataDriver()
+
     def _init(self):
         """【重载接口】（可选）初始化子类私有变量"""
         self._max = {

hikyuu/data_driver/pytdx_data_driver.py

@@ -45,6 +45,9 @@ class PytdxKDataDriver(KDataDriver):
     def __init__(self):
         super(PytdxKDataDriver, self).__init__('pytdx')
 
+    def _clone(self):
+        return PytdxKDataDriver()
+
     def _init(self):
         """【重载接口】（可选）初始化子类私有变量"""
         self._max = {