TL: trying to solve circular imports

Author: tlunet

pySDC/core/sweeper.py

@@ -3,7 +3,6 @@
 from qmat.qdelta import QDeltaGenerator, QDELTA_GENERATORS
 
 from pySDC.core.errors import ParameterError
-from pySDC.core.level import Level
 from pySDC.core.collocation import CollBase
 from pySDC.helpers.pysdc_helper import FrozenClass
 
@@ -245,6 +244,8 @@ def level(self, L):
         Args:
             L (pySDC.Level.level): current level
         """
+        from pySDC.core.level import Level
+
         assert isinstance(L, Level)
         self.__level = L