Python: Fix importing .gb or .gba before .core

CHANGES

@@ -1,3 +1,7 @@
+0.6.1: (Future)
+Bugfixes:
+ - Python: Fix importing .gb or .gba before .core
+
 0.6.0: (2017-07-16)
 Features:
  - Library view

src/platform/python/mgba/core.py

@@ -39,6 +39,12 @@ def needsReset(f):
     return wrapper
 
 class Core(object):
+    if hasattr(lib, 'PLATFORM_GBA'):
+        PLATFORM_GBA = lib.PLATFORM_GBA
+
+    if hasattr(lib, 'PLATFORM_GB'):
+        PLATFORM_GB = lib.PLATFORM_GB
+
     def __init__(self, native):
         self._core = native
         self._wasReset = False
@@ -54,8 +60,10 @@ class Core(object):
         if not success:
             raise RuntimeError("Failed to initialize core")
         if hasattr(cls, 'PLATFORM_GBA') and core.platform(core) == cls.PLATFORM_GBA:
+            from .gba import GBA
             return GBA(core)
         if hasattr(cls, 'PLATFORM_GB') and core.platform(core) == cls.PLATFORM_GB:
+            from .gb import GB
             return GB(core)
         return Core(core)
 
@@ -151,12 +159,3 @@ class Core(object):
         code = ffi.new("char[12]")
         self._core.getGameCode(self._core, code)
         return ffi.string(code, 12).decode("ascii")
-
-if hasattr(lib, 'PLATFORM_GBA'):
-    from .gba import GBA
-    Core.PLATFORM_GBA = lib.PLATFORM_GBA
-
-if hasattr(lib, 'PLATFORM_GB'):
-    from .gb import GB
-    from .lr35902 import LR35902Core
-    Core.PLATFORM_GB = lib.PLATFORM_GB