Completes the new packages "joints" with the defined joints.

pylinkage/__init__.py

@@ -23,15 +23,16 @@
 from .interface import (
     UnbuildableError,
     HypostaticError,
-    Static,
+    NotCompletelyDefinedError,
     Pivot,
-    Crank,
-    Fixed,
-    Linkage
+    Linkage,
 )
 from .joints import (
+    Crank,
+    Fixed,
     Linear,
     Revolute,
+    Static,
 )
 from .optimization import (
     generate_bounds,

pylinkage/interface/__init__.py

@@ -6,10 +6,13 @@
     HypostaticError,
     NotCompletelyDefinedError,
 )
-from .joint import (
+from ..joints import (
     Static,
+    Revolute,
     Crank,
+    Linear,
     Fixed,
 )
-from ..joints.revolute import Revolute, Pivot
+# Will be deleted in next major release
+from ..joints.revolute import Pivot
 from .linkage import Linkage

pylinkage/interface/linkage.py

@@ -10,12 +10,7 @@
 import warnings
 from math import gcd, tau
 from .exceptions import HypostaticError
-from .joint import (
-    Static,
-    Crank,
-    Fixed
-)
-from ..joints import Revolute
+from ..joints import (Revolute, Fixed, Crank, Static)
 
 
 class Linkage:

pylinkage/joints/__init__.py

@@ -1,6 +1,7 @@
 """Definition of joints."""
 
+from .joint import Static
+from .crank import Crank
+from .fixed import Fixed
 from .linear import Linear
 from .revolute import Revolute
-
-from ..interface.joint import (Static, Fixed, Crank,)