Implement missing python special methods. (#467)

Author: JulienPalard

snippets/python-mode/__aenter__

@@ -0,0 +1,8 @@
+# -*- mode: snippet -*-
+# name: __aenter__
+# key: _aenter
+# group: Special methods
+# --
+async def __aenter__(self):
+    $0
+    return self

snippets/python-mode/__aexit__

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: __aexit__
+# key: _aexit
+# group: Special methods
+# --
+async def __aexit__(self, exc_type, exc_value, traceback):
+    $0

snippets/python-mode/__aiter__

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: __aiter__
+# key: _aiter
+# group: Special methods
+# --
+def __aiter__(self):
+    return $0

snippets/python-mode/__anext__

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: __anext__
+# key: _anext
+# group: Special methods
+# --
+async def __anext__(self):
+    return $0

snippets/python-mode/__await__

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: __await__
+# key: _await
+# group: Special methods
+# --
+def __await__(self):
+    $0

snippets/python-mode/__bytes__

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: __bytes__
+# key: _bytes
+# group: Special methods
+# --
+def __bytes__(self):
+    return $0

snippets/python-mode/__ceil__

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: __ceil__
+# key: _ceil
+# group: Special methods
+# --
+def __ceil__(self):
+    return $0

snippets/python-mode/__class_getitem__

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: __class_getitem__
+# key: _class_getitem
+# group: Special methods
+# --
+def __class_getitem__(cls, key):
+    return $0

snippets/python-mode/__dir__

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: __dir__
+# key: _dir
+# group: Special methods
+# --
+def __dir__(self):
+    return $0

snippets/python-mode/__floor__

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: __floor__
+# key: _floor
+# group: Special methods
+# --
+def __floor__(self):
+    return $0