Rename is in progress

returns/functions.py

@@ -6,10 +6,15 @@
 from returns.result import Failure, Success
 
 
-def is_successful(monad):
-    """Determins if a monad was a success or not."""
+def is_successful(container):
+    """
+    Determins if a container was successful or not.
+
+    We treat container that raise ``UnwrapFailedError`` on ``.unwrap()``
+    not successful.
+    """
     try:
-        monad.unwrap()
+        container.unwrap()
     except UnwrapFailedError:
         return False
     else:

returns/functions.pyi

@@ -7,20 +7,20 @@ from returns.result import Result
 
 _ContainerType = TypeVar('_ContainerType', bound=Container)
 _ReturnType = TypeVar('_ReturnType')
-_ReturnsMonadType = TypeVar(
-    '_ReturnsMonadType',
+_ReturnsContainerType = TypeVar(
+    '_ReturnsContainerType',
     bound=Callable[..., Container],
 )
 
 
-def is_successful(monad: _ContainerType) -> bool:
+def is_successful(container: _ContainerType) -> bool:
     ...
 
 
 # Typing decorators is not an easy task, see:
 # https://github.com/python/mypy/issues/3157
 
-def pipeline(function: _ReturnsMonadType) -> _ReturnsMonadType:
+def pipeline(function: _ReturnsContainerType) -> _ReturnsContainerType:
     ...