bpo-34890: Make iscoroutinefunction, isgeneratorfunction and isasyncgenfunction work with functools.partial (GH-9903)

inspect.isfunction() processes both inspect.isfunction(func) and
inspect.isfunction(partial(func, arg)) correctly but some other functions in the
inspect module (iscoroutinefunction, isgeneratorfunction and isasyncgenfunction)
lack this functionality. This commits adds a new check in the mentioned functions
in the inspect module so they can work correctly with arbitrarily nested partial
functions. 

1 files changed, 12 insertions, 0 deletions

diff --git a/Doc/library/inspect.rst b/Doc/library/inspect.rst
index 50cd003..dfd78a9 100644
--- a/Doc/library/inspect.rst
+++ b/Doc/library/inspect.rst
@@ -298,6 +298,10 @@ attributes:
 
    Return true if the object is a Python generator function.
 
+   .. versionchanged:: 3.8
+      Functions wrapped in :func:`functools.partial` now return true if the
+      wrapped function is a Python generator function.
+
 
 .. function:: isgenerator(object)
 
@@ -311,6 +315,10 @@ attributes:
 
    .. versionadded:: 3.5
 
+   .. versionchanged:: 3.8
+      Functions wrapped in :func:`functools.partial` now return true if the
+      wrapped function is a :term:`coroutine function`.
+
 
 .. function:: iscoroutine(object)
 
@@ -352,6 +360,10 @@ attributes:
 
    .. versionadded:: 3.6
 
+   .. versionchanged:: 3.8
+      Functions wrapped in :func:`functools.partial` now return true if the
+      wrapped function is a :term:`asynchronous generator` function.
+
 
 .. function:: isasyncgen(object)