adding code to support optional type abbreviation request

fire/inspectutils.py

@@ -23,6 +23,7 @@
 import types
 
 from fire import docstrings
+from typing import get_args
 
 import six
 
@@ -143,7 +144,6 @@ def Py3GetFullArgSpec(fn):
 
   if sig.return_annotation is not sig.empty:
     annotations['return'] = sig.return_annotation
-
   for param in sig.parameters.values():
     kind = param.kind
     name = param.name
@@ -165,6 +165,8 @@ def Py3GetFullArgSpec(fn):
       varkw = name
     if param.annotation is not param.empty:
       annotations[name] = param.annotation
+      if "Optional" in str(annotations[name]) or "Union" in str(annotations[name]):
+        annotations[name] = ", ".join(x.__name__ for x in get_args(annotations[name]))
     # pylint: enable=protected-access
 
   if not kwdefaults:

fire/test_components.py

@@ -98,7 +98,7 @@ def double(self, count=0):
       count: Input number that you want to double.
 
     Returns:
-      A number that is the double of count.s
+      A number that is the double of count.
     """
     return 2 * count
 

fire/test_components_py3.py

@@ -67,7 +67,7 @@ def double(self, count: float) -> float:
       count: Input number that you want to double.
 
     Returns:
-      A number that is the double of count.s
+      A number that is the double of count.
     """
     return 2 * count
 
@@ -89,7 +89,7 @@ def double(self, count: float = 0) -> float:
       count: Input number that you want to double.
 
     Returns:
-      A number that is the double of count.s
+      A number that is the double of count.
     """
     return 2 * count