Flatbuffers Python Object API (#5616)

* Flatbuffers Python Object API

Implement the logic to generate the Python object API that can
unpack the data from a buf class into an object class, and pack
the data of an object class to a buf class.

* Fix the build issues

Remove unused parameters and replace auto in the for-loop statement
with std::string to make it compatible with VS2010.

* Fix the build issues.

* Add support for Array type

Added logic to handle Array type in Python Object API. Updated the
generated code accordingly.

* Fix the old style casting from int to char

* Fixed another conversion from int to char

* Fixed the import for typing

Importing typing may cause errors when a machine do not have the
moduel typing installed. This PR fixes the issue by guarding
"import typing" with the "try/except" statement.

* Fix issue of iterating the vector of import list

* Update the generated examples using generate_code.sh

* Fix the import order for typing

The import list was stored in unordered_set, so that each generated
codes may have different import order. Therefore, it failed in the
consistency test where two generated copies need to have exactly the
same apperance.

* Optimize unpack using numpy

Use numpy to unpack vector whenever it is possible to improve unpack
performance.

Also, added codegen command for Python specificly in generate_code.sh,
because --no-includes cannot be turn on for Python.

* Fix the import order

* Update generate_code.bat for windows accordingly

* Replace error message with pass

Avoid printing error message for every Python2 users about typing.
Replace it with pass.

1 files changed, 15 insertions, 0 deletions

diff --git a/tests/MyGame/Example/AnyAmbiguousAliases.py b/tests/MyGame/Example/AnyAmbiguousAliases.py
index de6e9d0e..3fb4830f 100644
--- a/tests/MyGame/Example/AnyAmbiguousAliases.py
+++ b/tests/MyGame/Example/AnyAmbiguousAliases.py
@@ -8,3 +8,18 @@ class AnyAmbiguousAliases(object):
     M2 = 2
     M3 = 3
 
+
+def AnyAmbiguousAliasesCreator(unionType, table):
+    from flatbuffers.table import Table
+    if not isinstance(table, Table):
+        return None
+    if unionType == AnyAmbiguousAliases().M1:
+        import MyGame.Example.Monster
+        return MyGame.Example.Monster.MonsterT.InitFromBuf(table.Bytes, table.Pos)
+    if unionType == AnyAmbiguousAliases().M2:
+        import MyGame.Example.Monster
+        return MyGame.Example.Monster.MonsterT.InitFromBuf(table.Bytes, table.Pos)
+    if unionType == AnyAmbiguousAliases().M3:
+        import MyGame.Example.Monster
+        return MyGame.Example.Monster.MonsterT.InitFromBuf(table.Bytes, table.Pos)
+    return None