Enable --gen-onefile in Python (#6953)

* Enable --gen-onefile in Python

Made it possible to generate all python code in one file. Modified
py_test.py so that it can switch between the multi-file code and
the one-file code.

Updated PythonTest.sh and py_test.py so that the multi-file code
and the one-file code can be tested based on the same test code.

* Sync with google/flatbuffers

* Add --gen-onefile to generate_code.py

tests/MyGame/Example/Any.py

@@ -8,7 +8,6 @@ class Any(object):
     TestSimpleTableWithEnum = 2
     MyGame_Example2_Monster = 3
 
-
 def AnyCreator(unionType, table):
     from flatbuffers.table import Table
     if not isinstance(table, Table):

tests/MyGame/Example/AnyAmbiguousAliases.py

@@ -8,7 +8,6 @@ class AnyAmbiguousAliases(object):
     M2 = 2
     M3 = 3
 
-
 def AnyAmbiguousAliasesCreator(unionType, table):
     from flatbuffers.table import Table
     if not isinstance(table, Table):

tests/MyGame/Example/AnyUniqueAliases.py

@@ -8,7 +8,6 @@ class AnyUniqueAliases(object):
     TS = 2
     M2 = 3
 
-
 def AnyUniqueAliasesCreator(unionType, table):
     from flatbuffers.table import Table
     if not isinstance(table, Table):

tests/MyGame/Example/Color.py

@@ -10,4 +10,3 @@ class Color(object):
     Green = 2
     # \brief color Blue (1u << 3)
     Blue = 8
-

tests/MyGame/Example/Race.py

@@ -7,4 +7,3 @@ class Race(object):
     Human = 0
     Dwarf = 1
     Elf = 2
-

tests/MyGame/Example/TestEnum.py

@@ -6,4 +6,3 @@ class TestEnum(object):
     A = 0
     B = 1
     C = 2
-

tests/PythonTest.sh

@@ -21,6 +21,7 @@ runtime_library_dir=${test_dir}/../python
 
 # Emit Python code for the example schema in the test dir:
 ${test_dir}/../flatc -p -o ${gen_code_path} -I include_test monster_test.fbs --gen-object-api
+${test_dir}/../flatc -p -o ${gen_code_path} -I include_test monster_test.fbs --gen-object-api --gen-onefile
 ${test_dir}/../flatc -p -o ${gen_code_path} -I include_test monster_extra.fbs --gen-object-api
 
 # Syntax: run_tests <interpreter> <benchmark vtable dedupes>
@@ -35,7 +36,7 @@ function run_tests() {
     JYTHONPATH=${runtime_library_dir}:${gen_code_path} \
     COMPARE_GENERATED_TO_GO=0 \
     COMPARE_GENERATED_TO_JAVA=0 \
-    $1 py_test.py $2 $3 $4
+    $1 py_test.py $2 $3 $4 $5
     if [ $1 = python3 ]; then
       PYTHONDONTWRITEBYTECODE=1 \
       PYTHONPATH=${runtime_library_dir}:${gen_code_path} \
@@ -47,10 +48,12 @@ function run_tests() {
 }
 
 # Run test suite with these interpreters. The arguments are benchmark counts.
-run_tests python2.6 100 100 100
-run_tests python2.7 100 100 100
-run_tests python3 100 100 100
-run_tests pypy 100 100 100
+run_tests python2.6 100 100 100 false
+run_tests python2.7 100 100 100 false
+run_tests python2.7 100 100 100 true
+run_tests python3 100 100 100 false
+run_tests python3 100 100 100 true
+run_tests pypy 100 100 100 false
 
 # NOTE: We'd like to support python2.5 in the future.
 

tests/namespace_test/NamespaceA/NamespaceB/EnumInNestedNS.py

@@ -6,4 +6,3 @@ class EnumInNestedNS(object):
     A = 0
     B = 1
     C = 2
-

tests/namespace_test/NamespaceA/NamespaceB/UnionInNestedNS.py

@@ -6,7 +6,6 @@ class UnionInNestedNS(object):
     NONE = 0
     TableInNestedNS = 1
 
-
 def UnionInNestedNSCreator(unionType, table):
     from flatbuffers.table import Table
     if not isinstance(table, Table):