Use yapf3 and add to CI

.github/workflows/clang-format.yml

@@ -27,14 +27,14 @@ jobs:
           CI_BUILD_STAGE_NAME: build
         run: |
           bash ci/ci-install.bash &&
-          sudo apt-get install clang-10 &&
+          sudo apt-get install clang-10 yapf3 &&
           git config --global user.email "action@example.com" &&
           git config --global user.name "github action"
       - name: Format code
         run: |
           autoconf &&
           ./configure &&
-          make clang-format CLANGFORMAT=clang-format-10 &&
+          make -j 2 format CLANGFORMAT=clang-format-10 &&
           git status
       - name: Push
         run: |

Makefile.in

@@ -472,7 +472,7 @@ clang-format:
 		|| echo "*** You are not using clang-format 10.0, indents may differ from master's ***"
 	$(CLANGFORMAT) $(CLANGFORMAT_FLAGS) $(CLANGFORMAT_FILES)
 
-YAPF = yapf
+YAPF = yapf3
 YAPF_FLAGS = -i
 YAPF_FILES = \
 	nodist/fuzzer/actual_fail \

docs/internals.adoc

@@ -409,8 +409,9 @@ style indentation; the `c-set-style` undoes that.)
 
 * Comment every member variable.
 
-Indentation is automatically maintained with "make clang-format" (using
-clang-format version 10.0.0).  For those manually formatting:
+Indentation is automatically maintained with "make format" using
+clang-format version 10.0.0, and yapf for python, and is automatically
+corrected in the CI actions.  For those manually formatting C++ code:
 
 * Use 4 spaces per level, and no tabs.