Index: Mk/Uses/trigger.mk
===================================================================
--- Mk/Uses/trigger.mk
+++ Mk/Uses/trigger.mk
@@ -10,20 +10,21 @@
 .if !defined(_INCLUDE_USES_TRIGGER_MK)
 _INCLUDE_USES_TRIGGER_MK=	yes
 
-.  if !empty(trigger_ARGS)
-IGNORE=	Incorrect 'USES+= trigger:${trigger_ARGS}' trigger takes no arguments
+_flavored=	#
+.  if !empty(trigger_ARGS:Mflavored)
+_flavored=	-${FLAVOR}
 .  endif
 
 TRIGGERS?=	${PORTNAME}
 .  for t in ${TRIGGERS}
 SUB_FILES+=	${t}.ucl
-PLIST_FILES+=	${LOCALBASE}/share/pkg/triggers/$t.ucl
+PLIST_FILES+=	${LOCALBASE}/share/pkg/triggers/$t${_flavored}.ucl
 .  endfor
 
 _USES_install+=	601:trigger-post-install
 trigger-post-install:
 	${MKDIR} ${STAGEDIR}${LOCALBASE}/share/pkg/triggers
 .  for t in ${TRIGGERS}
-	${INSTALL_DATA} ${WRKDIR}/$t.ucl ${STAGEDIR}${LOCALBASE}/share/pkg/triggers/
+	${INSTALL_DATA} ${WRKDIR}/$t.ucl ${STAGEDIR}${LOCALBASE}/share/pkg/triggers/$t${_flavored}.ucl
 .  endfor
 .endif
Index: lang/Makefile
===================================================================
--- lang/Makefile
+++ lang/Makefile
@@ -285,6 +285,7 @@
     SUBDIR += python-doc-pdf-letter
     SUBDIR += python-doc-text
     SUBDIR += python-mode.el
+    SUBDIR += python-pycache
     SUBDIR += python-tools
     SUBDIR += python2
     SUBDIR += python27
Index: lang/python-pycache/Makefile
===================================================================
--- /dev/null
+++ lang/python-pycache/Makefile
@@ -0,0 +1,26 @@
+PORTNAME=	python-pycache
+PORTVERSION=	0.0.1
+PKGNAMESUFFIX=	${PYTHON_PKGNAMESUFFIX}
+
+CATEGORIES=	lang
+
+MAINTAINER=	portmgr@FreeBSD.org
+COMMENT=	Trigger to recreate python precompiled bytecode
+
+USES=		metaport trigger:flavored python:env
+USE_PYTHON=	flavors
+TRIGGERS=	python-update-cache
+
+
+SUB_LIST=	PYTHON_CMD=${PYTHON_CMD} \
+		NEW_CACHE_CMD=${_NEW_CACHE_CMD}
+
+.include <bsd.port.pre.mk>
+
+.if ${PYTHON_VER:M3.7} || ${PYTHON_VER:M3.8}
+_NEW_CACHE_CMD=	false
+.else
+_NEW_CACHE_CMD=	true
+.endif
+
+.include <bsd.port.post.mk>
Index: lang/python-pycache/files/python-update-cache.ucl.in
===================================================================
--- /dev/null
+++ lang/python-pycache/files/python-update-cache.ucl.in
@@ -0,0 +1,93 @@
+path_glob: "%%PYTHON_SITELIBDIR%%/*"
+
+trigger: {
+	type: lua
+	sandbox: false
+	script: <<EOS
+function cleanup(directory)
+  if not pkg.stat(directory)  then
+    return
+  end
+  for _,d in ipairs(pkg.readdir(directory)) do
+    local full_path = directory .. "/" .. d
+    local stat = pkg.stat(full_path)
+    if stat and stat["type"] == "dir" then
+      if (not (d == "__pycache__")) then
+        cleanup(full_path)
+      else
+        for _,bytecode_file in ipairs(pkg.readdir(full_path)) do
+          local file_origin = string.gsub(bytecode_file, "[.]cpython[-]%d%d[.].*py[oc]", ".py")
+          if file_origin  then
+            local origin_path = directory .. "/" .. file_origin
+            if (not pkg.stat(origin_path)) then
+              os.remove(full_path .. "/" .. bytecode_file)
+            end
+          end
+        end
+        local res = pkg.readdir(full_path)
+        if res and #res == 0 then
+          os.remove(full_path)
+        end
+      end
+    end
+  end
+  -- check wheter the directory itself has become stale
+  local items = pkg.readdir(directory)
+  if items and #items == 0 then 
+    os.remove(directory)
+  end
+end
+
+function create(directory)
+   if %%NEW_CACHE_CMD%% then
+     pkg.exec({"%%PYTHON_CMD%%",        "-m", "compileall", "-q", "-o", "0", "-o", "1", "-o", "2", "%%PYTHON_SITELIBDIR%%"})
+   else
+     pkg.exec({"%%PYTHON_CMD%%",        "-m", "compileall", "-q", "%%PYTHON_SITELIBDIR%%"})
+     pkg.exec({"%%PYTHON_CMD%%", "-O",  "-m", "compileall", "-q", "%%PYTHON_SITELIBDIR%%"})
+     pkg.exec({"%%PYTHON_CMD%%", "-OO", "-m", "compileall", "-q", "%%PYTHON_SITELIBDIR%%"})
+   end
+end
+
+function top_level(directory)
+  local filename_idx = string.find(directory, "/[^/]*$")
+  local filename = string.sub(directory, filename_idx, #directory)
+  local check    = "%%PYTHON_SITELIBDIR%%" .. filename
+
+  return check == directory
+end
+
+function has_cache(directory)
+  local path = directory .. "/" .. "__pycache__"
+  local stat = pkg.stat(path)
+
+  return stat and stat["type"] == "dir"
+end
+
+if arg then
+   local to_clean = {}
+   local to_create = {}
+   -- filter the files passed by pkg to decide which paths to clean and to re-cache
+   for _, path in ipairs(arg) do
+     local stat = pkg.stat(path)
+     if stat then
+       if stat["type"] == "dir" then
+         table.insert(to_clean, path)
+         if top_level(path) and (not has_cache(path)) then
+           table.insert(to_create, path)
+         end
+       end
+     end
+   end
+   -- cleanup stale cache files
+   print("Cleaning Python bytecode files...")
+   for _, path in ipairs(to_clean) do
+      cleanup(path)
+   end
+   -- re-create cache
+   print("Creating Python bytecode files...")
+   for _, path in ipairs(to_create) do
+      create(path)
+   end
+end
+EOS
+}
Index: lang/python-pycache/pkg-descr
===================================================================
--- /dev/null
+++ lang/python-pycache/pkg-descr
@@ -0,0 +1 @@
+Recreates pycache on pkg registration.
Index: lang/python310/Makefile
===================================================================
--- lang/python310/Makefile
+++ lang/python310/Makefile
@@ -1,6 +1,6 @@
 PORTNAME=	python
 DISTVERSION=	${PYTHON_DISTVERSION}
-PORTREVISION=	2
+PORTREVISION=	4
 CATEGORIES=	lang python
 MASTER_SITES=	PYTHON/ftp/python/${DISTVERSION:C/[a-z].*//}
 PKGNAMESUFFIX=	${PYTHON_SUFFIX}
@@ -14,6 +14,7 @@
 LICENSE=	PSFL
 
 LIB_DEPENDS=	libffi.so:devel/libffi
+RUN_DEPENDS=	python-pycache${PYTHON_PKGNAMESUFFIX}>=0:lang/python-pycache@${PY_FLAVOR}
 
 USES=		compiler:c11 cpe ncurses pathfix pkgconfig \
 		python:${PYTHON_DISTVERSION:R},env readline shebangfix ssl tar:xz
Index: lang/python311/Makefile
===================================================================
--- lang/python311/Makefile
+++ lang/python311/Makefile
@@ -1,6 +1,6 @@
 PORTNAME=	python
 DISTVERSION=	${PYTHON_DISTVERSION}
-PORTREVISION=	2
+PORTREVISION=	4
 CATEGORIES=	lang python
 MASTER_SITES=	PYTHON/ftp/python/${DISTVERSION:C/[a-z].*//}
 PKGNAMESUFFIX=	${PYTHON_SUFFIX}
@@ -14,6 +14,7 @@
 LICENSE=	PSFL
 
 LIB_DEPENDS=	libffi.so:devel/libffi
+RUN_DEPENDS=	python-pycache${PYTHON_PKGNAMESUFFIX}>=0:lang/python-pycache@${PY_FLAVOR}
 
 USES=		compiler:c11 cpe ncurses pathfix pkgconfig \
 		python:${PYTHON_DISTVERSION:R},env readline shebangfix ssl tar:xz
Index: lang/python37/Makefile
===================================================================
--- lang/python37/Makefile
+++ lang/python37/Makefile
@@ -1,6 +1,6 @@
 PORTNAME=	python
 DISTVERSION=	${PYTHON_DISTVERSION}
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	lang python
 MASTER_SITES=	PYTHON/ftp/python/${DISTVERSION}
 PKGNAMESUFFIX=	${PYTHON_SUFFIX}
@@ -18,6 +18,7 @@
 
 LIB_DEPENDS=	libffi.so:devel/libffi \
 		libmpdec.so:math/mpdecimal
+RUN_DEPENDS=	python-pycache${PYTHON_PKGNAMESUFFIX}>=0:lang/python-pycache@${PY_FLAVOR}
 
 USES=		cpe ncurses pathfix pkgconfig python:${PYTHON_DISTVERSION:R},env readline \
 		shebangfix ssl tar:xz
Index: lang/python38/Makefile
===================================================================
--- lang/python38/Makefile
+++ lang/python38/Makefile
@@ -1,6 +1,6 @@
 PORTNAME=	python
 DISTVERSION=	${PYTHON_DISTVERSION}
-PORTREVISION=	2
+PORTREVISION=	4
 CATEGORIES=	lang python
 MASTER_SITES=	PYTHON/ftp/python/${DISTVERSION}
 PKGNAMESUFFIX=	${PYTHON_SUFFIX}
@@ -14,6 +14,7 @@
 LICENSE=	PSFL
 
 LIB_DEPENDS=	libffi.so:devel/libffi
+RUN_DEPENDS=	python-pycache${PYTHON_PKGNAMESUFFIX}>=0:lang/python-pycache@${PY_FLAVOR}
 
 USES=		cpe ncurses pathfix pkgconfig python:${PYTHON_DISTVERSION:R},env readline \
 		shebangfix ssl tar:xz
Index: lang/python39/Makefile
===================================================================
--- lang/python39/Makefile
+++ lang/python39/Makefile
@@ -1,6 +1,6 @@
 PORTNAME=	python
 DISTVERSION=	${PYTHON_DISTVERSION}
-PORTREVISION=	2
+PORTREVISION=	4
 CATEGORIES=	lang python
 MASTER_SITES=	PYTHON/ftp/python/${DISTVERSION}
 PKGNAMESUFFIX=	${PYTHON_SUFFIX}
@@ -14,6 +14,7 @@
 LICENSE=	PSFL
 
 LIB_DEPENDS=	libffi.so:devel/libffi
+RUN_DEPENDS=	python-pycache${PYTHON_PKGNAMESUFFIX}>=0:lang/python-pycache@${PY_FLAVOR}
 
 USES=		compiler:c11 cpe ncurses pathfix pkgconfig \
 		python:${PYTHON_DISTVERSION:R},env readline shebangfix ssl tar:xz