diff --git a/modules/python/CMakeLists.txt b/modules/python/CMakeLists.txt
index a51acf386e..c6a9075224 100644
--- a/modules/python/CMakeLists.txt
+++ b/modules/python/CMakeLists.txt
@@ -20,11 +20,6 @@ add_subdirectory(bindings)
 
 add_subdirectory(test)
 
-if(NOT OPENCV_SKIP_PYTHON_LOADER)
-  include("./python_loader.cmake")
-  message(STATUS "OpenCV Python: during development append to PYTHONPATH: ${CMAKE_BINARY_DIR}/python_loader")
-endif()
-
 if(__disable_python2)
   ocv_module_disable_(python2)
 endif()
diff --git a/modules/python/bindings/CMakeLists.txt b/modules/python/bindings/CMakeLists.txt
index 442107b135..b39c679615 100644
--- a/modules/python/bindings/CMakeLists.txt
+++ b/modules/python/bindings/CMakeLists.txt
@@ -8,6 +8,10 @@ set(OPENCV_PYTHON_BINDINGS_DIR "${CMAKE_CURRENT_BINARY_DIR}" CACHE INTERNAL "")
 # This file is included from a subdirectory
 set(PYTHON_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../")
 
+if(NOT OPENCV_SKIP_PYTHON_LOADER)
+  include("${PYTHON_SOURCE_DIR}/python_loader.cmake")
+endif()
+
 # get list of modules to wrap
 set(OPENCV_PYTHON_MODULES)
 foreach(m ${OPENCV_MODULES_BUILD})
diff --git a/modules/python/common.cmake b/modules/python/common.cmake
index 251b78c6cb..ebbb2e2f65 100644
--- a/modules/python/common.cmake
+++ b/modules/python/common.cmake
@@ -1,31 +1,6 @@
 # This file is included from a subdirectory
 set(PYTHON_SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}")
 
-function(ocv_add_python_files_from_path search_path)
-  file(GLOB_RECURSE extra_py_files
-       RELATIVE "${search_path}"
-       # Plain Python code
-       "${search_path}/*.py"
-       # Type annotations
-       "${search_path}/*.pyi"
-  )
-  message(DEBUG "Extra Py files for ${search_path}: ${extra_py_files}")
-  if(extra_py_files)
-    list(SORT extra_py_files)
-    foreach(filename ${extra_py_files})
-      get_filename_component(module "${filename}" DIRECTORY)
-      if(NOT ${module} IN_LIST extra_modules)
-        list(APPEND extra_modules ${module})
-      endif()
-      configure_file("${search_path}/${filename}" "${__loader_path}/cv2/${filename}" COPYONLY)
-      install(FILES "${search_path}/${filename}" DESTINATION "${OPENCV_PYTHON_INSTALL_PATH}/cv2/${module}/" COMPONENT python)
-    endforeach()
-    message(STATUS "Found ${extra_modules} Python modules from ${search_path}")
-  else()
-    message(WARNING "Can't add Python files and modules from ${module_path}. There is no .py or .pyi files")
-  endif()
-endfunction()
-
 ocv_add_module(${MODULE_NAME} BINDINGS PRIVATE_REQUIRED opencv_python_bindings_generator)
 
 include_directories(SYSTEM
@@ -243,21 +218,6 @@ if(NOT OPENCV_SKIP_PYTHON_LOADER)
   endif()
   configure_file("${PYTHON_SOURCE_DIR}/package/template/config-x.y.py.in" "${__python_loader_install_tmp_path}/cv2/${__target_config}" @ONLY)
   install(FILES "${__python_loader_install_tmp_path}/cv2/${__target_config}" DESTINATION "${OPENCV_PYTHON_INSTALL_PATH}/cv2/" COMPONENT python)
-
-  # handle Python extra code
-  foreach(m ${OPENCV_MODULES_BUILD})
-    if (";${OPENCV_MODULE_${m}_WRAPPERS};" MATCHES ";python;" AND HAVE_${m}
-        AND EXISTS "${OPENCV_MODULE_${m}_LOCATION}/misc/python/package"
-    )
-      ocv_add_python_files_from_path("${OPENCV_MODULE_${m}_LOCATION}/misc/python/package")
-    endif()
-  endforeach(m)
-
-  if(NOT "${OCV_PYTHON_EXTRA_MODULES_PATH}" STREQUAL "")
-    foreach(extra_ocv_py_modules_path ${OCV_PYTHON_EXTRA_MODULES_PATH})
-      ocv_add_python_files_from_path(${extra_ocv_py_modules_path})
-    endforeach()
-  endif()
 endif()  # NOT OPENCV_SKIP_PYTHON_LOADER
 
 unset(PYTHON_SRC_DIR)
diff --git a/modules/python/package/cv2/__init__.py b/modules/python/package/cv2/__init__.py
index 80e2612276..07d1e0d21e 100644
--- a/modules/python/package/cv2/__init__.py
+++ b/modules/python/package/cv2/__init__.py
@@ -41,7 +41,7 @@ def __load_extra_py_code_for_module(base, name, enable_debug_print=False):
         setattr(py_module, "_native", native_module)
         for k, v in filter(lambda kv: not hasattr(py_module, kv[0]),
                            native_module.__dict__.items()):
-            if enable_debug_print: print('    symbol: {} = {}'.format(k, v))
+            if enable_debug_print: print('    symbol({}): {} = {}'.format(name, k, v))
             setattr(py_module, k, v)
     return True
 
@@ -51,6 +51,7 @@ def __collect_extra_submodules(enable_debug_print=False):
         return all((
              # module is not internal
              not module.startswith("_"),
+             not module.startswith("python-"),
              # it is not a file
              os.path.isdir(os.path.join(_extra_submodules_init_path, module))
         ))
diff --git a/modules/python/python3/CMakeLists.txt b/modules/python/python3/CMakeLists.txt
index 0bb401f2ec..d95af21e04 100644
--- a/modules/python/python3/CMakeLists.txt
+++ b/modules/python/python3/CMakeLists.txt
@@ -15,23 +15,9 @@ set(the_description "The python3 bindings")
 set(MODULE_NAME python3)
 set(MODULE_INSTALL_SUBDIR python3)
 
-set(_ocv_extra_modules_path ${CMAKE_CURRENT_LIST_DIR}/../package/extra_modules)
-set(_old_ocv_python_extra_modules_path ${OCV_PYTHON_EXTRA_MODULES_PATH})
-
-if("${OCV_PYTHON_EXTRA_MODULES_PATH}" STREQUAL "")
-  set(OCV_PYTHON_EXTRA_MODULES_PATH ${_ocv_extra_modules_path})
-else()
-  list(APPEND OCV_PYTHON_EXTRA_MODULES_PATH ${_ocv_extra_modules_path})
-endif()
-
-unset(_ocv_extra_modules_path)
-
 set(PYTHON PYTHON3)
 
 include(../common.cmake)
 
-set(OCV_PYTHON_EXTRA_MODULES_PATH ${_old_ocv_python_extra_modules_path})
-
-unset(_old_ocv_python_extra_modules_path)
 unset(MODULE_NAME)
 unset(MODULE_INSTALL_SUBDIR)
diff --git a/modules/python/python_loader.cmake b/modules/python/python_loader.cmake
index a872ffd763..670d85154c 100644
--- a/modules/python/python_loader.cmake
+++ b/modules/python/python_loader.cmake
@@ -22,6 +22,12 @@ else()
   set(CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE "os.path.join(LOADER_DIR, 'not_installed')")
 endif()
 
+if(OpenCV_FOUND)
+  return()  # Ignore "standalone" builds of Python bindings
+endif()
+
+
+
 set(PYTHON_LOADER_FILES
     "setup.py" "cv2/__init__.py"
     "cv2/load_config_py2.py" "cv2/load_config_py3.py"
@@ -39,34 +45,84 @@ foreach(fname ${PYTHON_LOADER_FILES})
   endif()
 endforeach()
 
-if(NOT OpenCV_FOUND)  # Ignore "standalone" builds of Python bindings
+
+
+if(WIN32)
+  if(CMAKE_GENERATOR MATCHES "Visual Studio")
+    list(APPEND CMAKE_PYTHON_BINARIES_PATH "'${EXECUTABLE_OUTPUT_PATH}/Release'")  # TODO: CMAKE_BUILD_TYPE is not defined
+  else()
+    list(APPEND CMAKE_PYTHON_BINARIES_PATH "'${EXECUTABLE_OUTPUT_PATH}'")
+  endif()
+else()
+  list(APPEND CMAKE_PYTHON_BINARIES_PATH "'${LIBRARY_OUTPUT_PATH}'")
+endif()
+string(REPLACE ";" ",\n    " CMAKE_PYTHON_BINARIES_PATH "${CMAKE_PYTHON_BINARIES_PATH}")
+configure_file("${PYTHON_SOURCE_DIR}/package/template/config.py.in" "${__loader_path}/cv2/config.py" @ONLY)
+
+
+
+# install
+if(DEFINED OPENCV_PYTHON_INSTALL_PATH)
   if(WIN32)
-    if(CMAKE_GENERATOR MATCHES "Visual Studio")
-      list(APPEND CMAKE_PYTHON_BINARIES_PATH "'${EXECUTABLE_OUTPUT_PATH}/Release'")  # TODO: CMAKE_BUILD_TYPE is not defined
-    else()
-      list(APPEND CMAKE_PYTHON_BINARIES_PATH "'${EXECUTABLE_OUTPUT_PATH}'")
-    endif()
+    list(APPEND CMAKE_PYTHON_BINARIES_INSTALL_PATH "os.path.join(${CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE}, '${OPENCV_BIN_INSTALL_PATH}')")
   else()
-    list(APPEND CMAKE_PYTHON_BINARIES_PATH "'${LIBRARY_OUTPUT_PATH}'")
+    list(APPEND CMAKE_PYTHON_BINARIES_INSTALL_PATH "os.path.join(${CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE}, '${OPENCV_LIB_INSTALL_PATH}')")
   endif()
-  string(REPLACE ";" ",\n    " CMAKE_PYTHON_BINARIES_PATH "${CMAKE_PYTHON_BINARIES_PATH}")
-  configure_file("${PYTHON_SOURCE_DIR}/package/template/config.py.in" "${__loader_path}/cv2/config.py" @ONLY)
-
-  # install
-  if(DEFINED OPENCV_PYTHON_INSTALL_PATH)
-    if(WIN32)
-      list(APPEND CMAKE_PYTHON_BINARIES_INSTALL_PATH "os.path.join(${CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE}, '${OPENCV_BIN_INSTALL_PATH}')")
-    else()
-      list(APPEND CMAKE_PYTHON_BINARIES_INSTALL_PATH "os.path.join(${CMAKE_PYTHON_EXTENSION_INSTALL_PATH_BASE}, '${OPENCV_LIB_INSTALL_PATH}')")
+  set(CMAKE_PYTHON_BINARIES_PATH "${CMAKE_PYTHON_BINARIES_INSTALL_PATH}")
+  if (WIN32 AND HAVE_CUDA)
+    if (DEFINED CUDA_TOOLKIT_ROOT_DIR)
+      list(APPEND CMAKE_PYTHON_BINARIES_PATH "os.path.join(os.getenv('CUDA_PATH', '${CUDA_TOOLKIT_ROOT_DIR}'), 'bin')")
     endif()
-    set(CMAKE_PYTHON_BINARIES_PATH "${CMAKE_PYTHON_BINARIES_INSTALL_PATH}")
-    if (WIN32 AND HAVE_CUDA)
-      if (DEFINED CUDA_TOOLKIT_ROOT_DIR)
-        list(APPEND CMAKE_PYTHON_BINARIES_PATH "os.path.join(os.getenv('CUDA_PATH', '${CUDA_TOOLKIT_ROOT_DIR}'), 'bin')")
+  endif()
+  string(REPLACE ";" ",\n    " CMAKE_PYTHON_BINARIES_PATH "${CMAKE_PYTHON_BINARIES_PATH}")
+  configure_file("${PYTHON_SOURCE_DIR}/package/template/config.py.in" "${__python_loader_install_tmp_path}/cv2/config.py" @ONLY)
+  install(FILES "${__python_loader_install_tmp_path}/cv2/config.py" DESTINATION "${OPENCV_PYTHON_INSTALL_PATH}/cv2/" COMPONENT python)
+endif()
+
+
+
+#
+# Handle Python extra code (submodules)
+#
+function(ocv_add_python_files_from_path search_path)
+  file(GLOB_RECURSE extra_py_files
+       RELATIVE "${search_path}"
+       # Plain Python code
+       "${search_path}/*.py"
+       # Type annotations
+       "${search_path}/*.pyi"
+  )
+  ocv_debug_message("Extra Py files for ${search_path}: ${extra_py_files}")
+  if(extra_py_files)
+    list(SORT extra_py_files)
+    foreach(filename ${extra_py_files})
+      get_filename_component(module "${filename}" DIRECTORY)
+      if(NOT ${module} IN_LIST extra_modules)
+        list(APPEND extra_modules ${module})
       endif()
-    endif()
-    string(REPLACE ";" ",\n    " CMAKE_PYTHON_BINARIES_PATH "${CMAKE_PYTHON_BINARIES_PATH}")
-    configure_file("${PYTHON_SOURCE_DIR}/package/template/config.py.in" "${__python_loader_install_tmp_path}/cv2/config.py" @ONLY)
-    install(FILES "${__python_loader_install_tmp_path}/cv2/config.py" DESTINATION "${OPENCV_PYTHON_INSTALL_PATH}/cv2/" COMPONENT python)
+      configure_file("${search_path}/${filename}" "${__loader_path}/cv2/${filename}" COPYONLY)
+      if(DEFINED OPENCV_PYTHON_INSTALL_PATH)
+        install(FILES "${search_path}/${filename}" DESTINATION "${OPENCV_PYTHON_INSTALL_PATH}/cv2/${module}/" COMPONENT python)
+      endif()
+    endforeach()
+    message(STATUS "Found '${extra_modules}' Python modules from ${search_path}")
+  else()
+    message(WARNING "Can't add Python files and modules from '${module_path}'. There is no .py or .pyi files")
   endif()
+endfunction()
+
+ocv_add_python_files_from_path("${PYTHON_SOURCE_DIR}/package/extra_modules")
+
+foreach(m ${OPENCV_MODULES_BUILD})
+  if (";${OPENCV_MODULE_${m}_WRAPPERS};" MATCHES ";python;" AND HAVE_${m}
+      AND EXISTS "${OPENCV_MODULE_${m}_LOCATION}/misc/python/package"
+  )
+    ocv_add_python_files_from_path("${OPENCV_MODULE_${m}_LOCATION}/misc/python/package")
+  endif()
+endforeach(m)
+
+if(NOT "${OPENCV_PYTHON_EXTRA_MODULES_PATH}" STREQUAL "")
+  foreach(extra_ocv_py_modules_path ${OPENCV_PYTHON_EXTRA_MODULES_PATH})
+    ocv_add_python_files_from_path(${extra_ocv_py_modules_path})
+  endforeach()
 endif()