如果您在 *NIX操作系统（包括mac）下工作，您可以使用shell find命令，如下所示：

ROOT="./"
for DIR in $(find $ROOT -type d); do
    touch $DIR/__init__.py
done

或使用python脚本：

from os.path import isdir, walk, join

root = "/path/to/project"
finit = '__init__.py'
def visitor(arg, dirname, fnames):
    fnames = [fname for fname in fnames if isdir(fname)]
    # here you could do some additional checks ...
    print "adding %s to : %s" %(finit, dirname)
    with open(join(dirname, finit), 'w') as file_: file_.write('')

walk(root, visitor, None)

以下内容应给予变量AllPaths中所需的目录列表：

# Get paths to all .py files (relative to build dir)
file(GLOB_RECURSE SubDirs RELATIVE ${CMAKE_BINARY_DIR} "${CMAKE_BINARY_DIR}/*.py")
# Clear the variable AllPaths ready to take the list of results
set(AllPaths)
foreach(SubDir ${SubDirs})
  # Strip the filename from the path
  get_filename_component(SubDir ${SubDir} PATH)
  # Change the path to a semi-colon separated list
  string(REPLACE "/" ";" PathParts ${SubDir})
  # Incrementally rebuild path, appending each partial path to list of results
  set(RebuiltPath ${CMAKE_BINARY_DIR})
  foreach(PathPart ${PathParts})
    set(RebuiltPath "${RebuiltPath}/${PathPart}")
    set(AllPaths ${AllPaths} ${RebuiltPath})
  endforeach()
endforeach()
# Remove duplicates
list(REMOVE_DUPLICATES AllPaths)

下面是https://stackoverflow.com/a/11449316/827437中另一个答案的一行版本：
find $DIR -type d -exec touch {}/__init__.py \;
这将通过执行touch命令在$DIR的每个目录中创建一个__init__.py文件。运行find $DIR -type d查看将包含该文件的目录。