diff --git a/.vscode/settings.json b/.vscode/settings.json
index a004a86..4d6507c 100755
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -65,11 +65,22 @@
     ],
     "python.pythonPath": "venv2/bin/python",
     "python.formatting.provider": "yapf",
-    "python.languageServer": "Microsoft",
+    "python.formatting.yapfArgs": [
+        "--style", "{based_on_style: pep8 ,indent_width: 4, column_limit: 130}",
+    ],
+    "python.languageServer": "Jedi",
+    // "python.languageServer": "Microsoft",
     // "python.languageServer": "Pylance",
-    "python.linting.pylintEnabled": false,
+    "python.linting.enabled": true,
     "python.linting.flake8Enabled": true,
-    "python.linting.flake8Args": ["--max-line-length=250"],
+    "python.linting.flake8Args": [
+        "--max-line-length=250",
+        "--ignore=E251",
+        "--verbose",
+    ],
+    "python.linting.ignorePatterns": [".vscode/*.py", "**/site-packages/**/*.py"],
+    "python.linting.lintOnSave": true,
+    "python.linting.pylintEnabled": false,
     "python.testing.unittestArgs": [
         "-v",
         "-s",
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..c74aced
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,19 @@
+Copyright (c) 2016 The Python Packaging Authority (PyPA)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..ec8777d
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,10 @@
+# https://packaging.python.org/guides/using-manifest-in/
+
+include pyproject.toml
+
+# Include the README
+include *.md
+
+# Include the license file
+include LICENSE.txt
+
diff --git a/README.md b/README.md
index a90f8f8..831cf88 100644
--- a/README.md
+++ b/README.md
@@ -1,25 +1,97 @@
-
 # Python-DeMo
 
-Python DeMo
+![Python Logo](https://www.python.org/static/community_logos/python-logo.png "Python DeMo")
 
 - [一. 构建`venv`环境](#一-构建venv环境)
   - [1.1 venv2](#11-venv2)
     - [1.1.1 venv2 for mac](#111-venv2-for-mac)
+      - [1.1.1.1 venv2 16.7.5](#1111-venv2-1675)
+      - [1.1.1.2 venv2 20.4.6](#1112-venv2-2046)
     - [1.1.2 venv2 for windows](#112-venv2-for-windows)
   - [1.2 venv3](#12-venv3)
     - [1.2.1 venv3 for mac](#121-venv3-for-mac)
+      - [1.2.1.1 venv3 16.7.5](#1211-venv3-1675)
+      - [1.2.1.2 venv3 20.4.6](#1212-venv3-2046)
     - [1.2.2 venv3 for windows](#122-venv3-for-windows)
 - [二. 多模块配置](#二-多模块配置)
+- [三. venvX activate and deactivate](#三-venvx-activate-and-deactivate)
+  - [3.1 venvX activate](#31-venvx-activate)
+    - [3.1.1 activate for mac](#311-activate-for-mac)
+    - [3.1.2 activate for windows](#312-activate-for-windows)
+- [四. 脚本](#四-脚本)
+  - [4.1 python version](#41-python-version)
+  - [4.2 pip setuptools wheel version](#42-pip-setuptools-wheel-version)
+    - [4.2.1 pip freeze list](#421-pip-freeze-list)
+    - [4.2.2 setuptools](#422-setuptools)
+      - [4.2.2.1 setup.cfg](#4221-setupcfg)
+      - [4.2.2.2 setup.py](#4222-setuppy)
+  - [4.3 virtualenv version](#43-virtualenv-version)
+  - [4.4 tox tox-travis version](#44-tox-tox-travis-version)
+  - [4.5 twine version](#45-twine-version)
+- [五. 构建与分发](#五-构建与分发)
+  - [5.1 安装](#51-安装)
+  - [5.2 配置](#52-配置)
+    - [5.2.1 pyproject.toml](#521-pyprojecttoml)
+    - [5.2.2 MANIFEST.in](#522-manifestin)
+    - [5.2.3 tox.ini](#523-toxini)
+    - [5.2.4 setup.cfg](#524-setupcfg)
+    - [5.2.5 README.md](#525-readmemd)
+  - [5.3 构建](#53-构建)
+    - [5.3.1 tox 脚本测试](#531-tox-脚本测试)
+    - [5.3.2 build](#532-build)
+  - [5.3 发布](#53-发布)
+    - [5.3.1 注册账号](#531-注册账号)
+    - [5.3.2 检查软件包](#532-检查软件包)
+    - [5.3.3 上传软件包](#533-上传软件包)
+- [六. 参考](#六-参考)
 
 ## 一. 构建`venv`环境
 
+首先检查是否安装如下软件包:
+
+```bash
+# python2
+python2 -m pip --version
+python2 -m setuptools --version
+python2 -m wheel --version
+python2 -m virtualenv --version
+
+
+# python3
+python3 -m pip --version
+python3 -m setuptools --version
+python3 -m wheel --version
+python3 -m virtualenv --version
+```
+
+如果没有，请安装如下软件包:
+
+```bash
+# python2
+python2 -m pip install setuptools wheel virtualenv
+或
+python2 -m pip install virtualenv
+
+# python3
+python3 -m pip install setuptools wheel virtualenv
+或
+python3 -m pip install virtualenv
+```
+
 ### 1.1 venv2
 
 #### 1.1.1 venv2 for mac
 
+##### 1.1.1.1 venv2 16.7.5
+
 ```bash
-virtualenv -p /usr/local/bin/python2 --no-site-packages venv2
+python2 -m virtualenv -p /usr/local/bin/python2 --no-site-packages venv2
+```
+
+##### 1.1.1.2 venv2 20.4.6
+
+```bash
+python2 -m virtualenv -p /usr/local/bin/python2 venv2
 ```
 
 #### 1.1.2 venv2 for windows
@@ -36,8 +108,16 @@ python2 -m virtualenv -p C:\Python\Python27\python2.exe venv2 > venv2.log
 
 #### 1.2.1 venv3 for mac
 
+##### 1.2.1.1 venv3 16.7.5
+
+```bash
+python3 -m virtualenv -p /usr/local/bin/python3 --no-site-packages venv
+```
+
+##### 1.2.1.2 venv3 20.4.6
+
 ```bash
-virtualenv -p /usr/local/bin/python3 --no-site-packages venv
+python3 -m virtualenv -p /usr/local/bin/python3 venv
 ```
 
 #### 1.2.2 venv3 for windows
@@ -69,3 +149,460 @@ python3 -m virtualenv -p C:\Python\Python38\python3.exe venv > venv.log
 /Users/.../Python-DeMo/mock
 /Users/.../Python-DeMo/case
 ```
+
+## 三. venvX activate and deactivate
+
+### 3.1 venvX activate
+
+#### 3.1.1 activate for mac
+
+在控制台中输入如下命令，使得Mac 环境下的 `virtualenv` 生效:
+
+```bash
+# python2
+source ./venv2/bin/activate
+
+
+# python3
+source ./venv/bin/activate
+```
+
+#### 3.1.2 activate for windows
+
+在控制台中输入如下命令，使得Windows 环境下的 `virtualenv` 生效:
+
+```bash
+# python2
+./venv2/Scripts/activate
+
+
+# python3
+./venv/Scripts/activate
+```
+
+## 四. 脚本
+
+### 4.1 python version
+
+```bash
+# python
+python2 --version
+# python help
+python2 --help > ./Temp/help/python_help.txt
+```
+
+### 4.2 pip setuptools wheel version
+
+```bash
+# pip
+python2 -m pip --version
+
+# pip setuptools wheel help
+python2 -m pip --help > ./Temp/help/python_pip_help.txt
+## python2 -m setuptools --help > ./Temp/help/python_setuptools_help.txt
+python2 -m setup.py --help-commands > ./Temp/help/python_setuptools_help.txt
+python2 -m wheel --help > ./Temp/help/python_wheel_help.txt
+```
+
+#### 4.2.1 pip freeze list
+
+```bash
+# pip freeze
+python2 -m pip freeze > ./Temp/python_pip_freeze.txt
+python2 -m pip list > ./Temp/python_pip_list.txt
+```
+
+#### 4.2.2 setuptools
+
+##### 4.2.2.1 setup.cfg
+
+```bash
+# python2 build
+python2 -m pip install build
+python2 -m pip install --upgrade build
+python2 -m build
+python2 -m build > ./out/dist/build.txt
+
+# python3 build
+python3 -m pip install build
+python3 -m pip install --upgrade build
+python3 -m build
+python3 -m build > ./out/dist/build.txt
+```
+
+##### 4.2.2.2 setup.py
+
+```bash
+# setup sdist
+python2 setup.py sdist > ./out/dist/setup_sdist.txt
+python3 setup.py sdist > ./out/dist/setup_sdist.txt
+
+python2 setup.py bdist_wheel --universal
+python3 setup.py bdist_wheel --universal
+
+python2 setup.py bdist_wheel
+python3 setup.py bdist_wheel
+```
+
+### 4.3 virtualenv version
+
+```bash
+# virtualenv
+python2 -m virtualenv --version
+# virtualenv help
+python2 -m virtualenv --help > ./Temp/help/python_virtualenv_help.txt
+```
+
+### 4.4 tox tox-travis version
+
+```bash
+# tox
+python2 -m tox --version
+# python2 -m tox-travis --version
+# tox tox-travis help
+python2 -m tox --help > ./Temp/help/python_tox_help.txt
+# python2 -m tox-travis --help > ./Temp/help/python_tox_travis_help.txt
+```
+
+如若快捷生成脚本,参考如下命令:
+
+```bash
+tox-quickstart
+```
+
+默认运行命令，如下:
+
+```bash
+tox
+```
+
+### 4.5 twine version
+
+```bash
+# twine
+python2 -m twine --version
+# twine help
+python2 -m twine --help > ./Temp/help/python_twine_help.txt
+
+# check python check and upload dist format
+twine check dist/*
+twine upload dist/*
+```
+
+## 五. 构建与分发
+
+Python 软件包开发工程结构，如下所示:
+
+```Django
+# soft package tree
+
+--- project root
+    |
+    | --- .tox
+    | --- .vscode
+    | --- build
+    | --- dist
+    | --- doc
+        --- ...
+            --- README.md
+    | --- src
+        --- com
+            --- dvsnier
+                --- ...
+    | --- test
+        --- com
+            --- dvsnier
+                --- ...
+    | --- venv
+    | --- venv2
+    | --- .editorconfig
+    | --- .gitignore
+    | --- LICENSE.txt
+    | --- MANIFEST.in
+    | --- pyproject.toml
+    | --- README.md
+    | --- setup.cfg
+    | --- tox.ini
+```
+
+### 5.1 安装
+
+首先检查是否安装如下依赖:
+
+1. pip
+2. flake8 (可选)
+3. virtualenv
+4. setuptools
+5. wheel
+6. discover
+7. tox
+8. toml (可选)
+9. tox-travis (可选)
+10. build
+11. twine
+
+如若没有，请使用`pip` 命令安装如下软件包:
+
+```bash
+# python2 pip version
+python2 -m pip --version
+
+python2 -m pip install flake8
+python2 -m pip install virtualenv
+python2 -m pip install setuptools
+python2 -m pip install wheel
+python2 -m pip install discover
+python2 -m pip install tox
+python2 -m pip install toml
+python2 -m pip install tox-travis
+python2 -m pip install build
+python2 -m pip install twine
+
+# python3 pip version
+python3 -m pip --version
+
+python3 -m pip install flake8
+python3 -m pip install virtualenv
+python3 -m pip install setuptools
+python3 -m pip install wheel
+python3 -m pip install discover
+python3 -m pip install tox
+python3 -m pip install toml
+python3 -m pip install tox-travis
+python3 -m pip install build
+python3 -m pip install twine
+```
+
+其实一般安装有 `pip` 软件包的，一般都会有`setuptools` 和`wheel` 软件包附带安装;
+
+### 5.2 配置
+
+#### 5.2.1 pyproject.toml
+
+首先配置 `pyproject.toml` ，模板固定, 一般不需大范围改动;
+
+```bash
+[build-system]
+# https://setuptools.readthedocs.io/en/latest/build_meta.html
+# These are the assumed default build requirements from pip:
+# https://pip.pypa.io/en/stable/cli/pip/#pep-517-and-518-support
+#
+# As of version 10.0, pip supports projects declaring dependencies that are
+# required at install time using a pyproject.toml file, in the form described
+# in PEP 518. When building a project, pip will install the required
+# dependencies locally, and make them available to the build process.
+# Furthermore, from version 19.0 onwards, pip supports projects specifying the
+# build backend they use in pyproject.toml, in the form described in PEP 517.
+#
+requires = [
+    "setuptools>=40.8.0",
+    "wheel"
+]
+build-backend = "setuptools.build_meta"
+```
+
+#### 5.2.2 MANIFEST.in
+
+然后配置 `MANIFEST.in` 软件包应当包含哪些信息,哪些排除配置信息, 如下所示:
+
+```bash
+# https://packaging.python.org/guides/using-manifest-in/
+
+include pyproject.toml
+
+# Include the README
+include *.md
+
+# Include the license file
+include LICENSE.txt
+```
+
+同上，模板一般都是固定结构，无需太范围改动;
+
+#### 5.2.3 tox.ini
+
+再然后配置 `tox` 脚本自动化测试, 指定Python 虚拟环境版本, 配置信息如下:
+
+```bash
+# tox (https://tox.readthedocs.io/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+# For information see https://tox.readthedocs.io/en/latest/examples.html
+
+[tox]
+envlist = py27, py39
+
+minversion = 3.23.1
+
+# Activate isolated build environment. tox will use a virtual environment
+# to build a source distribution from the source tree. For build tools and
+# arguments use the pyproject.toml file as specified in PEP-517 and PEP-518.
+isolated_build = true
+
+# install testing framework
+# ... or install anything else you might need here
+[testenv]
+platform = linux: linux
+           macos: darwin
+           windows: win32
+; alwayscopy = True
+allowlist_externals =
+    /bin/bash
+changedir =
+    tests
+deps =
+    build
+    discover
+    twine
+commands =
+    discover
+    ; python -m unittest discover
+```
+
+#### 5.2.4 setup.cfg
+
+最后配置 `setup.cfg` 构建脚本, 指定软件包所要构建的软件细节部分, 举例配置信息如下:
+
+```bash
+[metadata]
+# 1. https://setuptools.readthedocs.io/en/latest/
+# 2. https://setuptools.readthedocs.io/en/latest/userguide/declarative_config.html
+# 3. https://setuptools.readthedocs.io/en/latest/references/keywords.html
+name = com.dvsnier.directory
+version = 0.0.1.dev1
+author = dvsnier
+author_email = dovsnier@qq.com
+description = this is dvsnier directory.
+long_description = file: ./doc/description/directory/README.md
+long_description_content_type = text/markdown
+keywords = dir, development
+url = https://github.com/Alinvor/Python-DeMo
+project_urls =
+    Documentation = https://packaging.python.org/tutorials/distributing-packages/
+    Funding = https://donate.pypi.org
+    Wiki = https://github.com/Alinvor/Python-DeMo/wiki
+    Bug_Tracker = https://github.com/Alinvor/Python-DeMo/issues
+    Source = https://github.com/Alinvor/Python-DeM
+platforms = any
+# classifiers
+# Development Status :: 3 - Alpha
+# Development Status :: 4 - Beta
+# Development Status :: 5 - Production/Stable
+classifiers =
+    Development Status :: 3 - Alpha
+    Programming Language :: Python :: 2.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    License :: OSI Approved :: MIT License
+    Operating System :: OS Independent
+
+python_requires =
+    >=2.7
+    <4
+
+# This includes the license file(s) in the wheel.
+# https://wheel.readthedocs.io/en/stable/user_guide.html#including-license-files-in-the-generated-wheel-file
+# https://choosealicense.com/
+license = MIT License
+license_files =
+    LICENSE.txt
+
+[options]
+package_dir =
+    = src
+
+packages = find:
+
+[options.packages.find]
+where = src
+#
+# https://packaging.python.org/guides/distributing-packages-using-setuptools/#wheels
+#
+[bdist_wheel]
+universal = 1
+```
+
+> 软件包`名称`和软件包`版本`信息, 一定要明确具体发布规则;
+
+实际项目中, 可依据如上配置信息稍加修改和增添;
+
+#### 5.2.5 README.md
+
+更新`README.md` 版本和摘要信息;
+
+### 5.3 构建
+
+#### 5.3.1 tox 脚本测试
+
+首次运行`tox` 命令，可使用`tox-quickstart` 命令, 依据简短提示信息进行配置:
+
+```bash
+tox-quickstart
+```
+
+后续运行`tox` 命令，可执行自动化脚本测试:
+
+```bash
+tox
+```
+
+#### 5.3.2 build
+
+可使用如下命令, 进行`xxx.tar.gz` 源码包和`xxx.whl` 二进制包构建, 命令如下:
+
+```bash
+# python build tar.gz and whl
+python2 -m build
+
+# python build tar.gz
+python2 -m build --sdist
+# python build whl
+python2 -m build --wheel
+
+
+# python build tar.gz and whl
+python3 -m build
+
+# python build tar.gz
+python3 -m build --sdist
+# python build whl
+python3 -m build --wheel
+```
+
+### 5.3 发布
+
+#### 5.3.1 注册账号
+
+1. 账户注册地址: https://pypi.org/account/register/
+2. 创建一个[PyPI API令牌](https://pypi.org/help/#apitoken), 以便能够安全地上传您的项目;
+3. 为了避免每次上载时都必须复制和粘贴令牌，可以创建一个`$HOME/.pypirc` 文件, 参考如下:
+
+```bash
+[pypi]
+username = __token__
+password = <the token value, including the `pypi-` prefix>
+```
+
+#### 5.3.2 检查软件包
+
+检查软件包, 命令:
+
+```bash
+twine check dist/*
+```
+
+#### 5.3.3 上传软件包
+
+上传软件包, 命令:
+
+```bash
+twine upload dist/*
+```
+
+## 六. 参考
+
+1. https://packaging.python.org/tutorials/packaging-projects/
+2. https://packaging.python.org/guides/distributing-packages-using-setuptools/
+3. https://pypi.org/pypi?%3Aaction=list_classifiers
+4. https://docs.python.org/2/distutils/setupscript.html#additional-meta-data
diff --git a/doc/description/directory/README.md b/doc/description/directory/README.md
new file mode 100644
index 0000000..7900cf0
--- /dev/null
+++ b/doc/description/directory/README.md
@@ -0,0 +1,3 @@
+# README
+
+this is dir modules.
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..8528d5a
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,17 @@
+[build-system]
+# https://setuptools.readthedocs.io/en/latest/build_meta.html
+# These are the assumed default build requirements from pip:
+# https://pip.pypa.io/en/stable/cli/pip/#pep-517-and-518-support
+#
+# As of version 10.0, pip supports projects declaring dependencies that are
+# required at install time using a pyproject.toml file, in the form described
+# in PEP 518. When building a project, pip will install the required
+# dependencies locally, and make them available to the build process.
+# Furthermore, from version 19.0 onwards, pip supports projects specifying the
+# build backend they use in pyproject.toml, in the form described in PEP 517.
+#
+requires = [
+    "setuptools>=40.8.0",
+    "wheel"
+]
+build-backend = "setuptools.build_meta"
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..f594360
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,35 @@
+# tox (https://tox.readthedocs.io/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+# For information see https://tox.readthedocs.io/en/latest/examples.html
+
+[tox]
+envlist = py27, py39
+
+minversion = 3.23.1
+
+# Activate isolated build environment. tox will use a virtual environment
+# to build a source distribution from the source tree. For build tools and
+# arguments use the pyproject.toml file as specified in PEP-517 and PEP-518.
+isolated_build = true
+
+# install testing framework
+# ... or install anything else you might need here
+[testenv]
+platform = linux: linux
+           macos: darwin
+           windows: win32
+; alwayscopy = True
+allowlist_externals =
+    /bin/bash
+changedir =
+    tests
+deps =
+    build
+    discover
+commands =
+    ; windows: python --version
+    ; macos,linux: python --version
+    discover
+    ; python -m unittest discover