$ pipenv
Usage: pipenv [OPTIONS] COMMAND [ARGS]...

Options:
 --where  顯示項目文件所在路徑
 --venv  顯示虛擬環(huán)境實際文件所在路徑
 --py  顯示虛擬環(huán)境Python解釋器所在路徑
 --envs  顯示虛擬環(huán)境的選項變量
 --rm  刪除虛擬環(huán)境
 --bare  最小化輸出
 --completion 完整輸出
 --man  顯示幫助頁面
 --three / --two 使用Python 3/2創(chuàng)建虛擬環(huán)境（注意本機已安裝的Python版本）
 --python TEXT 指定某個Python版本作為虛擬環(huán)境的安裝源
 --site-packages 附帶安裝原Python解釋器中的第三方庫
 --jumbotron An easter egg, effectively.
 --version 版本信息
 -h, --help 幫助信息

Commands:
 check 檢查安全漏洞
 graph 顯示當前依賴關系圖信息
 install 安裝虛擬環(huán)境或者第三方庫
 lock 鎖定并生成Pipfile.lock文件
 open 在編輯器中查看一個庫
 run 在虛擬環(huán)境中運行命令
 shell 進入虛擬環(huán)境
 uninstall 卸載一個庫
 update 卸載當前所有的包，并安裝它們的最新版本

import django
print(django.get_version())

Usage: pipenv [OPTIONS] COMMAND [ARGS]...

Options:
 --update  Update Pipenv & pip to latest.
 --where  Output project home information.
 --venv  Output virtualenv information.
 --py  Output Python interpreter information.
 --envs  Output Environment Variable options.
 --rm  Remove the virtualenv.
 --bare  Minimal output.
 --completion Output completion (to be eval'd).
 --man  Display manpage.
 --three / --two Use Python 3/2 when creating virtualenv.
 --python TEXT Specify which version of Python virtualenv should use.
 --site-packages Enable site-packages for the virtualenv.
 --jumbotron An easter egg, effectively.
 --version Show the version and exit.
 -h, --help Show this message and exit.

Usage Examples:
 Create a new project using Python 3.6, specifically:
 $ pipenv --python 3.6

 Install all dependencies for a project (including dev):
 $ pipenv install --dev

 Create a lockfile containing pre-releases:
 $ pipenv lock --pre

 Show a graph of your installed dependencies:
 $ pipenv graph

 Check your installed dependencies for security vulnerabilities:
 $ pipenv check

 Install a local setup.py into your virtual environment/Pipfile:
 $ pipenv install -e .

Commands:
 check Checks for security vulnerabilities and against PEP 508 markers
  provided in Pipfile.
 graph Displays currently–installed dependency graph information.
 install Installs provided packages and adds them to Pipfile, or (if none
  is given), installs all packages.
 lock Generates Pipfile.lock.
 open View a given module in your editor.
 run Spawns a command installed into the virtualenv.
 shell Spawns a shell within the virtualenv.
 uninstall Un-installs a provided package and removes it from Pipfile.
 update Uninstalls all packages, and re-installs package(s) in [packages]
  to latest compatible versions.

$ pipenv install --python 3
$ pipenv install --python 3.6
$ pipenv install --python 2.7.14

$ cat Pipfile

[[source]]
url = "https://pypi.org/simple"
verify_ssl = true
name = "pypi"

[packages]
"urllib3" = "*"

[dev-packages]

[requires]
python_version = "3.6"

$ Pipfile.lock
{
 "_meta": {
 "hash": {
  "sha256": "af58f3510cb613d4d9241128f9a0ceb9bb936ad907543e23ad8317011dcb6715"
 },
 "pipfile-spec": 6,
 "requires": {
  "python_version": "3.6"
 },
 "sources": [
  {
  "name": "pypi",
  "url": "https://pypi.org/simple",
  "verify_ssl": true
  }
 ]
 },
 "default": {  
  "urllib3": {
  "hashes": [
  "sha256:a68ac5e15e76e7e5dd2b8f94007233e01effe3e50e8daddf69acfd81cb686baf",
  "sha256:b5725a0bd4ba422ab0e66e89e030c806576753ea3ee08554382c14e685d117b5"
  ],
  "index": "pypi",
  "version": "==1.23"
 }
 },
 "develop": {}
}

$ pipenv --venv
/Users/kennethreitz/.local/share/virtualenvs/test-Skyy4vre

$ pipenv --py
/Users/kennethreitz/.local/share/virtualenvs/test-Skyy4vre/bin/python

$ pipenv install django --dev
Installing pytest...
...
Adding pytest to Pipfile's [dev-packages]...

$ pipenv graph
requests==2.18.4
 - certifi [required: >=2017.4.17, installed: 2017.7.27.1]
 - chardet [required: >=3.0.2,<3.1.0, installed: 3.0.4]
 - idna [required: >=2.5,<2.7, installed: 2.6]
 - urllib3 [required: <1.23,>=1.21.1, installed: 1.22]

$ pipenv lock
Assuring all dependencies from Pipfile are installed...
Locking [dev-packages] dependencies...
Locking [packages] dependencies...
Note: your project now has only default [packages] installed.
To install [dev-packages], run: $ pipenv install --dev

$ pipenv uninstall urllib3 
或者
$ pipenv uninstall --all

$ pipenv update urllib3
$ pipenv update # 更新所有安裝包

$ pipenv check
Checking PEP 508 requirements…
Passed!
Checking installed package safety…
All good!

[[source]]
name = "pypi"
url = "https://pypi.tuna.tsinghua.edu.cn/simple/"
verify_ssl = true

[dev-packages]

[packages]
requests = "*"
paho-mqtt = "*"
pymongo = "*"
can = "*"
crypto = "*"
gvent = "*"
gevent = "*"

[requires]
python_version = "3.7"