pipenv sync should uninstall packages that have been removed from lockfile

Issue description

My mental model for pipenv sync is “make the state of the virtualenv be exactly like what’s described in Pipfile.lock”. Thus, I would expect pipenv sync to uninstall any packages that are installed in the virtualenv, but not mentioned in the lockfile. Currently however, those packages simply are left as-is.

Steps to replicate

$ pipenv install requests
$ pipenv run python -c 'import requests'  # this works, of course :)
$ sed -i -e '/^requests =/d' Pipfile
$ pipenv lock
Locking [dev-packages] dependencies...
Locking [packages] dependencies...
Updated Pipfile.lock (16c839)!
$ pipenv sync
Installing dependencies from Pipfile.lock (fe5a22)...
To activate this project's virtualenv, run pipenv shell.
Alternatively, run a command inside the virtualenv with pipenv run.
All dependencies are now up-to-date!
$ pipenv run python -c 'import requests'  # expected result: ModuleNotFoundError, actual result: it still works

$ pipenv --support

Pipenv version: '2020.11.15' Pipenv location: '/Users/schnerring/install/tools/lib/python3.9/site-packages/pipenv' Python location: '/Users/schnerring/install/tools/bin/python3'

Python installations found:

• 3.9.1: /usr/local/bin/python3
• 3.9.1: /usr/local/bin/python3.9
• 3.8.7: /usr/local/bin/python3.8
• 3.7.9: /usr/local/bin/python3.7
• 2.7.16: /usr/bin/python2.7

PEP 508 Information:

{'implementation_name': 'cpython',
 'implementation_version': '3.9.1',
 'os_name': 'posix',
 'platform_machine': 'x86_64',
 'platform_python_implementation': 'CPython',
 'platform_release': '18.7.0',
 'platform_system': 'Darwin',
 'platform_version': 'Darwin Kernel Version 18.7.0: Tue Jan 12 22:04:47 PST '
                     '2021; root:xnu-4903.278.56~1/RELEASE_X86_64',
 'python_full_version': '3.9.1',
 'python_version': '3.9',
 'sys_platform': 'darwin'}

System environment variables:

• ANDROID_SDK_ROOT
• Apple_PubSub_Socket_Render
• COLORFGBG
• COLORTERM
• COMMAND_MODE
• EDITOR
• HOME
• LANG
• LC_ALL
• LC_CTYPE
• LC_TERMINAL
• LC_TERMINAL_VERSION
• LESS_TERMCAP_md
• LESS_TERMCAP_me
• LESS_TERMCAP_se
• LESS_TERMCAP_ue
• LESS_TERMCAP_us
• LOGNAME
• PATH
• PIPENV_IGNORE_VIRTUALENVS
• PWD
• PYTHONSTARTUP
• SECURITYSESSIONID
• SHELL
• SHLVL
• SSH_AUTH_SOCK
• TERM
• TERM_PROGRAM
• TERM_PROGRAM_VERSION
• TERM_SESSION_ID
• TMPDIR
• USER
• XPC_FLAGS
• XPC_SERVICE_NAME
• PIP_DISABLE_PIP_VERSION_CHECK
• PYTHONDONTWRITEBYTECODE
• PIP_SHIMS_BASE_MODULE
• PIP_PYTHON_PATH
• PYTHONFINDER_IGNORE_UNSUPPORTED

Pipenv–specific environment variables:

• PIPENV_IGNORE_VIRTUALENVS: 1

Debug–specific environment variables:

• PATH: /Users/schnerring/bin:/usr/local/bin:/Users/schnerring/.krew/bin:/usr/bin:/bin:/usr/sbin:/sbin
• SHELL: /bin/bash
• EDITOR: emacs-minimal
• LANG: en_GB.UTF-8
• PWD: /Users/schnerring

---

[Mause]

Is your pipenv reset just pipenv clean?

Uninstalls all packages not specified in Pipfile.lock.

And your pipenv update just pipenv lock?

Generates Pipfile.lock.

[wosc]

Oh. Yes. Execellent. Sorry that I didn’t look at the docs carefully enough to spot this. Thanks for letting me know!