Installing the right way

pipsi & pipenv

Craig Loftus

pipsi

For installing scripts

Isolates each script

Provides nice porcelain

pipenv

For project dependencies

Isolates each project

Provides nice porcelain

pipsi

For installing scripts

$ sudo pip install pew
$ pip install --user pew
$ pip install pew

[gibberish]

OSError: [Errno 13] Permission denied ...
$ sudo -H pip install pew
$ curl [somewhere on github]/get-pipsi.py | python
$ 
$ pipsi install pew
$ pew --help
$ pipsi list
Packages and scripts installed through pipsi:
  Package "pipsi":
    pipsi
  Package "pew":
    pew
$ pipsi upgrade pew

pipenv

For project dependencies

$ mkvirtualenv --python=python3 fancy
(fancy) $ pip install requests "django<1.11"

or pew and venv

(fancy) $ pip freeze > requirements.txt
(fancy) $ cat requirements.txt

certifi==2017.11.5
chardet==3.0.4
Django==1.10.8
idna==2.6
requests==2.18.4
urllib3==1.22

Some time later...

(fancy) $ cat requirements.txt

certifi==2017.11.5
chardet==3.0.4
Django==1.10.8
idna==2.6
requests==2.18.4
urllib3==1.22
(fancy) $ pip install --upgrade django
$ cat requirements.txt

requests
django<1.11
(fancy) $ pip install -r requirements.txt
(fancy) $ pip freeze > requirements-frozen.txt

$ rmvirtualenv fancy_env
$ mkvirtualenv --python=python3 fancy_env
$ pip install -r requirements.txt --upgrade
$ pip freeze > requirements-frozen.txt
(fancy) $ pip install -r requirements.txt --upgrade
(fancy) $ pip freeze > requirements-frozen.txt
$ pipsi install pew
$ pipsi install pipenv
$ cd fancy_project/
$ pipenv --three
$ pipenv install requests "django<1.11"
$ cat Pipfile

[packages]

requests = "*"
django = "<1.11"


[requires]

python_version = "3.5"
$ cat Pipfile.lock

"django": {
  "hashes": [
    "sha256:ffdc7e938391ae3c2ee8ff82e0b4444e4e6bb15c99d00770285233d42aaf33d6",
    "sha256:d4ef83bd326573c00972cb9429beb396d210341a636e4b816fc9b3f505c498bb"
  ],
  "version": "==1.10.8"
},
$ pipenv install --dev pytest
[dev-packages]

pytest = "*"
$ cd fancy_project/
$ pipenv install

Uses Pipfile.lock or requirements.txt

  • pipenv update - ...
  • pipenv graph - show dependency tree
  • pipenv shell - drop into the venv
  • pipenv run - execute a script in the venv
  • pipenv check - run safety and flake8
  • reinforce best practice
  • reduce what I have to remember
  • focus ...
  • get out of the way

Comments?

$ pipenv install request
Did you mean requests? [Y/n]:

Installing things the right way with Pipsi and Pipenv

By Craig Loftus

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Installing things the right way with Pipsi and Pipenv

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