npm install [package-name] –save-dev: When –save-dev is used with npm install, it signifies that the package is a development dependency. A development dependency is any package that absence will not affect the work of the application.
npm is the command-line interface to the npm ecosystem. It is battle-tested, surprisingly flexible, and used by hundreds of thousands of JavaScript developers every day. On the other hand, pip is detailed as "A package installer for Python". It is the package installer for Python.
The pip install command installs by default the newest stable version of a python package (stable versions as specified by PEP426) The flag --pre for the pip install command tells pip also consider release candidates and develompent versions of python packages.
The npm install installs all modules that are listed on package. json file and their dependencies. npm update updates all packages in the node_modules directory and their dependencies.
There isn't an equivalent with pip
.
Best way is to pip install package && pip freeze > requirements.txt
You can see all the available options on their documentation page.
If it really bothers you, it wouldn't be too difficult to write a custom bash script (pips
) that takes a -s
argument and freezes to your requirements.txt
file automatically.
Edit 1
Since writing this there has been no change in providing an auto --save-dev
option similar to NPM however Kenneth Reitz (author of requests
and many more) has released some more info about a better pip workflow to better handle pip
updates.
Edit 2
Linked from the "better pip workflow" article above it is now recommended to use pipenv
to manage requirements and virtual environments. Having used this a lot recently I would like to summarise how simple the transition is:
Install pipenv
(on Mac)
brew install pipenv
pipenv
creates and manages it's own virtual environments so in a project with an existing requirements.txt
, installing all requirements (I use Python3.7 but you can remove the --three
if you do not) is as simple as:
pipenv --three install
Activating the virtualenv to run commands is also easy
pipenv shell
Installing requirements will automatically update the Pipfile
and Pipfile.lock
pipenv install <package>
It's also possible to update out-of-date packages
pipenv update
I highly recommend checking it out especially if coming from a npm
background as it has a similar feel to package.json
and package-lock.json
This simple line is a starting point. You can easily built a bash command to reuse the PACKAGE in the line.
pip install PACKAGE && pip freeze | grep PACKAGE >> requirements.txt
Thanks to @devsnd for the simple bash function example:
function pip-install-save {
pip install $1 && pip freeze | grep $1 >> requirements.txt
}
To use it, just run:
pip-install-save some-package
I've created python package that wraps around the actual pip
called pipm. All pip
commands will work as it is, plus they will be reflected in the requirements file. Unlike pip-save
(https://github.com/kgritesh/pip-save unactive for 5 years) similar tool I found and wasn't able to use, it can handle many files and environments(test, dev, production, etc. ). It also has command to upgrade all/any of your dependencies.
pipm install pkg-name
pipm install pkg-name --dev
pipm install pkg-name --test
pipm uninstall pkg-name
pipm update
pipm install
pipm install --dev
Update: apparently, pipenv is not officially endorsed by Python maintainers, and the previously-linked page is owned by a different organization. The tool has its pros and cons, but the below solution still achieves the result that the OP is seeking.
pipenv is a dependency management tool that wraps pip
and, among other things, provides what you're asking:
https://pipenv.kennethreitz.org/en/latest/#example-pipenv-workflow
$ pipenv install <package>
This will create a Pipfile if one doesn’t exist. If one does exist, it will automatically be edited with the new package your provided.
A Pipfile
is a direct equivalent of package.json
, while Pipfile.lock
corresponds to package-lock.json
.
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