pip and virtualenv

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amaneu

pip and virtualenv a lightning talk for the "Python for beginners" meetup Barcelona 20/03/2014

Technologie

and now, for something completely different…

pip & virtualenv
Alex Maneu !
@zouave
@PyBcn 20/03/2014

what is this about?
package management
when you need something
someone else has written

some examples
SciPy
lxml requests
django pymongo

where to ﬁnd them?
PyPI
pypi.python.org
Python Package Index

pip
Recommended tool for
installing uninstalling upgrading
packages from PyPI

pip basic commands
pip install [—-upgrade] <package>
Installs a Python package or upgrades it to the latest
available version.
!
Examples
pip install pymongo=1.2
pip install /some/dir/mypackage.tgz
pip install http://someserver/mypackage.zip
pip install git+ssh://myserver/myrepo.git@feature#egg=MyPackage
!
!
pip uninstall <package>
Deletes an already installed package

pip basic commands
pip list [—-outdated]
Lists installed packages
!
!
pip search <string>
Searches for packages whose description contains the
speciﬁed string
> pip list --outdated
amqp (Current: 1.3.3 Latest: 1.4.4)
billiard (Current: 3.3.0.8 Latest: 3.3.0.16)
celery (Current: 3.1.5 Latest: 3.1.9)
…
Examples
> pip search cassandra
cqlengine - Cassandra CQL 3 Object Mapper for Python
CassandraLauncher - Command line utilities for launching Cassandra clusters in EC2
pycassa - Python client library for Apache Cassandra
…

what happens if…?
> pip install pymongo
!
(…)
error: could not create '/Library/Python/
2.7/site-packages/bson': Permission
denied

virtualenv
Tool for creating
Python environments
i s o l a t e d

virtualenv
v1 v2 v3
django
lxml
+
site packages
numpy=1.8.0
pymongo
requests>=2.2.0
site packages
pyOpenSSL, pip, numpy=1.6.2

creating a virtual env
virtualenv [options] <dest_dir>
Create a new virtual environment at the speciﬁed
path. It will contain a copy of all system-wide
packages.
!
Useful options
—-no-site-packages
Create a new empty virtual environment.
—-python=<python path>
Use the speciﬁed Python executable.

switching to a virtual env
> source <dir>/bin/activate
(v1)>
!
!
Exiting current virtualenv
(v1)> deactivate
>

cool stuff with pip +
virtualenv
!
pip freeze > requirements.txt
Create a description ﬁle with the packages and
versions installed under the current virtualenv.
!
pip install -r requirements.txt
Install all packages according to the speciﬁcation
in requirements.txt.

summary
• Packages: code someone else has written
(SciPy, Django, lxml, pymongo)
• Find packages on PyPI: pypi.python.org
• Install them using pip
• Keep your environment clean by using
virtualenv

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pip and virtualenv

1. and now, for something completely different…

2. pip & virtualenv Alex Maneu ! @zouave @PyBcn 20/03/2014

3. what is this about? package management when you need something someone else has written

4. some examples SciPy lxml requests django pymongo

5. jars gems eggs (wheels)

6. where to ﬁnd them? PyPI pypi.python.org Python Package Index

7. pip Recommended tool for installing uninstalling upgrading packages from PyPI

8. pip basic commands pip install [—-upgrade] <package> Installs a Python package or upgrades it to the latest available version. ! Examples pip install pymongo=1.2 pip install /some/dir/mypackage.tgz pip install http://someserver/mypackage.zip pip install git+ssh://myserver/myrepo.git@feature#egg=MyPackage ! ! pip uninstall <package> Deletes an already installed package

9. pip basic commands pip list [—-outdated] Lists installed packages ! ! pip search <string> Searches for packages whose description contains the speciﬁed string > pip list --outdated amqp (Current: 1.3.3 Latest: 1.4.4) billiard (Current: 3.3.0.8 Latest: 3.3.0.16) celery (Current: 3.1.5 Latest: 3.1.9) … Examples > pip search cassandra cqlengine - Cassandra CQL 3 Object Mapper for Python CassandraLauncher - Command line utilities for launching Cassandra clusters in EC2 pycassa - Python client library for Apache Cassandra …

10. what happens if…? > pip install pymongo ! (…) error: could not create '/Library/Python/ 2.7/site-packages/bson': Permission denied

11. virtualenv Tool for creating Python environments i s o l a t e d

12. virtualenv v1 v2 v3 django lxml + site packages numpy=1.8.0 pymongo requests>=2.2.0 site packages pyOpenSSL, pip, numpy=1.6.2

13. creating a virtual env virtualenv [options] <dest_dir> Create a new virtual environment at the speciﬁed path. It will contain a copy of all system-wide packages. ! Useful options —-no-site-packages Create a new empty virtual environment. —-python=<python path> Use the speciﬁed Python executable.

14. switching to a virtual env > source <dir>/bin/activate (v1)> ! ! Exiting current virtualenv (v1)> deactivate >

15. cool stuff with pip + virtualenv ! pip freeze > requirements.txt Create a description ﬁle with the packages and versions installed under the current virtualenv. ! pip install -r requirements.txt Install all packages according to the speciﬁcation in requirements.txt.

16. summary • Packages: code someone else has written (SciPy, Django, lxml, pymongo) • Find packages on PyPI: pypi.python.org • Install them using pip • Keep your environment clean by using virtualenv

17. Thank you! questions?

pip and virtualenv

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pip and virtualenv