russellballestrini
2a4afea962
modified: content/2015-07-02-filtering-aws-resources-with-boto3.rst modified: content/2015-07-04-list-all-installed-package-names-in-python.rst modified: content/2015-10-16-boto3-get-main-route-table.rst modified: content/2015-11-15-migrating-from-wordpress-to-pelican.rst renamed: content/2015-11-29-bind9-on-joyent-triton-large-memory-footprint.rst -> content/2015-11-29-bind9-on-joyent-triton.rst renamed: content/2015-12-16-ubuntu-set-dns-resolver-options.rst -> content/2015-12-16-set-dns-resolver-options.rst
35 lines
1 KiB
ReStructuredText
35 lines
1 KiB
ReStructuredText
List all installed package names in Python
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##########################################
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:date: 2015-07-04 22:15
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:author: Russell Ballestrini
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:tags: Code, DevOps
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:slug: list-all-installed-package-names-in-python
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:status: published
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:summary:
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You only need a two lines of code to access package names and versions.
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Here we define a function called `pkgs`.
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This function returns a list of package resource objects.
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.. code-block:: python
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pkgs = lambda : list(__import__('pkg_resources').working_set)
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We then define two more functions: `pkg_names` & `pkg_versions`
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.. code-block:: python
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pkg_names = lambda : [x.project_name for x in pkgs()]
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pkg_versions = lambda : [x.project_name + '==' + x.version for x in pkgs()]
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Last we show how to use invoke these functions:
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.. code-block:: python
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>>> pkg_names()
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['ansible', 'pycrypto', 'PyYAML', 'Jinja2', '...truncated...', 'virt-back', 'Werkzeug', 'xmltodict']
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>>> pkg_versions()
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['ansible==1.7', 'pycrypto==2.6.1', '...truncated...', 'virt-back==0.1.0', 'xmltodict==0.9.2']
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