Isolated development in python

Isolated Developmentin Python

1. pip installer

pip installer

$ pip install <package>

pip installer


Download package from pypi.python.org

pip installer


$ pip install <directory>

$ pip install <tar.gz>

Download package from pypi.python.org

pip installer

$ pip install <gitrepo>

pip installer


GREAT!!

pip installer


GREAT!!

$ pip install git+git://github.com/ajdiaz/mole

$ pip install git+ssh://github.com/ajdiaz/mole

$ pip install git+git://github.com/ajdiaz/mole@840d25

$ pip install git+git://github.com/ajdiaz/mole@devel-branch

$ pip install git+git://....@devel-branch#egg=Mole

pip installer

$ pip freeze

pip installer

$ pip freeze

Fabric==1.5.2

GitPython==0.3.2.RC1

Jinja2==2.6

Pygments==1.6

Sphinx==1.2b1

argparse==1.2.1

async==0.6.1

boto==2.7.0

cuisine==0.5.1

distribute==0.6.24

docutils==0.10

gitdb==0.5.4

mico==0

paramiko==1.9.0

pycrypto==2.6

smmap==0.8.2

wsgiref==0.1.2

Create requirements.txt

2. Virtualenv: a jail for python

Virtualenv: the python jail

$ virtualenv --python=/usr/bin/python2.7 mynewenvironment


OR EVEN BETTER




OR EVEN BETTER

$ mkvirtualenv --python=/usr/bin/python2.7 mynewenvironment



OR EVEN BETTER

$ mkvirtualenv --python=/usr/bin/python2.7 mynewenvironment

mkvirtualenvwrapper

Virtualenvwrapper

$ mkvirtualenv test

Virtualenvwrapper

$ mkvirtualenv test

New python executable in test/bin/python

Installing

distribute......................................................................................................................

.......................................................................done.

Installing pip...............done.

virtualenvwrapper.user_scripts creating /home/ajdiaz/env/test/bin/predeactivate

virtualenvwrapper.user_scripts creating /home/ajdiaz/env/test/bin/postdeactivate

virtualenvwrapper.user_scripts creating /home/ajdiaz/env/test/bin/preactivate

virtualenvwrapper.user_scripts creating /home/ajdiaz/env/test/bin/postactivate

virtualenvwrapper.user_scripts creating /home/ajdiaz/env/test/bin/get_env_details

(test) $

Virtualenvwrapper

$ mkvirtualenv test


Installing

distribute......................................................................................................................

.......................................................................done.







(test) $ which python

/home/ajdiaz/env/test/bin/python

Virtualenvwrapper

$ mkvirtualenv test


Installing

distribute......................................................................................................................

.......................................................................done.







(test) $ which python

/home/ajdiaz/env/test/bin/python

yep, these are hooks!

Unit testing

Unit testing: nose

class A(object):

def __init__(self):

self.value = "Some Value"

def return_true(self):

return True

def raise_exc(self, val):

raise KeyError(val)

save it in a.py

Unit testing: nose

from a import A

from nose.tools import assert_equal

from nose.tools import assert_not_equal

from nose.tools import assert_raises

from nose.tools import raises

class TestA(object):

@classmethod

def setup_class(klass):

"""This method is run once for each class before any tests are run"""

@classmethod

def teardown_class(klass):

"""This method is run once for each class _after_ all tests are run"""

def setUp(self):

"""This method is run once before _each_ test method is executed"""

def teardown(self):

"""This method is run once after _each_ test method is executed"""

.... continue ....

Unit testing: nose

def test_init(self):

a = A()

assert_equal(a.value, "Some Value")

assert_not_equal(a.value, "Incorrect Value")

def test_return_true(self):

a = A()

assert_equal(a.return_true(), True)

assert_not_equal(a.return_true(), False)

def test_raise_exc(self):

a = A()

assert_raises(KeyError, a.raise_exc, "A value")

@raises(KeyError)

def test_raise_exc_with_decorator(self):

a = A()

a.raise_exc("A message")

save it in tests/testa.py

Unit testing: nose

$ nosetests -v tests/

Unit testing: nose

$ nosetests -v tests/

testa.TestA.test_init ... ok

testa.TestA.test_raise_exc ... ok

testa.TestA.test_raise_exc_with_decorator ... ok

testa.TestA.test_return_true ... ok

---------------------------------------------------------

Ran 4 tests in 0.002s

OK

Unit testing: Bonus: code coverage

$ pip install coverage

$ nosetests --with-coverage

....

Name Stmts Miss Cover Missing

-------------------------------------

a 8 0 100%

-------------------------------------

Ran 4 tests in 0.006s OK

Packaging Python Eggs

Python eggs: basic setup.py

from setuptools import setup

setup(

name = "example",

version = "1.0",

description = "An example package",

author='Andres J. Diaz'

)

Python eggs: basic setup.py

from setuptools import setup, find_packages

setup(

name = "example",

version = "1.0",

description = "An example package",

author='Andres J. Diaz',

packages=find_packages()

)

Python eggs: complex setup.py

import re

from setuptools import setup, find_packages

from os import path

def parse_requirements(file_name):

requirements = []

for line in open(file_name, 'r').read().split('\n'):

if re.match(r'(\s*#)|(\s*$)', line):

continue

if re.match(r'\s*-e\s+', line):

requirements.append(re.sub(r'\s*-e\s+.*#egg=(.*)$', r'\1', line))

elif re.match(r'\s*-f\s+', line):

pass

else:

requirements.append(line)

return requirements

.... continue ....


def parse_dependency_links(file_name):

dependency_links = []

for line in open(file_name, 'r').read().split('\n'):

if re.match(r'\s*-[ef]\s+', line):

dependency_links.append(re.sub(r'\s*-[ef]\s+', '', line))

return dependency_links

def get_file_contents(filename):

fd = file(path.join(path.dirname(__file__), filename), "r")

content = fd.read()

fd.close()

return content

.... continue ....


setup(

name = "mico",

version = "0.1",

description = "A monkey driven cloud management",

long_description=get_file_contents("README.rst"),

author='Andres J. Diaz',

author_email='[email protected]',

url='http://ajdiaz.github.com/mico',

packages=find_packages(),

install_requires = parse_requirements('requirements.txt'),

dependency_links = parse_dependency_links('requirements.txt'),

entry_points={

'console_scripts': [

'mico = mico.scripts.cmdline:main',

]

},

classifiers=[

'Development Status :: 4 - Beta',

'Intended Audience :: Developers',

'License :: OSI Approved :: GNU General Public License (GPL)',

'Operating System :: OS Independent',

'Programming Language :: Python',

],

)

Applauses & questionsNot necessarily in that order.

Isolated development in python

Technology

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