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find a compatible python interpreter for a script

Project description

python_shebang Description

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This package provides a command that can be run from /usr/bin/env on the
shebang line of a script that will find an appropriate python interpreter
to run it.

Unlike plain /usr/bin/env this script allows specifying the version of python
and python modules that are required.

Supported Operating Systems
This script is designed to operate on Unix operating systems. It is of no
value on Windows which does not use shebang.

python_shebang is written to be able to run under any python version 2.6 or
higher using only modules in the python standard library.


Here is a shebang line that will run the script with a python2.6 interpreter
that has both the foo and bar modules:

```#!/usr/bin/env python_shebang version:2.6 module:foo module:bar```

This shebang line will run the script with a python 3 interpreter that has
the paramiko module:

```#!/usr/bin/env python_shebang version:3 module:paramiko```

Running the command directly will give a python shell that meets the
requirements (the asyncio module was added in python 3.4):

$ python_shebang module:asyncio
Python 3.4.0 (v3.4.0:04f714765c13, Mar 15 2014, 23:02:41)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

If a compatible interpreter cannot be found it will generate an exception (the
asyncio module was added in python 3.4)

$ python_shebang module:asyncio version:3.3
Traceback (most recent call last):
File "/usr/bin/python_shebang", line 173, in <module>
version, modules, python_interpreters=python_interpreters
File "/usr/bin/python_shebang", line 139, in __search_for_interpreters
raise PythonNotFound('No usable python interpreters found')
__main__.PythonNotFound: No usable python interpreters found

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