Conditional shebang line for different versions of Python

Question

I have a problem when trying to run a python script on two different computers. On each computer I would like to run the script using python version 2.7.3 however the probl

Answer 1

#!/bin/sh
# -*- mode: Python -*-

""":"
# bash code here; finds a suitable python interpreter and execs this file.
# prefer unqualified "python" if suitable:
python -c 'import sys; sys.exit(not (0x020500b0 < sys.hexversion < 0x03000000))' 2>/dev/null \
    && exec python "$0" "$@"
for pyver in 2.6 2.7 2.5; do
    which python$pyver > /dev/null 2>&1 && exec python$pyver "$0" "$@"
done
echo "No appropriate python interpreter found." >&2
exit 1
":"""

import sys
print sys.version

taken from https://github.com/apache/cassandra/blob/trunk/bin/cqlsh