trying python 2.7.4

-----> Python app detected
-----> No runtime.txt provided; assuming python-2.7.4.
-----> Using Python runtime (python-2.7.4)
-----> Installing dependencies using Pip (1.3.1)
       Downloading/unpacking python==2.7 (from -r requirements.txt
(line 8))
         Could not find a version that satisfies the requirement
python==2.7 (from -r requirements.txt (line 8)) (from versions: 2.3,
2.4, 2.4, 2.4.1, 2.4.1, 2.5, 2.5, 3.3.3, 2.7.6)
       No distributions matching the version for python==2.7 (from -r
requirements.txt (line 8))
       Storing complete log in /app/.pip/pip.log

 !     Push rejected, failed to compile Python app