I made an error: os.symlink('/usr/bin/python','/usr/bin/python2.5')
should be
os.symlink('python2.5','/usr/bin/python')
I made an error: '/usr/bin/ python' ,'/usr/ bin/python2. 5')
os.symlink(
should be
os.symlink( 'python2. 5','/usr/ bin/python' )