I played for a while, and finally I got his job. my script (python2 located on the / bin system):
export EXTERNAL_STORAGE=/mnt/sdcard
export PYTHONPATH=/mnt/sdcard/com.googlecode.pythonforandroid/extras/python:/data/data/com.googlecode.pythonforandroid/files/python/lib/python2.6/lib-dynload:/data/data/com.googlecode.pythonforandroid/files/python/lib/python2.6
export TEMP=/mnt/sdcard/com.googlecode.pythonforandroid/extras/python/tmp
export PYTHON_EGG_CACHE=$TEMP
export PYTHONHOME=/data/data/com.googlecode.pythonforandroid/files/python
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/data/data/com.googlecode.pythonforandroid/files/python/lib:/data/data/com.googlecode.pythonforandroid/files/python/lib/python2.6/lib-dynload:/mnt/sdcard/com.googlecode.pythonforandroid/extras/python
/data/data/com.googlecode.pythonforandroid/files/python/bin/python "$@"
In Android terminal:
u0_a101@C1905:/ $ su
root@C1905:/
Now it works to enable Python2.7 in Android 5.1 Terminal!
dlopen libpython2.6.so
Python 2.6.2 (r262:71600, Mar 20 2011, 16:54:21)
[GCC 4.4.3] on linux-armv7l
Type "help", "copyright", "credits" or "license" for more information.
>>> print ";)"
;)
>>> exit()
root@C1905:/
hope this helps someone