Transcribe Greek text to Latin alphabet using the ISO 843:1997 standard (also known as ELOT 743:1987)
It's a simple function, so you can just import it to your program and use it:
from romanize import romanize
print(romanize('Ελευθέριος Βενιζέλος'))
You can also use it as a standalone module:
python romanize.py Ελευθερία ή Θάνατος
Or use it as a filter:
python romanize.py < text_in_cp1253.txt
It's also installed as a standalone script
romanize Ελευθερία ή Θάνατος
romanize < text_in_cp1253.txt