SQLAlchemy Oracle can't insert characters with accents - oracle

Question

I've got a project based in Flask that uses a Oracle database and communicates trough SQLAlchemyand the cx_Oracle plugin. My problem is that I have a simple table with 2 Strings:
class Example(Base):
__tablename__ = 'example'
id = Column(Integer, primary_key=True)
title = Column(String(255))
description = Column(String(1024))
And when I try to save values with accents I get this error:
UnicodeEncodeError: 'ascii' codec can't encode character '\xe9' in position 5: ordinal not in range(128)
In which de encode characters is different depending on the value of the text.
Here's an example of the values:
object = Example()
object.title = 'É its a character with accent'
object.description = 'Á another characters with accent'
db_session.add(object)
db_session.commit()
Do you have any idea what I can do to fix this? Some configuration?
Thanks :)
UPDATE:
As suggested I've tried 2 other ways:
class Example(Base):
tablename = 'example'
id = Column(Integer, primary_key=True)
title = Column(Unicode(255))
description = Column(Unicode(1024))
And
class Example(Base):
tablename = 'example'
id = Column(Integer, primary_key=True)
title = Column(String(255, convert_unicode=True))
description = Column(String(1024, convert_unicode=True))
Still got the same error.

Answer 1

that is because the names you are using, specially the accents are not in the ASCII table, please try to declare the title property as:
title = Column(String(255, convert_unicode=True)
This may help, if not declare it as Unicode instead of String.
For more information you can also check the documentation here:
http://docs.sqlalchemy.org/en/latest/core/type_basics.html
You should also ensure that on your create_engine() function you have the encoding optional param as "UTF-8" or "latin1" depending on the charset that you might need to be inputed. Of course "UTF-8" has everything you might actually need.