SQLAlchemy / Python 3（默认列值）

Question

I have an SQLAlchemy model that (simplified) looks like this:

class User(db.Model):
    created = db.Column(db.DateTime(), nullable=False, default=datetime.datetime.utcnow, onupdate=datetime.datetime.utcnow)

This worked fine with Python 2.7, but now that I've upgraded to Python 3.4.0 I get this error when trying to insert something into the database:

sqlalchemy.exc.StatementError: utcnow() takes no arguments (1 given) (original cause: TypeError: utcnow() takes no arguments (1 given))

Any ideas? Thanks in advance.

Answer 1

default and onupdate functions can take an optional context argument. See here . I'm not sure how sqlalchemy detects whether to pass this, but maybe something in 3.4 is messing with the detection. You might want to report a bug .

Answer 2

SQLAlchemy有一个已知的问题，可以在0.9.4发行说明的这一节中看到