<div dir="ltr">Hi Tomislav! The behavior that you described was a bug. I fixed it and pushed the fix to the GitHub.<div> We didn't encounter this bug earlier because until this moment we always defined lambdas right inside the parentheses, like in the following example: </div><div> age = 20 query = Person.select(lambda p: p.age == age)</div><div> or </div><div> query = select(p for p in Persons) query = query.filter(lambda p: p.age == age) But in your example you define lambda in one namespace and then use it in another: def make_lambda(age): return lambda p: p.age == age fn = make_lambda(20) query = select(p for p in Persons) query = query.filter(fn) When lambda is used in such way, it takes value of 'age' outer variable not from locals or globals, but from closures. Pony ORM 0.5.1 dindn't know how to take variable values from closures. but this is fixed now, and you can take the latest version from GitHub: <a href="https://github.com/ponyorm/pony">https://github.com/ponyorm/pony</a> <div>We plan to release the new version Pony ORM 0.5.2 on Monday which includes this fix, and you will be able to install it from PyPI using pip install pony --upgrade </div><div> Thanks for the reporting! Regards, Alexander </div></div></div><div class="gmail_extra"> <div class="gmail_quote">On Sun, Aug 3, 2014 at 3:36 AM, Tomislav Tustonic <<a href="mailto:ttustonic@outlook.com" target="_blank">ttustonic@outlook.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div><div dir="ltr">Hello I have found a workaround for the problem, like this: def findByAge(age): fnc = "lambda p: p.age == {0}".format(age) fn = eval(fnc) doFindPersons(fn) But, I'd still like to know if it's possible to use lambdas directly, instead of using eval. Thanks, Tom <div><hr>From: <a href="mailto:ttustonic@outlook.com" target="_blank">ttustonic@outlook.com</a> To: <a href="mailto:ponyorm-list@ponyorm.org" target="_blank">ponyorm-list@ponyorm.org</a> Date: Sun, 3 Aug 2014 00:54:35 +0200 Subject: [PonyORM-list] Using lambda in Query filter<div><div class="h5"> <div dir="ltr">Hello I'm having a problem using passing lambda expressions as a parameter in Query filter method.In the following example call to 'findByAge0' works fine, but calling 'findByAge' raises an exception: pony.orm.core.ExprEvalError: age raises NameError: name 'age' is not defined db = Database('sqlite', ':memory:') class Person(db.Entity): name = Required(unicode) age = Required(int) db.generate_mapping(create_tables=True) with db_session: p1 = Person(name="Bing Bang", age=31) p2 = Person(name="Kick Mick", age=75) def findByAge0(age): fn = lambda p: p.age == age q = select(p for p in Person) q = q.filter(fn) with db_session: persons = list(q) for p in persons: print <a href="http://p.name" target="_blank">p.name</a> def findByAge(age): fn = lambda p: p.age == age doFindPersons(fn) def doFindPersons(fn): q = select(p for p in Person) q = q.filter(fn) with db_session: persons = list(q) for p in persons: print <a href="http://p.name" target="_blank">p.name</a> findByAge0(75) findByAge(75) a = raw_input('[Enter]') Am I doing something wrong or it's not possible to use lambda expression as in this example? Thanks in advance,Tom </div> </div></div>_______________________________________________ ponyorm-list mailing list <a href="mailto:ponyorm-list@ponyorm.org" target="_blank">ponyorm-list@ponyorm.org</a> <a href="/ponyorm-list" target="_blank">/ponyorm-list</a></div> </div></div> _______________________________________________ ponyorm-list mailing list <a href="mailto:ponyorm-list@ponyorm.org">ponyorm-list@ponyorm.org</a> <a href="/ponyorm-list" target="_blank">/ponyorm-list</a> </blockquote></div> </div>