lambda statement in Python is simply an anonymous function. Due to the syntax, it is slightly more limited than regular functions, but a lot can be done through it. As always though, readability counts, so generally it is a good idea to keep it as simple as possible. One of the more common use cases is the
sort key for the
>>> class Spam(object): ... def __init__(self, value): ... self.value = value ... ... def __repr__(self): ... return '<%s: %s>' % (self.__class__.__name__, self.value) ... >>> spams = [Spam(5), Spam(2), Spam(4), Spam(1)] >>> sorted_spams = sorted(spams, key=lambda spam: spam.value) >>> spams [<Spam: 5>, <Spam: 2>, <Spam: 4>, <Spam: 1>] >>> sorted_spams [<Spam: 1>, <Spam: 2>, <Spam: 4>, <Spam: ...