On Mon, Apr 20, 2020 at 6:51 PM Veek M <v...@dont-use-this.com> wrote: > > The docs state that a expression is some combination of value, operator, > variable and function. Also you cannot add or combine a generator > expression with a value as you would do with 2 + 3 + 4. For example, > someone on IRC suggested this > all(a == 'a' for a in 'apple') but > > 1. all is a function/method > 2. so (whatever) in this case is a call but obviously it works so it must > be a generator object as well.. so.. how does 'all' the function object > work with the generator object that's being produced? > > I can't for example do min 1,2,3 but i can do min (1,2,3) and the () are > not integral to a tuple - therefore one could argue that the () are part > of the call - not so with a generator Expression where the () are > integral to its existence as an object. > > Could someone clarify further.
Short answer: An expression is anything that you can evaluate - that is, anything where you can figure out its value. "1 + 1" is an expression that has the value 2, but a 'for' loop doesn't have a value, so it's not an expression. In the case of a genexp, the expression has a value which is a generator object. When you pass that to all(), it takes it and then iterates over it, because that's one of the things you can do with a generator object. :) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
