Using generator expressions and comprehensions
We can think of simple generator expressions as an operator with three operands. The syntax for these three operands parallels the
(expression for target in source)
We specify an expression which is evaluated for each value assigned to a target variable from a source. There are more complex generators, which we'll look at later.
Generator expressions can be used freely in Python. They can be used anywhere in a sequence or a collection that is meaningful.
It's important to note that a generator expression is lazy, or "non-strict." It doesn't actually calculate anything until some consuming operation demands values from it. To see this, we can try to evaluate a generator expression at the ...