We noted that there are some limitations of generator expressions and generator functions. The limitations can be observed by executing the following command snippet:
>>> from ch02_ex4 import * >>> pfactorsl(1560) <generator object pfactorsl at 0x1007b74b0> >>> list(pfactorsl(1560)) [2, 2, 2, 3, 5, 13] >>> len(pfactorsl(1560)) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: object of type 'generator' has no len()
In the first example, we saw the generator function, pfactors1, created a generator. The generator is lazy, and doesn't have a proper value until we consume the results yielded by the generator. in itself isn't a limitation; lazy evaluation is an important ...
