List generator in Python, iterator understanding, python Generator

Source: Internet
Author: User

List generator in Python, iterator understanding, python Generator

First, let's think about a problem. For example, if we want to generate a list between 0 and, what should we do?

Of course, it can be written

List1 = [1, 2, 3..., 100]

It can be seen that this method is not suitable for the growth of the list, so you can use the existing list in Python to generate a new list, called the list generative formula, which is very concise below

List2 = [x for x in range (1,101)]

List1 and list2 are the same, but list2 is simpler.

Further than list generation, it is the list generator.

G = (x * 2 for x in range (1,101 ))

G is a generator. It is calculated based on a certain algorithm as needed, instead of being stored in the memory, saving space. It can be used like a normal list.


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