python中的Iterable, Iterator,生成器概念

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Spawn a Process: Chapter 3: Process Based Parallelism
import multiprocessing
import time
from collections import Iterable, Iterator
import dis
from itertools import islice


x = [1, 2, 3]
for i in x:
    print i

y = iter(x)
z = iter(x)
print dir(x)
print dir(y)
print next(y)
print next(y)
print next(z)
print next(z)
print type(x)
print isinstance(x, Iterable)
print isinstance(x, Iterator)
print type(y)
print isinstance(y, Iterable)
print isinstance(y, Iterator)

class seq(object):
    def __init__(self):
        self.gap = 2
        self.curr = 1

    def __iter__(self):
        return self

    def next(self):
        value = self.curr
        self.curr += self.gap
        return value
f = seq()
print list(islice(f, 0, 10))

def seq():
    gap, curr = 2, 1
    while True:
        yield curr
        curr += gap

f = seq()
print list(islice(f, 0, 10))

def fib():
    a, b = 0, 1
    while True:
        yield b
        a, b = b, a + b

print fib
f = fib()
print f
print(next(f), next(f), next(f), next(f), next(f))

def gen():
    while True:
        value = yield
        print(value)

g = gen()
next(g)
g.send("hahahha")
next(g)