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'''

之前有同学提到说，想知道更多关于Generator的东西。

那么这一期就给大家讲一讲Generator是什么？为什么要使用Generator？

'''

def example1():

def generator_function():

yield 1 # 中文里 有产出 或者 让步

yield 2

return 3

generatorObject = generator_function()

print(next(generatorObject))

print(next(generatorObject))

try:

print(next(generatorObject))

except:

print('We have reached the end of iteration')

def example2():

def generator_function(number):

while number > 0:

yield number

number -= 1

for number in generator_function(10):

print(number)

def example3():

def fun():

return 'fun'

def generator_function(number):

if number > 0:

yield number

print(fun())

yield from generator_function(number-1)

for number in generator_function(10):

print(number)

# example1()

# example2()

# example3()

'''

Generator

Async Operation -> I/O Bound

-> Memory Efficiency

'''

import socket

import time

def get(path):

s = socket.socket()

s.connect(('localhost', 3000))

request = 'GET %s HTTP/1.0\r\n\r\n' % path

s.send(request.encode())

chunks = []

while True:

chunk = s.recv(1000) # 1000 bytes

if chunk:

chunks.append(chunk)

else:

body = (b''.join(chunks)).decode()

print('--------------------------------------')

print(body)

print('--------------------------------------\n\n')

return

start = time.time()

get('/slow')

get('/super-slow')

get('/slower')

print('%.1f sec' % (time.time() - start))

#