python 网络编程的一些基础小知识

import threading

print(666)


def func(arg):
print(arg)


t = threading.Thread(target=func)
t.start()
print(‘end‘)

import requests
import uuid

url_list = [
‘https://www3.autoimg.cn/newsdfs/g28/M05/F9/98/120x90_0_autohomecar__ChsEnluQmUmARAhAAAFES6mpmTM281.jpg‘,
‘https://www2.autoimg.cn/newsdfs/g28/M09/FC/06/120x90_0_autohomecar__ChcCR1uQlD6AT4P3AAGRMJX7834274.jpg‘,
‘https://www2.autoimg.cn/newsdfs/g3/M00/C6/A9/120x90_0_autohomecar__ChsEkVuPsdqAQz3zAAEYvWuAspI061.jpg‘,
]


def task(url):
""""""

"""
1. DNS解析，根据域名解析出IP
2. 创建socket客户端 sk = socket.socket()
3. 向服务端发起连接请求 sk.connect()
4. 发送数据（我要图片） sk.send(...)
5. 接收数据 sk.recv(8096)

接收到数据后写入文件。
"""
ret = requests.get(url)
file_name = str(uuid.uuid4()) + ‘.jpg‘
with open(file_name, mode=‘wb‘) as f:
f.write(ret.content)


for url in url_list:
rask()

‘‘‘
- 你写好代码
- 交给解释器运行,python111.pytharm
- 解释器读取代码,再交给操作系统执行,根据你的代码去选择创建多少个线程进程去执行(单进程/单线程)
- 操作系统条用硬件:硬盘,CPU...
‘‘‘

a:
import threading
import requests
import uuid
url_list = [
‘https://www3.autoimg.cn/newsdfs/g28/M05/F9/98/120x90_0_autohomecar__ChsEnluQmUmARAhAAAFES6mpmTM281.jpg‘,
‘https://www2.autoimg.cn/newsdfs/g28/M09/FC/06/120x90_0_autohomecar__ChcCR1uQlD6AT4P3AAGRMJX7834274.jpg‘,
‘https://www2.autoimg.cn/newsdfs/g3/M00/C6/A9/120x90_0_autohomecar__ChsEkVuPsdqAQz3zAAEYvWuAspI061.jpg‘,
]

def task(url):
""""""

"""
1. DNS解析，根据域名解析出IP
2. 创建socket客户端 sk = socket.socket()
3. 向服务端发起连接请求 sk.connect()
4. 发送数据（我要图片） sk.send(...)
5. 接收数据 sk.recv(8096)

接收到数据后写入文件。
"""
ret = requests.get(url)
file_name = str(uuid.uuid4()) + ‘.jpg‘
with open(file_name, mode=‘wb‘) as f:
f.write(ret.content)


for url in url_list:
t = threading.Thread(target=task, args=(url,))
t.start()

‘‘‘
- 你写好代码
- 交给解释器运行,python111.pytharm
- 解释器读取代码,再交给操作系统执行,根据你的代码去选择创建多少个线程进程去执行(单进程/4线程)
- 操作系统条用硬件:硬盘,CPU...
‘‘‘

import threading


def func(arg):
print(arg)


t = threading.Thread(target=func, args=(11,))
t.start()
print(123)

import time


def fun(arg):
time.sleep(1)
print(arg)


t1 = threading.Thread(target=fun, args=(11,))
t1.start()

t2 = threading.Thread(target=fun, args=(11,))
t2.start()

print(123)

import time


def fun(arg):
time.sleep(1)
with open(‘a.py‘, ‘wb‘) as f:
f.write(b‘as_das‘)
print(1)


t1 = threading.Thread(target=fun, args=(11,))
t1.setDaemon(True)
t1.start()

t2 = threading.Thread(target=fun, args=(11,))
t2.setDaemon(True)
t2.start()

print(123)

import time


def fun(arg):
time.sleep(1)
with open(‘a.py‘, ‘wb‘) as f:
f.write(b‘as_das‘)
print(1)


print(‘穿件子线程1‘)
t1 = threading.Thread(target=fun, args=(11,))
t1.setDaemon(True)
t1.start()
t1.join(1)
# 无参数:让主线程在这等着,等到子线程1执行完毕才可以继续往下走
# 有参数:让主线程在这最多等待N秒,无论是否执行完毕,会继续往下走.

print(‘穿件子线程2‘)
t2 = threading.Thread(target=fun, args=(11,))
t2.setDaemon(True)
t2.start()
t2.join(1) # 让主线程在这等着,等到子线程2执行完毕才可以继续往下走

print(33)

def fun(arg):
# 获取当前执行该函数的线程的名称
n1 = threading.current_thread()
# 根据当前线程对象获取当前线程名称
n2 = n1.getName()
print(n2, arg)


t1 = threading.Thread(target=fun, args=(11,))
t1.setName(‘厚哦‘)
t1.start()

t2 = threading.Thread(target=fun, args=(22,))
t1.setName(‘薄哦‘)
t2.start()

print(33)

def func(arg):
print(arg)


t1 = threading.Thread(target=func, args=(11,))
t1.start()
# start 是开始运行线程么? 不是的
# start 告诉CUP,我已经准备就续,你可以调度我了.

print(33)

def fun(arg):
print(arg)


t1 = threading.Thread(target=fun, args=(11,))
t1.start()

class MyThread(threading.Thread):

def run(self):
print(111, self._args)


t1 = MyThread(args=(11,))
t1.start()