GeezerVison is showing github.com — python_test/test45.py at master · hnfurui/python_test

Expand file tree

test45.py

Copy path

More file actions

Latest commit

History

60 lines (39 loc) · 1.44 KB

test45.py

Copy path

File metadata and controls

60 lines (39 loc) · 1.44 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

#!/usr/bin/env python3

# -*- conding: utf-8 -*-

'练习内建模块之contextlib'

__author__ = 'sergiojune'

import contextlib # 这个模块是用来设置上下文管理器的，里面有两个很好用的装饰器

import requests

class Query():

def __init__(self, name):

self.name = name

def query(self):

print('query data is %s' % self.name)

@contextlib.contextmanager

# 这个方法不是类的

def create_query(name):

q = Query(name)

yield q # 生成器，用with就是返回这个东西

print('end') # 当语句块执行完时就执行这个语句

with create_query('bob') as q:

q.query()

print('query end')

# 可以用上面的装饰器实现在运行代码之前自动运行某些代码

class Html(object):

def __init__(self, name):

self.name = name

def put_start(self):

print('<%s>' % self.name, end='')

def put_end(self):

print('</%s>' % self.name)

@contextlib.contextmanager

def create(name):

h = Html(name)

h.put_start()

yield h

h.put_end()

with create('h1') as h:

print('我是标题', end='')

# 如果一个对象没有实现上下文方法，我们还可以用colsing这个方法

with contextlib.closing(requests.get('https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/001478651770626de401ff1c0d94f379774cabd842222ff000')) as f:

print(f.text)