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[雪峰磁针石博客]python 3.7极速入门教程7互联网

日期：2018-11-11点击：332收藏

7互联网

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urllib

urllib是用于打开URL的Python模块。

import urllib.request # open a connection to a URL using urllib webUrl = urllib.request.urlopen('https://china-testing.github.io/address.html') #get the result code and print it print ("result code: " + str(webUrl.getcode())) # read the data from the URL and print it data = webUrl.read() print (data)

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json

json是一种受JavaScript对象文字语法启发的轻量级数据交换格式。是目前互联网最流行的数据交换格式。

json公开了标准库marshal和pickle模块的用户所熟悉的API。

>>> import json >>> json.dumps(['foo', {'bar': ('baz', None, 1.0, 2)}]) '["foo", {"bar": ["baz", null, 1.0, 2]}]' >>> print(json.dumps("\"foo\bar")) "\"foo\bar" >>> print(json.dumps('\u1234')) "\u1234" >>> print(json.dumps('\\')) "\\" >>> print(json.dumps({"c": 0, "b": 0, "a": 0}, sort_keys=True)) {"a": 0, "b": 0, "c": 0} >>> from io import StringIO >>> io = StringIO() >>> json.dump(['streaming API'], io) >>> io.getvalue() '["streaming API"]'

参考资料

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XML

XML即可扩展标记语言(eXtensible Markup Language)。它旨在存储和传输中小数据量，并广泛用于共享结构化信息。

import xml.dom.minidom doc = xml.dom.minidom.parse("test.xml"); # print out the document node and the name of the first child tag print (doc.nodeName) print (doc.firstChild.tagName) # get a list of XML tags from the document and print each one expertise = doc.getElementsByTagName("expertise") print ("{} expertise:".format(expertise.length)) for skill in expertise: print(skill.getAttribute("name")) # create a new XML tag and add it into the document newexpertise = doc.createElement("expertise") newexpertise.setAttribute("name", "BigData") doc.firstChild.appendChild(newexpertise) print (" ") expertise = doc.getElementsByTagName("expertise") print ("{} expertise:".format(expertise.length)) for skill in expertise: print (skill.getAttribute("name"))

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ElementTree是处理XML文件的简便方法。

import xml.dom.minidom import xml.etree.ElementTree as ET tree = ET.parse('items.xml') root = tree.getroot() # all items data print('Expertise Data:') for elem in root: for subelem in elem: print(subelem.text)

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