python之day7

今日上课的主要内容

一，模块：

二，面向对象（上）：

作业(计算器)：

http://www.cnblogs.com/wupeiqi/articles/4949995.html

模块：

configparser:都会按照字符串进行处理
       
import configparser

config = configparser.ConfigParser()

config.read(‘xxxooo‘, encoding=‘utf-8‘)

练习：

import configparser

config = configparser.ConfigParser()
config.read(‘f1‘,encoding=‘utf-8‘)

ret = config.sections()
print(ret)

ret = config.items("section2")
print(ret)

ret = config.options(‘section2‘)
print(ret)

v = config.get(‘section1‘, ‘k1‘)
print(v)

has_sec = config.has_section(‘section1‘)
print(has_sec)

# config.add_section("section3")
# config.write(open(‘xxxooo‘, ‘w‘))
#
# config.remove_section("section3")
# config.write(open(‘xxxooo‘, ‘w‘))

has_opt = config.has_option(‘section1‘, ‘k1‘)
print(has_opt)

config.remove_option(‘section1‘, ‘k1‘)
config.write(open(‘xxxooo‘, ‘w‘))

config.set(‘section1‘, ‘k10‘, "123")
config.write(open(‘xxxooo‘, ‘w‘))

XML：
浏览器返回的字符串
    1,html
    2,json
    3,xml
        页面上做展示（字符串类型的一个XML格式数据）
        配置文件（文件，内部数据XML格式）
        
    每一个节点都是 element的对象

练习1：

from xml.etree import ElementTree as ET
tree = ET.parse(‘xo.xml‘)
root = tree.getroot()
for child in root:
    print(child.tag,child.attrib)
    for grandchild in child:
        print(grandchild.tag,grandchild.attrib)

str_xml = open(‘xo.xml‘, ‘r‘).read()
root = ET.XML(str_xml)
for node in root.iter(‘year‘):
    new_year = int(node.text) + 1
    node.text = str(new_year)

    # 设置属性
    node.set(‘name‘, ‘alex‘)
    node.set(‘age‘, ‘18‘)
    # 删除属性
    del node.attrib[‘name‘]

tree = ET.ElementTree(root)
tree.write(‘new.xml‘,encoding=‘utf-8‘)

tree = ET.parse(‘xo.xml‘)
root = tree .getroot()
for node in root.iter(‘year‘):
    new_year = int(node.text) + 1
    node.text = str(new_year)

    node.set(‘age‘,‘18‘)
    node.set(‘name‘,‘sxl‘)

    del node.attrib[‘name‘]

tree.write(‘new2.xml‘,encoding=‘utf-8‘)

练习2：

from xml.etree import ElementTree as ET
from xml.dom import minidom

def prettify(elem):
    """将节点转换成字符串，并添加缩进。
    """
    rough_string = ET.tostring(elem, ‘utf-8‘)
    reparsed = minidom.parseString(rough_string)
    return reparsed.toprettyxml(indent="\t")

root = ET.Element(‘famliy‘)
son1 = ET.Element(‘son1‘,{‘name‘:‘大儿子‘})
son2 = ET.Element(‘son2‘,{‘name‘:‘小儿子‘})
grandson1 = ET.Element(‘grandson‘, {‘name‘: ‘儿11‘})
grandson2 = ET.Element(‘grandson‘, {‘name‘: ‘儿22‘})
son1.append(grandson1)
son2.append(grandson2)
root.append(son1)
root.append(son2)

raw_str = prettify(root)
tree = ET.ElementTree(root)
tree.write(‘oooo.xml‘,encoding=‘utf-8‘, short_empty_elements=False)
f = open("xxxoo.xml",‘w‘,encoding=‘utf-8‘)
f.write(raw_str)
f.close()