今日目录：
模块
configparser
xml
shutil
zipfile
tarfile
subprocess
面向对象(上)
一. 模块
上一期博客里列出了几个常用模块(os,hashlib,sys,re), 还有几个剩余的，这篇来继续往下走。
1. configparser模块
configparser模块是Python自带模块，主要用于处理特定的文件(ini文件)，格式比较像MySQL的配置文件类型，就是文件中有多个section，每个section下面有多个配置项，如下：
[mysqld] basedir = /usr/local/mysql datadir = /data/mysql socket = /data/mysql/mysql.sock [client] host = localhost port = 3306 socket = /data/mysql/mysqld.sock
假定配置文件名字是 my.cnf
（1）获取所有节点(section)：使用sections() 方法
#!/usr/bin/env python3 # -*- coding: utf-8 -*- # Author: DBQ(Du Baoqiang) import configparser config = configparser.ConfigParser() #先把config应用一下configparser，个人感觉有点像logging模块中的logger一样 config.read(‘my.cnf‘,encoding=‘utf-8‘) #读取配置文件，编码类型为utf-8 result = config.sections() #使用sections()方法读取所有section，以列表形式返回 print(result) #结果 [‘mysqld‘, ‘client‘]
（2）获取指定section下所有键值对：items()方法
import configparser config = configparser.ConfigParser() config.read(‘my.cnf‘,encoding=‘utf-8‘) #使用items() 方法列出指定section下所有的键值对，返回一个列表的形式，key和value列表中的一个tuple result = config.items(‘mysqld‘) print(result) #结果： [(‘basedir‘, ‘/usr/local/mysql‘), (‘datadir‘, ‘/data/mysql‘), (‘socket‘, ‘/data/mysql/mysql.sock‘)]
（3）获取指定节点下所有的键, 使用options() 方法
import configparser config = configparser.ConfigParser() config.read(‘my.cnf‘,encoding=‘utf-8‘) #获取指定section下的所有的键，以列表的形式返回 result = config.options(‘mysqld‘) print(result) #结果： [‘basedir‘, ‘datadir‘, ‘socket‘]
（4）获取指定节点下键的值， 使用get() 方法
import configparser config = configparser.ConfigParser() config.read(‘my.cnf‘,encoding=‘utf-8‘) #get方法，mysqld节点下socket键 result = config.get(‘mysqld‘,‘socket‘) print(result) #执行结果： /data/mysql/mysql.sock
（5）检查、删除、添加特定section，方法has_section(), add_section(), remove_section()
import configparser config = configparser.ConfigParser() config.read(‘my.cnf‘,encoding=‘utf-8‘) #检查指定的section是否存在，返回一个布尔值，存在为True result = config.has_section(‘mysqld‘) print(result) #结果： True ####################################### #添加节点 mysqldump config.add_section(‘mysqldump‘) config.write(open(‘my.cnf‘,‘w‘)) #需要使用write方法写入内存数据到配置文件中，不然是不能持久化到文件的 result = config.sections() print(result) #执行sections查看添加后结果: [‘mysqld‘, ‘client‘, ‘mysqldump‘] ####################################### #删除节点，mysqldump config.remove_section(‘mysqldump‘) #使用remove()方法 config.write(open(‘my.cnf‘,‘w‘)) #同样默认是在内存中操作，需要调用write方法，将内存数据写入到文件来持久化存储 result = config.sections() print(result) #执行sections查看添加后结果: [‘mysqld‘, ‘client‘ ]
(6) 检查、删除设置section内的key-value
#检查section mysqld下的socket键值对是否存在 import configparser config = configparser.ConfigParser() config.read(‘my.cnf‘,encoding=‘utf-8‘) #使用has_option方法，返回一个布尔值，存在为True result = config.has_option(‘mysqld‘,‘socket‘) print(result) #执行结果： True ##################################### #在mysqld中添加 键 innodb_file_per_table 值为1 #使用set方法 config.set(‘mysqld‘,‘innodb_file_per_table‘,‘1‘) config.write(open(‘my.cnf‘,‘w‘)) #同样需要写入内存数据到文件，使用write方法 result = config.options(‘mysqld‘) print(result) #执行查看结果： [‘basedir‘, ‘datadir‘, ‘socket‘, ‘innodb_file_per_table‘] ##################################### #删除mysqld下的socket键 #使用remove_option()方法 config.remove_option(‘mysqld‘,‘innodb_file_per_table‘) config.write(open(‘my.cnf‘,‘w‘)) #写入内存数据到文件 result = config.options(‘mysqld‘) print(result) #执行查看结果： [‘basedir‘, ‘datadir‘, ‘socket‘]
使用configparser可以方便的对配置文件(ini)进行操作，其实configparser底层也是使用open函数打开文件，然后在此基础上做操作。
2. xml模块
xml在Internet上被广泛的用于数据交换，同时xml也是一种存储应用数据的常用格式。如下xml例子：
<?xml version="1.0"?>
<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/">
<channel>
<title>Planet Python</title>
<link>http://planet.python.org/</link>
<language>en</language>
<description>Planet Python - http://planet.python.org/</description>
<item>
<title>Steve Holden: Python for Data Analysis</title>
<guid>http://holdenweb.blogspot.com/...-data-analysis.html</guid>
<link>http://holdenweb.blogspot.com/...-data-analysis.html</link>
<description>...</description>
<pubDate>Mon, 19 Nov 2012 02:13:51 +0000</pubDate>
</item>
<item>
<title>Vasudev Ram: The Python Data model (for v2 and v3)</title>
<guid>http://jugad2.blogspot.com/...-data-model.html</guid>
<link>http://jugad2.blogspot.com/...-data-model.html</link>
<description>...</description>
<pubDate>Sun, 18 Nov 2012 22:06:47 +0000</pubDate>
</item>
<item>
<title>Python Diary: Been playing around with Object Databases</title>
<guid>http://www.pythondiary.com/...-object-databases.html</guid>
<link>http://www.pythondiary.com/...-object-databases.html</link>
<description>...</description>
<pubDate>Sun, 18 Nov 2012 20:40:29 +0000</pubDate>
</item>
...
</channel>
</rss>
(1) 解析xml
使用XML() 将字符串解析成xml对象
#!/usr/bin/env python3 # -*- coding: utf-8 -*- # Author: DBQ(Du Baoqiang) from xml.etree import ElementTree as ET #打开文件 result_xml = open(‘example.xml‘,‘r‘).read() #将字符串解析成xml特殊对象，root指的是xml文件的根节点 root = ET.XML(result_xml) print(root) #结果， 返回一个Element对象 <Element ‘rss‘ at 0x1018772c8>
使用xml.etree.ElementTree.parse() 函数解析整个xml文件并将其转换成一个文档对象。
tree = ET.parse(‘example.xml‘) root = tree.getroot() print(root) #执行后结果： <Element ‘rss‘ at 0x1019772c8>
(2)操作xml
xml格式类型是节点里嵌套节点 ，所以对于每一个节点都有如下的功能：
class Element:
"""An XML element.
This class is the reference implementation of the Element interface.
An element‘s length is its number of subelements. That means if you
want to check if an element is truly empty, you should check BOTH
its length AND its text attribute.
The element tag, attribute names, and attribute values can be either
bytes or strings.
*tag* is the element name. *attrib* is an optional dictionary containing
element attributes. *extra* are additional element attributes given as
keyword arguments.
Example form:
<tag attrib>text<child/>...</tag>tail
"""
当前节点的标签名
tag = None
"""The element‘s name."""
当前节点的属性
attrib = None
"""Dictionary of the element‘s attributes."""
当前节点的内容
text = None
"""
Text before first subelement. This is either a string or the value None.
Note that if there is no text, this attribute may be either
None or the empty string, depending on the parser.
"""
tail = None
"""
Text after this element‘s end tag, but before the next sibling element‘s
start tag. This is either a string or the value None. Note that if there
was no text, this attribute may be either None or an empty string,
depending on the parser.
"""
def __init__(self, tag, attrib={}, **extra):
if not isinstance(attrib, dict):
raise TypeError("attrib must be dict, not %s" % (
attrib.__class__.__name__,))
attrib = attrib.copy()
attrib.update(extra)
self.tag = tag
self.attrib = attrib
self._children = []
def __repr__(self):
return "<%s %r at %#x>" % (self.__class__.__name__, self.tag, id(self))
def makeelement(self, tag, attrib):
创建一个新节点
"""Create a new element with the same type.
*tag* is a string containing the element name.
*attrib* is a dictionary containing the element attributes.
Do not call this method, use the SubElement factory function instead.
"""
return self.__class__(tag, attrib)
def copy(self):
"""Return copy of current element.
This creates a shallow copy. Subelements will be shared with the
original tree.
"""
elem = self.makeelement(self.tag, self.attrib)
elem.text = self.text
elem.tail = self.tail
elem[:] = self
return elem
def __len__(self):
return len(self._children)
def __bool__(self):
warnings.warn(
"The behavior of this method will change in future versions. "
"Use specific ‘len(elem)‘ or ‘elem is not None‘ test instead.",
FutureWarning, stacklevel=2
)
return len(self._children) != 0 # emulate old behaviour, for now
def __getitem__(self, index):
return self._children[index]
def __setitem__(self, index, element):
# if isinstance(index, slice):
# for elt in element:
# assert iselement(elt)
# else:
# assert iselement(element)
self._children[index] = element
def __delitem__(self, index):
del self._children[index]
def append(self, subelement):
为当前节点追加一个子节点
"""Add *subelement* to the end of this element.
The new element will appear in document order after the last existing
subelement (or directly after the text, if it‘s the first subelement),
but before the end tag for this element.
"""
self._assert_is_element(subelement)
self._children.append(subelement)
def extend(self, elements):
为当前节点扩展 n 个子节点
"""Append subelements from a sequence.
*elements* is a sequence with zero or more elements.
"""
for element in elements:
self._assert_is_element(element)
self._children.extend(elements)
def insert(self, index, subelement):
在当前节点的子节点中插入某个节点，即：为当前节点创建子节点，然后插入指定位置
"""Insert *subelement* at position *index*."""
self._assert_is_element(subelement)
self._children.insert(index, subelement)
def _assert_is_element(self, e):
# Need to refer to the actual Python implementation, not the
# shadowing C implementation.
if not isinstance(e, _Element_Py):
raise TypeError(‘expected an Element, not %s‘ % type(e).__name__)
def remove(self, subelement):
在当前节点在子节点中删除某个节点
"""Remove matching subelement.
Unlike the find methods, this method compares elements based on
identity, NOT ON tag value or contents. To remove subelements by
other means, the easiest way is to use a list comprehension to
select what elements to keep, and then use slice assignment to update
the parent element.
ValueError is raised if a matching element could not be found.
"""
# assert iselement(element)
self._children.remove(subelement)
def getchildren(self):
获取所有的子节点（废弃）
"""(Deprecated) Return all subelements.
Elements are returned in document order.
"""
warnings.warn(
"This method will be removed in future versions. "
"Use ‘list(elem)‘ or iteration over elem instead.",
DeprecationWarning, stacklevel=2
)
return self._children
def find(self, path, namespaces=None):
获取第一个寻找到的子节点
"""Find first matching element by tag name or path.
*path* is a string having either an element tag or an XPath,
*namespaces* is an optional mapping from namespace prefix to full name.
Return the first matching element, or None if no element was found.
"""
return ElementPath.find(self, path, namespaces)
def findtext(self, path, default=None, namespaces=None):
获取第一个寻找到的子节点的内容
"""Find text for first matching element by tag name or path.
*path* is a string having either an element tag or an XPath,
*default* is the value to return if the element was not found,
*namespaces* is an optional mapping from namespace prefix to full name.
Return text content of first matching element, or default value if
none was found. Note that if an element is found having no text
content, the empty string is returned.
"""
return ElementPath.findtext(self, path, default, namespaces)
def findall(self, path, namespaces=None):
获取所有的子节点
"""Find all matching subelements by tag name or path.
*path* is a string having either an element tag or an XPath,
*namespaces* is an optional mapping from namespace prefix to full name.
Returns list containing all matching elements in document order.
"""
return ElementPath.findall(self, path, namespaces)
def iterfind(self, path, namespaces=None):
获取所有指定的节点，并创建一个迭代器（可以被for循环）
"""Find all matching subelements by tag name or path.
*path* is a string having either an element tag or an XPath,
*namespaces* is an optional mapping from namespace prefix to full name.
Return an iterable yielding all matching elements in document order.
"""
return ElementPath.iterfind(self, path, namespaces)
def clear(self):
清空节点
"""Reset element.
This function removes all subelements, clears all attributes, and sets
the text and tail attributes to None.
"""
self.attrib.clear()
self._children = []
self.text = self.tail = None
def get(self, key, default=None):
获取当前节点的属性值
"""Get element attribute.
Equivalent to attrib.get, but some implementations may handle this a
bit more efficiently. *key* is what attribute to look for, and
*default* is what to return if the attribute was not found.
Returns a string containing the attribute value, or the default if
attribute was not found.
"""
return self.attrib.get(key, default)
def set(self, key, value):
为当前节点设置属性值
"""Set element attribute.
Equivalent to attrib[key] = value, but some implementations may handle
this a bit more efficiently. *key* is what attribute to set, and
*value* is the attribute value to set it to.
"""
self.attrib[key] = value
def keys(self):
获取当前节点的所有属性的 key
"""Get list of attribute names.
Names are returned in an arbitrary order, just like an ordinary
Python dict. Equivalent to attrib.keys()
"""
return self.attrib.keys()
def items(self):
获取当前节点的所有属性值，每个属性都是一个键值对
"""Get element attributes as a sequence.
The attributes are returned in arbitrary order. Equivalent to
attrib.items().
Return a list of (name, value) tuples.
"""
return self.attrib.items()
def iter(self, tag=None):
在当前节点的子孙中根据节点名称寻找所有指定的节点，并返回一个迭代器（可以被for循环）。
"""Create tree iterator.
The iterator loops over the element and all subelements in document
order, returning all elements with a matching tag.
If the tree structure is modified during iteration, new or removed
elements may or may not be included. To get a stable set, use the
list() function on the iterator, and loop over the resulting list.
*tag* is what tags to look for (default is to return all elements)
Return an iterator containing all the matching elements.
"""
if tag == "*":
tag = None
if tag is None or self.tag == tag:
yield self
for e in self._children:
yield from e.iter(tag)
# compatibility
def getiterator(self, tag=None):
# Change for a DeprecationWarning in 1.4
warnings.warn(
"This method will be removed in future versions. "
"Use ‘elem.iter()‘ or ‘list(elem.iter())‘ instead.",
PendingDeprecationWarning, stacklevel=2
)
return list(self.iter(tag))
def itertext(self):
在当前节点的子孙中根据节点名称寻找所有指定的节点的内容，并返回一个迭代器（可以被for循环）。
"""Create text iterator.
The iterator loops over the element and all subelements in document
order, returning all inner text.
"""
tag = self.tag
if not isinstance(tag, str) and tag is not None:
return
if self.text:
yield self.text
for e in self:
yield from e.itertext()
if e.tail:
yield e.tail
节点功能
遍历xml文档的所有内容：
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Author: DBQ(Du Baoqiang)
from xml.etree import ElementTree as ET
# 解析xml字符串
# result_xml = open(‘example.xml‘,‘r‘).read()
# root = ET.XML(result_xml)
#直接对解析xml文档
tree = ET.parse(‘example.xml‘)
#获取根节点
root = tree.getroot()
#操作
#获取顶级标签
print(root.tag)
#遍历xml文档的第二层
for i in root:
print(i.tag,i.attrib)
#循环遍历第三层
for j in i:
print(j.tag,j.attrib)
#第四层的标签和内容
for c in j:
print(c.tag,c.text)
遍历xml文档的所有内容
遍历xml文档中指定的节点：
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Author: DBQ(Du Baoqiang)
from xml.etree import ElementTree as ET
# 解析xml字符串
# result_xml = open(‘example.xml‘,‘r‘).read()
# root = ET.XML(result_xml)
#直接对解析xml文档
tree = ET.parse(‘example.xml‘)
#获取根节点
root = tree.getroot()
#操作
#获取顶级标签
print(root.tag)
#遍历xml文档的第二层
for i in root:
print(i.tag,i.attrib)
# 遍历所有的link节点，打印标签和内容，内容用text()
for j in i.iter(‘link‘):
print(j.tag,j.text)
#执行结果如下：
rss
channel {}
link http://planet.python.org/
link http://holdenweb.blogspot.com/...-data-analysis.html
link http://jugad2.blogspot.com/...-data-model.html
link http://www.pythondiary.com/...-object-databases.html
遍历xml文档中指定节点link内容
修改节点的内容
和上面configparser一样，所做的修改是在内存中进行，并不会对xml原始文档做修改，如果需要保存修改的配置，需要将内存里的数据写入到xml文件中。
也是分两种方式，解析字符串方式的修改保存， 和直接解析文件方式的修改，保存。
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Author: DBQ(Du Baoqiang)
from xml.etree import ElementTree as ET
# 解析xml字符串
result_xml = open(‘example.xml‘,‘r‘).read()
#找到根节点
root = ET.XML(result_xml)
#顶级标签
print(‘顶级标签: %s‘%root.tag)
#循环所有的‘link‘节点
for i in root:
for j in i.iter(‘item‘):
#修改原有属性:
j.text = str(‘http://www.jd.com‘)
#添加属性:
j.set(‘linkA‘,‘https://www.dbq168.com‘)
j.set(‘linkB‘,‘http://www.sina.com.cn‘)
#删除原有属性:
del j.attrib[‘linkB‘]
print(type(j.attrib))
print(j.attrib)
#保存内存中的修改到一个新文件，example_new.xml
tree = ET.ElementTree(root)
tree.write(‘example_new.xlm‘,encoding=‘utf-8‘)
解析字符串方式修改保存
# #直接对解析xml文档
tree = ET.parse(‘example.xml‘)
#获取根节点
root = tree.getroot()
#顶级标签
print(‘顶级标签: %s‘%root.tag)
for i in root:
for j in i.iter(‘item‘):
#修改原有属性:
j.text = str(‘http://www.jd.com‘)
#添加属性:
j.set(‘linkA‘,‘https://www.dbq168.com‘)
j.set(‘linkB‘,‘http://www.sina.com.cn‘)
#删除原有属性:
del j.attrib[‘linkB‘]
print(type(j.attrib))
print(j.attrib)
#保存文件到example_new2.xml
tree.write(‘example_new2.xml‘,encoding=‘utf-8‘)
解析xml文件方式修改保存
删除节点，删除所有节点下的language
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Author: DBQ(Du Baoqiang)
from xml.etree import ElementTree as ET
# 解析xml字符串
result_xml = open(‘example.xml‘,‘r‘).read()
#找到根节点
root = ET.XML(result_xml)
#顶级标签
print(‘顶级标签: %s‘%root.tag)
#遍历
for i in root:
for j in i.findall(‘language‘):
i.remove(j)
#保存文件:
tree = ET.ElementTree(root)
tree.write(‘example_new.xml‘,encoding=‘utf-8‘)
解析字符串方式删除节点，保存配置
from xml.etree import ElementTree as ET
# #直接对解析xml文档
tree = ET.parse(‘example.xml‘)
#获取根节点
root = tree.getroot()
#顶级标签
print(‘顶级标签: %s‘%root.tag)
#遍历
for i in root:
for j in i.findall(‘language‘):
i.remove(j)
#保存文件:
tree.write(‘example_new2.xml‘,encoding=‘utf-8‘)
解析xml文件方式删除节点，保存配置
(3) 创建xml文档
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Author: DBQ(Du Baoqiang)
from xml.etree import ElementTree as ET
#创建根节点
root = ET.Element(‘company‘)
#创建节点的部门
ceo = ET.Element(‘manager‘,{‘ceo‘:‘xiaomage‘})
#创建coo
coo = ET.Element(‘manager‘,{‘coo‘:‘xiaoyang‘})
#创建cto
cto = ET.Element(‘manager‘,{‘cto‘:‘laowang‘})
#给cto创建部门
dev = ET.Element(‘tech‘,{‘dev‘:‘xiaoli‘})
ops = ET.Element(‘tech‘,{‘ops‘:‘xiaoqiang‘})
cto.append(dev)
cto.append(ops)
#将manager添加到root中
root.append(ceo)
root.append(coo)
root.append(cto)
tree = ET.ElementTree(root)
tree.write(‘company.xml‘,encoding=‘utf-8‘,short_empty_elements=False)
#默认没有缩进：
<company><manager ceo="xiaomage"></manager><manager coo="xiaoyang"></manager><manager cto="laowang"><tech dev="xiaoli"></tech><tech ops="xiaoqiang"></tech></manager></company>
方式一
from xml.etree import ElementTree as ET
#创建根节点
root = ET.Element(‘company‘)
#创建高管
ceo = root.makeelement(‘manager‘,{‘ceo‘:‘xiaomage‘})
coo = root.makeelement(‘manager‘,{‘coo‘:‘xiaoyang‘})
cto = root.makeelement(‘manager‘,{‘cto‘:‘laowang‘})
#创建技术部门
dev = cto.makeelement(‘tech‘,{‘dev‘:‘xiaoli‘})
ops = cto.makeelement(‘tech‘,{‘ops‘:‘xiaoqiang‘})
cto.append(dev)
cto.append(ops)
#添加部门到根节点
root.append(ceo)
root.append(coo)
root.append(cto)
tree = ET.ElementTree(root)
tree.write(‘company_v2.xml‘,encoding=‘utf-8‘,short_empty_elements=False)
#默认没有缩进：
<company><manager ceo="xiaomage"></manager><manager coo="xiaoyang"></manager><manager cto="laowang"><tech dev="xiaoli"></tech><tech ops="xiaoqiang"></tech></manager></company>
方式二创建
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Author: DBQ(Du Baoqiang)
from xml.etree import ElementTree as ET
#创建根节点
root = ET.Element(‘company‘)
#创建高管
ceo = ET.SubElement(root,‘manager‘,attrib={‘ceo‘:‘xiaomage‘})
coo = ET.SubElement(root,‘manager‘,attrib={‘coo‘:‘xiaoyang‘})
cto = ET.SubElement(root,‘manager‘,attrib={‘cto‘:‘laowang‘})
#创建技术部门
dev = ET.SubElement(cto,‘tech‘,{‘dev‘:‘xiaoli‘})
ops = ET.SubElement(cto,‘tech‘,{‘ops‘:‘xiaoqiang‘})
cto.append(dev)
cto.append(ops)
tree = ET.ElementTree(root) #生成文档对象
tree.write(‘company_v3.xml‘,encoding=‘utf-8‘,short_empty_elements=False)
# #创建根节点
# root = ET.Element(‘company‘)
#
# #创建高管
# ceo = root.makeelement(‘manager‘,{‘ceo‘:‘xiaomage‘})
# coo = root.makeelement(‘manager‘,{‘coo‘:‘xiaoyang‘})
# cto = root.makeelement(‘manager‘,{‘cto‘:‘laowang‘})
#
# #创建技术部门
# dev = cto.makeelement(‘tech‘,{‘dev‘:‘xiaoli‘})
# ops = cto.makeelement(‘tech‘,{‘ops‘:‘xiaoqiang‘})
#
# cto.append(dev)
# cto.append(ops)
#
# #添加部门到根节点
# root.append(ceo)
# root.append(coo)
# root.append(cto)
#
# tree = ET.ElementTree(root)
# tree.write(‘company_v2.xml‘,encoding=‘utf-8‘,short_empty_elements=False)
# #创建根节点
# root = ET.Element(‘company‘)
#
# #创建节点的部门
# ceo = ET.Element(‘manager‘,{‘ceo‘:‘xiaomage‘})
#
# #创建coo
# coo = ET.Element(‘manager‘,{‘coo‘:‘xiaoyang‘})
#
# #创建cto
# cto = ET.Element(‘manager‘,{‘cto‘:‘laowang‘})
#
# #给cto创建部门
# dev = ET.Element(‘tech‘,{‘dev‘:‘xiaoli‘})
# ops = ET.Element(‘tech‘,{‘ops‘:‘xiaoqiang‘})
#
# cto.append(dev)
# cto.append(ops)
#
# #将manager添加到root中
# root.append(ceo)
# root.append(coo)
# root.append(cto)
#
# tree = ET.ElementTree(root)
# tree.write(‘company.xml‘,encoding=‘utf-8‘,short_empty_elements=False)
#默认没有缩进:
<company><manager ceo="xiaomage"></manager><manager coo="xiaoyang"></manager><manager cto="laowang"><tech dev="xiaoli"></tech><tech ops="xiaoqiang"></tech><tech dev="xiaoli"></tech><tech ops="xiaoqiang"></tech></manager></company>
方式三创建
默认保存的xml没有缩进，特别的难看，可以按照下面方式添加缩进：
from xml.etree import ElementTree as ET
from xml.dom import minidom
def prettify(string):
‘‘‘
将节点转换成字符串,并添加缩进
:param string:
:return:
‘‘‘
rough_string = ET.tostring(string,‘utf-8‘)
reparesd = minidom.parseString(rough_string)
return reparesd.toprettyxml(indent=‘\t‘)
#创建根节点
root = ET.Element(‘company‘)
#创建节点的部门
ceo = ET.Element(‘manager‘,{‘ceo‘:‘xiaomage‘})
#创建coo
coo = ET.Element(‘manager‘,{‘coo‘:‘xiaoyang‘})
#创建cto
cto = ET.Element(‘manager‘,{‘cto‘:‘laowang‘})
#给cto创建部门
dev = ET.Element(‘tech‘,{‘dev‘:‘xiaoli‘})
ops = ET.Element(‘tech‘,{‘ops‘:‘xiaoqiang‘})
cto.append(dev)
cto.append(ops)
#将manager添加到root中
root.append(ceo)
root.append(coo)
root.append(cto)
string = prettify(root)
f = open(‘company.xml‘,‘w‘,encoding=‘utf-8‘)
f.write(string)
f.close()
#执行结果：
<?xml version="1.0" ?>
<company>
<manager ceo="xiaomage"/>
<manager coo="xiaoyang"/>
<manager cto="laowang">
<tech dev="xiaoli"/>
<tech ops="xiaoqiang"/>
</manager>
</company>
缩进
from xml.etree import ElementTree as ET
from xml.dom import minidom
def prettify(string):
‘‘‘
将节点转换成字符串,并添加缩进
:param string:
:return:
‘‘‘
rough_string = ET.tostring(string,‘utf-8‘)
reparesd = minidom.parseString(rough_string)
return reparesd.toprettyxml(indent=‘\t‘)
#创建根节点
root = ET.Element(‘company‘)
#创建高管
ceo = root.makeelement(‘manager‘,{‘ceo‘:‘xiaomage‘})
coo = root.makeelement(‘manager‘,{‘coo‘:‘xiaoyang‘})
cto = root.makeelement(‘manager‘,{‘cto‘:‘laowang‘})
#创建技术部门
dev = cto.makeelement(‘tech‘,{‘dev‘:‘xiaoli‘})
ops = cto.makeelement(‘tech‘,{‘ops‘:‘xiaoqiang‘})
cto.append(dev)
cto.append(ops)
#添加部门到根节点
root.append(ceo)
root.append(coo)
root.append(cto)
#调用函数，转下
string = prettify(root)
#而后用open函数打开，在写入转换后的
f = open(‘company_v2.xml‘,‘w‘,encoding=‘utf-8‘)
f.write(string)
f.close()
三种创建方式都一样!
(4) 命令空间
from xml.etree import ElementTree as ET
from xml.dom import minidom
def prettify(string):
‘‘‘
将节点转换成字符串,并添加缩进
:param string:
:return:
‘‘‘
rough_string = ET.tostring(string,‘utf-8‘)
reparesd = minidom.parseString(rough_string)
return reparesd.toprettyxml(indent=‘\t‘)
ET.register_namespace(‘com‘,‘http://www.dbq168.com‘)
#
root = ET.Element(‘{http://www.dbq168.com}STUFF‘)
body = ET.SubElement(root,‘{http://www.dbq168.com}MORE_STUFF‘, attrib={‘{http://www.dbq168.com}hhh‘:‘123‘})
body.text = ‘STUFF EVERYWHERE!‘
string = prettify(root)
f = open(‘test.xml‘,‘w‘,encoding=‘utf-8‘)
f.write(string)
f.close()
命名空间
未完，待续...
时间： 2024-10-17 13:55:54