%Y  表示年

%m 表示月范围 [01,12].

%d  表示天范围 [01,31].

%H  表示小时范围 [00,23].

%M 表示分钟范围 [00,59].

%S  表示秒范围 [00,61].

import random

temp = ''

for i in range(4):

    add_num = random.choice([random.randrange(0,10),chr(random.randrange(65,91))])

    temp += str(add_num)

print(temp)

import random

temp = ""

for i in range(4):

    num = random.randrange(0,4)

    if num == 3 or num == 1:

        li = random.randrange(0,10)

        temp = temp + str(li)

    else:

        rad = random.randrange(65,91)

        c = chr(rad)

        temp += c

print(temp)

import logging

logging.basicConfig(level=logging.DEBUG,

                    format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',

                    datefmt='%a, %d %b %Y %H:%M:%S',

                    filename='/tmp/test.log',

                    filemode='w')  

logging.debug('debug message')

logging.info('info message')

logging.warning('warning message')

logging.error('error message')

logging.critical('critical message')

import logging

logger = logging.getLogger()

fh = logging.FileHandler("test.log",encoding="utf-8")

ch = logging.StreamHandler()

formatter = logging.Formatter("%(asctime)s -%(name)s - %(levelname)s - %(message)s")

fh.setFormatter(formatter)

ch.setFormatter(formatter)

logger.addHandler(fh)

logger.addHandler(ch)

logger.setLevel(logging.DEBUG)

logging.debug("debug message")

logging.info("info message")

logging.warning("warning messing")

logging.error("error message")

logging.critical("critical message")

<data>

    <country name="Liechtenstein">

        <rank updated="yes">2</rank>

        <year>2023</year>

        <gdppc>141100</gdppc>

        <neighbor direction="E" name="Austria" />

        <neighbor direction="W" name="Switzerland" />

    </country>

    <country name="Singapore">

        <rank updated="yes">5</rank>

        <year>2026</year>

        <gdppc>59900</gdppc>

        <neighbor direction="N" name="Malaysia" />

    </country>

    <country name="Panama">

        <rank updated="yes">69</rank>

        <year>2026</year>

        <gdppc>13600</gdppc>

        <neighbor direction="W" name="Costa Rica" />

        <neighbor direction="E" name="Colombia" />

    </country>

</data>

from xml.etree import ElementTree as ET

############ 解析方式一 ############

# 打开文件，读取XML内容

str_xml = open('xo.xml', 'r').read()

# 将字符串解析成xml特殊对象，root代指xml文件的根节点

root = ET.XML(str_xml)

############ 操作 ############

# 顶层标签

print(root.tag)

# 循环所有的year节点

for node in root.iter('year'):

    # 将year节点中的内容自增一

    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']

############ 保存文件 ############

tree = ET.ElementTree(root)

tree.write("newnew.xml", encoding='utf-8')

from xml.etree import ElementTree as ET

############ 解析方式二 ############

# 直接解析xml文件

tree = ET.parse("xo.xml")

# 获取xml文件的根节点

root = tree.getroot()

############ 操作 ############

# 顶层标签

print(root.tag)

# 循环所有的year节点

for node in root.iter('year'):

    # 将year节点中的内容自增一

    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']

############ 保存文件 ############

tree.write("newnew.xml", encoding='utf-8')

解析文件方式，修改，保存

from xml.etree import ElementTree as ET

############ 解析字符串方式打开 ############

# 打开文件，读取XML内容

str_xml = open('xo.xml', 'r').read()

# 将字符串解析成xml特殊对象，root代指xml文件的根节点

root = ET.XML(str_xml)

############ 操作 ############

# 顶层标签

print(root.tag)

# 遍历data下的所有country节点

for country in root.findall('country'):

    # 获取每一个country节点下rank节点的内容

    rank = int(country.find('rank').text)

    if rank > 50:

        # 删除指定country节点

        root.remove(country)

############ 保存文件 ############

tree = ET.ElementTree(root)

tree.write("newnew.xml", encoding='utf-8')

from xml.etree import ElementTree as ET

############ 解析文件方式 ############

# 直接解析xml文件

tree = ET.parse("xo.xml")

# 获取xml文件的根节点

root = tree.getroot()

############ 操作 ############

# 顶层标签

print(root.tag)

# 遍历data下的所有country节点

for country in root.findall('country'):

    # 获取每一个country节点下rank节点的内容

    rank = int(country.find('rank').text)

    if rank > 50:

        # 删除指定country节点

        root.remove(country)

############ 保存文件 ############

tree.write("newnew.xml", encoding='utf-8')

from xml.etree import ElementTree as ET

# 创建根节点

root = ET.Element("famliy")

# 创建节点大儿子

son1 = ET.Element('son', {'name': '儿1'})

# 创建小儿子

son2 = ET.Element('son', {"name": '儿2'})

# 在大儿子中创建两个孙子

grandson1 = ET.Element('grandson', {'name': '儿11'})

grandson2 = ET.Element('grandson', {'name': '儿12'})

son1.append(grandson1)

son1.append(grandson2)

# 把儿子添加到根节点中

root.append(son1)

root.append(son1)

tree = ET.ElementTree(root)

tree.write('oooo.xml',encoding='utf-8', short_empty_elements=False)