jsonpicklexmlshelve模块

Posted 2021-12-13 chqworkhome

1、json.dump/json.dumps 将数据转换成json

v = json.dump(variant) //将variant中单引号变成双引号，再将变量转字符串

eg：

import json

numbers = [2, 3, 5, 7, 11, 13]

filename = ‘numbers.json‘

with open(filename, ‘w‘) as f_obj:

json.dump(numbers, f_obj) //同 f_obj.write(json.dumps(numbers))

 

2、json.load/json.loads 读数据,读取的内容必须符合json规范

import json

filename = ‘numbers.json‘

with open(filename) as f_obj:

numbers = json.load(f_obj) //同 numbers=json.loads(f_obj.read())

 

3、pickle.dump/pickle.dumps 将数据转换成 bytes

 

4、pickle.load/pickle.loads 读数据,读取的内容必须是bytes

 

5、shelve模块

import shelve

f = shelve.open(r"testFile1")

f["name"] = "chenhaiquan"

f["name1"] = "chenhaiquan1"

f.close()

 

ff = shelve.open(r"testFile1")

print(ff["name"])

print(ff["name1"])

ff.close()

 

 

6、xml模块

import xml.etree.ElementTree as ET

 

# 解析xml文件

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

root = tree.getroot()

print(root.tag)

 

# 遍历xml文档

for child in root:

print(child.tag, child.attrib)

for i in child:

print(i.tag, i.text)

 

# 只遍历ETD节点

for node in root.iter(‘ETD‘):

print(type(node.tag) ,node.tag, node.text)

 

# 删除

for child in root:

isChildCompelete = False

while not isChildCompelete:

isChildCompelete = True

for i in child:

if i.tag != "ETA" and i.tag != "ETD":

isChildCompelete = False

child.remove(i)

tree.write("testFile1.xml")

 

# 修改

for node in root.iter("ETD"):

node.text = "去你家里吧"

node.set("update", "true")

 

tree.write("testFile1.xml")

 

# 新增

# <?xml version=‘1.0‘ encoding=‘utf-8‘?>

# <name.list>

# <name enrolled="yes">

# <age enrolled="no" />

# <sex>19</sex>

# </name>

# <name enrolled="no">

# <age />

# </name>

# </name.list>

new_xml = ET.Element("name.list")

name = ET.SubElement(new_xml, "name", attrib={"enrolled": "yes"})

age = ET.SubElement(name, "age", attrib={"enrolled": "no"})

sex = ET.SubElement(name, "sex")

sex.text = "23"

 

name2 = ET.SubElement(new_xml, "name", attrib={"enrolled": "no"})

age = ET.SubElement(name2, "age")

sex.text = "19"

 

et = ET.ElementTree(new_xml)

et.write("testFile1.xml", encoding="utf-8", xml_declaration=True)