Python xml、字典、json、类四种数据类型如何实现互相转换

from xml.etree.ElementTree import parse
try:
  doc=parse('b.xml')
  for item in doc.iterfind('class'):
      classname=item.get('a_name')
      print("classname=",classname)
      for s in list(item):
        name=s.findtext('name')
        age = s.findtext('age')
        sex = s.findtext('sex')
        print("name=",name,"age=",age,"sex=",sex)
      print("-------------------")
except Exception as e:
  print(e)

from xml.dom.minidom import parseString
import os
d=[20,'name',
  {'name':'apple','num':10,'price':23},
  {'name': 'pear', 'num': 20, 'price': 18.7},
  {'name': 'banana', 'num': 10.5, 'price': 23}]
bxml=dicttoxml.dicttoxml(d,custom_root='fruit')
xml=bxml.decode('utf-8')
print(xml)
dom=parseString(xml)
pxml=dom.toprettyxml(indent='  ')
f=open('fruits.xml','w',encoding='utf-8')
f.write(pxml)
f.close()

import xmltodict
import pprint
f=open('fruits.xml')
xml=f.read()
d=xmltodict.parse(xml)
pp=pprint.PrettyPrinter(indent=4)
pp.pprint(d)#可以通过d['root']['arg']['#text']来访问节点中的文本值，d['root']['arg']['@p']来访问属性值
f.close()

import json
data={'name':'bill','company':'huawei','age':30}
jsonstr=json.dumps(data)
print(jsonstr)

import json
class Product:
  def __init__(self,d):
    self.__dict__=d
def json2Product(d):
  return Product(d)
f=open('products.json','r',encoding='utf-8')
strjson=f.read()
products=json.loads(strjson,object_hook=Product)
for p in products:
  print('name=',p.name,'price=',p.price)

def product2Dict(product):
  return {
    'name': product.name,
    'price': product.price,
    'count': product.count
    }
strJson=json.dumps(products,default=product2Dict)
print(strJson)

import json
data=[{"name": "iPhone9", "price": 9999, "count": 3000}, {"name": "tesila", "price": 800000, "count": 122}]
# 将字典转换为json
jsonstr=json.dumps(data)
class Product:
  def __init__(self,d):
    self.__dict__=d
def json2Product(d):
  return Product(d)
# 将json转换为类
ps=json.loads(jsonstr,object_hook=Product)
for p in ps:
  print('name=', p.name, 'price=', p.price)

def product2Dict(product):
  return {
    'name': product.name,
    'price': product.price,
    'count': product.count
    }
# 将类转换为json
strJson=json.dumps(ps,default=product2Dict)
print(strJson)
d=json.loads(strJson)
print(d)

import json
import dicttoxml
f=open('products.json','r',encoding='utf-8')
jsonstr=f.read()
# 将json转换为字典
d=json.loads(jsonstr)
print(d)
# 将字典转换为xml
bxml=dicttoxml.dicttoxml(d,custom_root='fruit')
print(bxml)

import xmltodict
import json
f=open('products.xml','r',encoding='utf-8')
d=f.read()
#先将xml转换为字典
data=xmltodict.parse(d)
print(data)
#再将字典转换为json
strjson=json.dumps(data)
print(strjson)