json模块、pickle模块（序列化）shelve模块、xml模块
json模块、pickle模块（序列化）shelve模块、xml模块
json模块：
json：与任何语言之间都可以进行信息交换（字符串的转换）
经过json转换，所有类型均可先转换为双引号形式 再转换为str
例如：文件的读写：
1 #写文件：
2 import json
3 f = open("demo.txt","w")
4 dic = {"name":"g_l"}
5 dic_str = json.dumps(dic)
6 f.write(dic_str)
7 print(type(dic_str))
8 print(dic_str)1 #读文件：
2 import json
3 f = open("demo.txt","r")
4 f_read = f.read()
5 f_read = json.loads(f_read)
6 print(type(f_read))
7 print(type(f_read))
仅仅针对文件操作的 load和dump：【dic f 参考上面两个代码】
json.dump(dic，f)
json.load(f)
packle模块：（支持函数、类等）
序列化：把变量（对象）从内存中变成可存储或者传输的过程称为序列化
1 import pickle
2 dic = {"name":"alex","name":"g_l","age":18}
3 # print(type(dic))
4 j = pickle.dumps(dic)
5 print(type(j))#字节类型
6 print(j)
7 f = open("序列化对象_pickle",'wb')
8 pickle.dump(dic,f)#f.write()#不可读文件
9 f.close()
10 # #---反序列化：
11 import pickle
12 f = open("序列化对象_pickle",'rb')
13 date = pickle.loads(f.read())#---->date = pickle.load(f)
14 print(type(date["age"]))
15 print(date["age"])View Code
shelve模块：
相对于pickle模块更简单，只有一个open函数；
返回类似于字典的对象；
可读可写；
key必须为字符串；
value是python可支持的所有类型
xml模块：
i.tag--->属性
i.attrib--->键值对（属性）
i.text--->标签下的内容
1 import xml.etree.ElementTree as ET
2 tree = ET.parse("xml_lesson")
3 root = tree.getroot()
4 print(root)
5 print(root.tag)
6 for i in root:
7 print(i)
8 print(i.tag)
9 print(i.attrib)
10 for sx in i:
11 print(i)
12 print(sx.tag)#打印属性
13 print(sx.attrib)
14 print(sx.text)
15 # #遍历节点：
16 for node in root.iter('year'):
17 print(node.tag,node.text)
18
19 #修改信息：
20 for node in root.iter('year'):
21 new_year = int(node.text)+1
22 node.text=str(new_year)
23 node.set("updata","yes")
24 tree.write('xml_xg.xml')
25
26 #删除信息：
27 for country in root.findall('country'):
28 gdp=int(country.find('gdp').text)
29 if gdp<5000:
30 root.remove(country)
31 tree.write('xml_xg.xml')
32
33 #xml数据的创建:
34 import xml.etree.ElementTree as XET
35 new_xml = ET.Element("namelist")#根节点
36 """
37 创建
38 标签
39 """
40 name = XET.SubElement(new_xml,"name",attrib={"enrolled":"yes"})
41 age = XET.SubElement(name,"age",attrib={"checked":"no"})
42 sex = XET.SubElement(name,"sex")
43 """
44
45
49 """
50 sex.text='18'
51 name2 = XET.SubElement(new_xml,"name",attrib={"enrolled":"no"})
52 age = XET.SubElement(name2,"age")
53 age.text = '8'
54
55 et = ET.ElementTree(new_xml)#生成文档对象
56 et.write("test.xml",encoding="utf-8",xml_declaration=True)
57
58 XET.dump(new_xml)#打印生成的格式应用举例:
import xml.etree.ElementTree as ET
tree = ET.parse("xml_lesson")
root = tree.getroot()
print(root)
print(root.tag)
for i in root:
print(i)
print(i.tag)
print(i.attrib)
for sx in i:
print(i)
print(sx.tag)#打印属性
print(sx.attrib)
print(sx.text)
# #遍历节点：
for node in root.iter('year'):
print(node.tag,node.text)
#修改信息：
for node in root.iter('year'):
new_year = int(node.text)+1
node.text=str(new_year)
node.set("updata","yes")
tree.write('xml_xg.xml')
#删除信息：
for country in root.findall('country'):
gdp=int(country.find('gdp').text)
if gdp<5000:
root.remove(country)
tree.write('xml_xg.xml')
#xml数据的创建:
import xml.etree.ElementTree as XET
new_xml = ET.Element("namelist")#根节点
"""
创建
标签
"""
name = XET.SubElement(new_xml,"name",attrib={"enrolled":"yes"})
age = XET.SubElement(name,"age",attrib={"checked":"no"})
sex = XET.SubElement(name,"sex")
"""
"""
sex.text='18'
name2 = XET.SubElement(new_xml,"name",attrib={"enrolled":"no"})
age = XET.SubElement(name2,"age")
age.text = '8'
et = ET.ElementTree(new_xml)#生成文档对象
et.write("test.xml",encoding="utf-8",xml_declaration=True)
XET.dump(new_xml)#打印生成的格式
应用举例
posted @ 2018-06-16 16:47 容颜-gl 阅读(...) 评论(...) 编辑 收藏