Python：文件处理＋序列化

一、通过io读取数据，StringIO函数操作str

1.StringIO：从io模块导入，创建StringIO实例，通过StringIO实例操作str

'''

from io import StringIO

str_io = StringIO()

str_io.write('hello')

print('str_io is:',str_io.getvalue())

str_io = StringIO('hello\nworld\nwelcome!')

while True:

line = str_io.readline()

if line =='':

break

print('line is:', line)

'''

通过io读取数据，StringIO函数操作str

1.StringIO：从io模块导入，创建StringIO实例，

通过StringIO实例操作str

'''

fromioimportStringIO

str_io = StringIO()

str_io.write('hello')

print('str_io is:',str_io.getvalue())

str_io = StringIO('hello\nworld\nwelcome!')

while True:

line = str_io.readline()

ifline =='':

break

print('line is:',line)

序列化和反序列化

1.在python中，可以用pickle模块实现序列化：pickle.dump(obj,file)

2.反序列化：pickle.load(file对象) 或bytes = pickle.dumps(file)

pickle.loads(bytes)

import pickle

# 1

d =dict(name='xiaoming',num=2010)

print(pickle.dumps(d))

try:

f_name =open('C:/Users/HouYushan/Desktop/dump.txt','wb')

pickle.dump(d,f_name)

# 2

bytes = pickle.dumps(d)

result = pickle.loads(bytes)

print(result)

bytes1 = pickle.dumps(d)

result1 = pickle.loads(bytes1)

print(result1)

finally:

f_name.close()

'''序列化和反序列化

1.在python中，可以用pickle模块实现序列化：pickle.dump(obj,file)

2.反序列化：pickle.load(file对象)或bytes = pickle.dumps(file)

pickle.loads(bytes)

'''

importpickle

# 1

d =dict(name='xiaoming',num=2010)

print(pickle.dumps(d))

try:

f_name =open('C:/Users/HouYushan/Desktop/dump.txt','wb')

pickle.dump(d,f_name)

# 2

bytes = pickle.dumps(d)

result = pickle.loads(bytes)

print(result)

bytes1 = pickle.dumps(d)

result1 = pickle.loads(bytes1)

print(result1)

finally:

f_name.close()

'''

JSON序列化与反序列化

使用jsion模块对JSON数据进行编码解码。json.dumps():对数据进行编码；json.loads():对数据进行解码。

json.dump()对文件进行操作：写入JSON数据；json.load()对文件进行操作：读取JSON数据'''

import json

data = {'name':'xiaoming','num':1000}

json_data = json.dumps(data)

print('python_data:',data)

print('json_data:',json_data)

python_data = json.loads(json_data)

print('解码成的python数据：',python_data)

print('name:',python_data['name'])

print('num:',python_data['num'])

with open('C:/Users/HouYushan/Desktop/dump.txt','w')as f:

json.dump(data,f)

with open('C:/Users/HouYushan/Desktop/dump.txt','r')as f:

print(json.load(f))

'''

JSON序列化与反序列化

1.使用jsion模块对JSON数据进行编码解码。

json.dumps():对数据进行编码；

json.loads():对数据进行解码。

2.json.dump()对文件进行操作：写入JSON数据；

json.load()对文件进行操作：读取JSON数据

'''

importjson

data = {'name':'xiaoming','num':1000}

json_data = json.dumps(data)

print('python_data:',data)

print('json_data:',json_data)

python_data = json.loads(json_data)

print('解码成的python数据：',python_data)

print('name:',python_data['name'])

print('num:',python_data['num'])

withopen('C:/Users/HouYushan/Desktop/dump.txt','w')asf:

json.dump(data,f)

withopen('C:/Users/HouYushan/Desktop/dump.txt','r')asf:

print(json.load(f))