json和pickle數據序列化和反序列化

序列化

info = {
    'name':'alex',
    'age':22
}

f = open("test.txt",'w')
f.write(str(info)) #把一個字典轉換成字符串 從內存存到硬盤的過程叫序列化
f.close()

import json
info = {
    'name':'alex',
    'age':22
}

f = open("test.txt",'w')
#print(json.dumps(info))
f.write(json.dumps(info)) #把一個字典轉換成字符串 從內存存到硬盤的過程叫序列化
f.close()                 #序列化dumps 函數不可以序列化 只能處理簡單的跨平臺數據交互

import pickle
def sayhi(name):
    print("hello,",name)

info = {
    'name':'alex',
    'age':22,
    'func':sayhi
}

f = open("test.txt",'wb')
#print(pickle.dumps(info))
f.write(pickle.dumps(info)) #pickle可以序列化所有的數據
f.close()

import pickle
def sayhi(name):
    print("hello,",name)

info = {
    'name':'alex',
    'age':22,
    'func':sayhi
}
f = open("test.txt","wb")
pickle.dump(info,f) # 等於f.write(pickle.dumps(info))
                    #pickle.dump(對象，文件)
f.close()

import json
info = {
    'name':'alex',
    'age':22
}
f = open("test.txt","w")
json.dump(info,f)

info["age"]=21
json.dump(info,f) #一般只dump一次，因爲3.x版本只能load一次，dump多次沒意義

f.close()

 

反序列化

f = open("test.txt",'r')
data = eval(f.read())
f.close()
print(data['age'])

import json
f = open("test.txt",'r')
data = json.loads(f.read()) #反序列化loads
print(data['age'])

import pickle
def sayhi(name):
    print("hello2,",name)

f = open("test.txt",'rb')
data = pickle.loads(f.read()) #反序列化loads pickle只能用在python裏面,java不認
print(data["func"]("alex")) #反序列化只要函數名一樣就可以，序列化的是整個的數據對象

import pickle
def sayhi(name):
    print("hello2,",name)
f=open("test.txt",'rb')
data = pickle.load(f) #等於data= pickle.loads(f.read())
print(data["func"]("alex"))

import json
f = open("test.txt",'r')
#data = json.load(f) #等於data= json.loads(f.read()) 會報錯 3.X只能load一次
for line in f:
    print(line)