python和flask中返回JSON数据的方法

s=['张三','年龄','姓名'] 
t={} 
t['data']=s 
return json.dumps(t,ensure_ascii=False) 

s=['张三','年龄','姓名'] 
return json.dumps(s,ensure_ascii=False) 

s=['张三','年龄','姓名'] 
return jsonify(s) 

s=['张三','年龄','姓名'] 
t={} 
t['data']=s 
return jsonify(t) 

s=['张三','年龄','姓名'] 
t={} 
for num in range(1,5): 
  t[str(num)]=s 
return jsonify(t) 

s=['张三','年龄','姓名'] 
t={} 
for num in range(1,5): 
  t[str(num)]=s 
data={} 
data['SUCCESS']='SUCCESS' 
data['data']=t 
return jsonify(data) 

s=['张三','年龄','姓名'] 
t={} 
for num in range(1,5): 
  t[str(num)]=s 
data={} 
data['SUCCESS']='SUCCESS' 
data['data']=t 
return json.dumps(data,ensure_ascii=False) 

from sqlalchemy.orm import class_mapper 

def as_dict(obj): 
  # return {c.name: getattr(self, c.name) for c in self.__table__.columns} 
  #上面的有缺陷，表字段和属性不一致会有问题 
  return dict((col.name, getattr(obj, col.name)) \ 
        for col in class_mapper(obj.__class__).mapped_table.c) 

users=User.query.all(); 
  dict={} 
  for i in users: 
    dict[repr(i.id)]=i.as_dict() 

json.dumps(user, default=lambda o: o.__dict__, sort_keys=True, indent=4)

class Test(object): 
  def __init__(self,name,age): 
    self.name=name 
    self.age=age 

test=Test('张三',21) 
print(json.dumps(test,default=lambda o: o.__dict__,sort_keys=True, indent=4,ensure_ascii=False))