primary_key=True)>>>fruit=Fruit.objects.create(name='Apple')>>>fruit.name='Pear'>>>fruit.save()>>>Fruit.objects.values_list('name',flat=True)<QuerySet['Apple','Pear']>
withst.sidebar:choose=option_menu("Main Menu",["About","Demo","App","Contact"],icons=['house','file-slides','app-indicator','person lines fill'],menu_icon="list",default_index=0,styles={"container":{"padding":"5!important","background-color":"#fafafa"},"icon":{"color":"orange...
③上面的example非常简单,其中的JSON数据为list形式(因为frame.json文件是由DataFrame对象转换而来的)。然而,JSON文件中的data通常不是list形式。因此,你需要将字典结构的文件转换为list形式。这个过程称为规范化(normalization)。 pandas库的json_normalize()函数能够将字符按或list转换为表格。使用前,首先要导入这个func:...
executemany(sql, valuelist) conn.commit() print("插入成功!") except Exception as e: conn.rollback() print("insert with error", e) finally: cur.close() conn.close() # 查询数据库 def select_table_by_sql(self, sql): try: conn = self.db_connection() cur = conn.cursor() cur....
collections包含了一些特殊的容器,针对Python内置的容器,例如list、dict、set和tuple,提供了另一种选择; namedtuple,可以创建包含名称的tuple; deque,类似于list的容器,可以快速的在队列头部和尾部添加、删除元素; Counter,dict的子类,计算可hash的对象; OrderedDict,dict的子类,可以记住元素的添加顺序; ...
default: 指定该列的默认值。 nullable=False: 指定该列的值不能为空。 上述仅是一部分常用的属性,有些属性只针对某些类型的数据,具体使用时需要根据需要选择。 表的增删改查 # 创建数据库表 with app.app_context(): db.create_all() # 添加新用户到数据库 user1 = User(username='alice', email='alice...
with open('files/ha.conf', mode='r', encoding='utf-8') as file_read, open('files/new_ha.conf', mode='w', encoding='utf-8') as file_write: for line in file_read: new_list = line.replace('luffycity', 'pythonav') file_write.write(new_list) # 重命名 import shutil shutil.mo...
() return file_list if not file_dir.endswith('/'): file_dir = '{}{}'.format(file_dir, '%2F') file_dir = file_dir.replace('/', '%2F') uriTmp = '{}'.format('/restconf/data/huawei-file-operation:file-operation/dirs/dir=') uri = '{}{}{}'.format(uriTmp, ',', file...
import requests # create data to test service with examples = x_list[:4] input_data = examples.to_json() headers = {'Content-Type':'application/json'} # send request to service resp = requests.post(service.scoring_uri, input_data, headers=headers) print("POST to url", service.scori...
Create list Variable Out-of-Process Set the execution mode to OutOfProcess. pyenv(ExecutionMode="OutOfProcess") ans = PythonEnvironment with properties: Version: "3.10" Executable: "C:\Python310\pythonw.exe" Library: "C:\Python310\python310.dll" Home: "C:\Python310" Status: NotLoaded Ex...