② 查看数值类型,发现1是由int类实例的对象 ③ 查看int类的数据类型,发现int类是由type类实例的对象 由此可推断 type类 => int类 => 1 type类 => str类 => ‘a’ type类 => list类 => ‘a’ >>> class Student: ... pass ... >>> stu = Student() # stu 是 Student 类的
self.name=namedef__get__(self, instance, owner):print("get执行了")#print("self:%s" %self)#print("instance:%s" %instance)#print("owner:%s" %owner)print("name:%s"%self.name)def__set__(self, instance, value):print("set执行了")def__delete__(self, instance):print("delete执行了")...
print(hints) # 输出:{'a': <class 'int'>, 'b': <class 'int'>, 'return': <class 'int'>} 在上面的示例中,get_type_hints(add)返回的字典中,键'a'和'b'分别对应参数a和b的类型注解int,键'return'对应返回值的类型注解int。 Get Type批注的优势在于可以在运行时获取函数的类型信息,这对于进行...
get('name') 'lilei' 代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>> b=info.get('age21') #如果是不存在的key,则返回NoneType >>> type(b) <type 'NoneType'> 代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>> info.get('age2','22')#如果是不存在的key,可以指定返回一个默认...
type_name = 'str' type_obj = getattr(__builtins__, type_name) print(type_obj('Hello, world!')) # 输出 "Hello, world!" 1. 2. 3. 4. 5. 6. 获取标准库中的属性和方法 import datetime now = datetime.datetime.now() attr_name = 'year' ...
'XRangeType', '__all__', '__builtins__', '__doc__', '__file__', '__name__', '__package__'] 2.types常见用法: # 100是整型吗? >>>isinstance(100, types.IntType) True >>>type(100) int # 看下types的源码就会发现types.IntType就是int ...
shapeType.lower() != "polygon": raise ShapeError # Get the new field name and validate it fieldname = arcpy.GetParameterAsText(1) fieldname = arcpy.ValidateFieldName(fieldname, os.path.dirname(input)) # Make sure shape_length and shape_area fields exist if len(arcpy.ListFields(input, "...
>>> return False >>> return h >>> >>> df = iris.distinct('name') >>> df = df[df.name, >>> df.name.map(myfunc, resources=[file_resource, iris_names_collection], rtype='boolean').rename('isin')] >>> >>> df name isin 0 Iris-setosa True 1 Iris-versicolor True 2 Iris-...
(ops): key, value = ops.environment.get("_cli_input") # 获取系统环境变量_cli_input,表示用户输入的命令 print ("\r\n cli input:%s"%(key)) # 判断用户输入命令行routetrack时,执行以下步骤 if key == "routetrack": handle, err_desp = ops.cli.open() # 打开命令行通道 print("\r\n ...
通过asyncio.get_event_loop()获取事件循环,常用函数: create_task:创建任务 run_until_complete:运行任务,返回结果 代码 import asyncio import time async def async_test(delay:int,content): await asyncio.sleep(delay) print(content) return content if __name__ == '__main__': print(f"start at {...