_sum = plain_tuple[0] + plain_tuple[1] def access_named_tuple(): global named_tuple _sum = named_tuple.x + named_tuple.y # 执行时间测试 print(timeit.timeit(access_plain_tuple, number=1000000)) print(timeit.timeit(access_named_tuple, number=1000000)) 注意,实际的测试结果可能受多种因素...
Typeof Person: <class'type'> Representation: Person(name='Bob', age=30, gender='male') Field by Name: Jane Bobis30years old male Janeis29years old female 来解释一下nametuple的几个参数,以Person=collections.namedtuple(‘Person’,'name age gender’)为例,其中’Person’是这个namedtuple的名称,...
class Point: def __init__(self, x: float, y: float): self.x = x self.y = y pt1 = Point(1.0, 5.0) pt2 = Point(2.5, 1.5) from math import sqrt line_length = sqrt((pt1.x - pt2.x) ** 2 + (pt1.y - pt2.y) ** 2) 显然,也比用原始的tuple可读性要好: pt1 = (1...
Help on class Color in module __main__: class Color(Color) | Color(r, g, b, alpha) | | A namedtuple that represents a color. | It has 4 fields: | r - red | g - green | b - blue | alpha - the alpha channel | | Method resolution order: | Color | Color | builtins.tupl...
classPoint(tuple):'Point(x, y)'__slots__ = () _fields = ('x','y')def__new__(_cls, x, y):'Create new instance of Point(x, y)'return_tuple.__new__(_cls, (x, y))@classmethoddef_make(cls, iterable, new=tuple.__new__,len=len):'Make a new Point object from a seque...
def namedtuple(typename, field_names, *, rename=False, defaults=None, module=None): """Returns a new subclass of tuple with named fields. >>> Point = namedtuple('Point', ['x', 'y']) >>> Point.__doc__ # docstring for the new class 'Point(x, y)' >>> p = Point(11, y=22...
本经验介绍在python 3编程时，命名元组named tuple构造，读写方法以及注意事项。工具/原料 python 3 VSCode 方法/步骤 1 python 3的命名元组在collections模块内，如图。构造命名元组非常简单，使用namedtuple然后指定类型名和各个字段名。2 各个字段名除了可以写成一个字符串，空格隔开，也可以写成一个列表，如图。要...
01.Named Tuples 命名元组是易于创建的轻量级对象类型。它是 Python Collections模块中可用的工厂函数。如果你想要一个类来管理数据,你可以考虑使用命名元组作为替代。 用nametuple创建一个元组类既简单又直接,比起用重量级的class要方便很多,对于很多数据结构简单的类可以直接使用,非常轻巧。 2. For...Else 子句 平时...
inspect.isclass(object):是否为类 inspect.ismethod(object):是否为方法(bound method written in python) inspect.isfunction(object):是否为函数(python function, including lambda expression) inspect.isgeneratorfunction(object):是否为python生成器函数 inspect.isgenerator(object):是否为生成器 inspect.is...
class Cat(object): # 类,Cat指向这个类对象 def __init__(self, name='kitty'): self.name = name def sayHi(self): # 实例方法,sayHi指向这个方法对象,使用类或实例.sayHi访问 print self.name, 'says Hi!' # 访问名为name的字段,使用实例.name访问 ...