Python支持一种名为“namedtuple()”的容器字典,它存在于模块“collections”中。像字典一样,它们包含散列为特定值的键。但恰恰相反,它支持从键值和迭代访问,这是字典所缺乏的功能。示例:from collections import namedtuple # Declaring namedtuple()Student = namedtuple('Student', ['name', 'age', 'DOB'])...
def access_plain_tuple(): global plain_tuple _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, numbe...
__getnewargs__():此函数将命名元组作为普通元组返回。 # Python code to demonstrate namedtuple() and# _fields and _replace()importcollections# Declaring namedtuple()Student=collections.namedtuple('Student',['name','age','DOB'])# Adding valuesS=Student('Nandini','19','2541997')# using _fields...
| builtins.tuple | builtins.object | | Datadescriptorsdefined here: | | __dict__ | dictionary for instance variables (if defined) 复制代码 如上,通过继承_Color元组,我们为namedtupe添加了一个__doc__属性。 添加的第二种方法,直接设置__doc__属性。这种方法不需要扩展元组。 >>> Color.__doc__...
源码解释:def namedtuple(typename, field_names, *, rename=False, defaults=None, module=None): """Returns a new subclass of tuple with named fields. >>> Poin...
# .__getnewargs__ returns the named tuple as a plain tuple print(H.__getnewargs__()) 输出 All the fields of students are : ('name', 'age', 'DOB') returns a new namedtuple : Student(name='Manjeet', age='19', DOB='2541997') ...
defnamedtuple(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 ...
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...
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...
这样,进一步扩充了Python原生数据结构tuple的功能。何乐而不为呢?在需要大量索引tuple内容(尽量避免使用序号进行索引以增加程序可读性)或者是需要临时修改tuple中某一个值(再创建一个tuple会增加内存使用量)的时候,建议使用namedetuple来创建这种数据结构。 建议大家项目中多使用这种结构 好了,今天的内容就到这里了,这...