Python：打印所有的namedtuples

Question

我有以下代码：

from collections import namedtuple

Test = namedtuple('Test', ['number_A', 'number_B'])

test_1 = Test(number_A=1, number_B=2)
test_2 = Test(number_A=3, number_B=4)
test_3 = Test(number_A=5, number_B=6)

我的问题是如何打印所有的命名元组，例如：

print (Test.number_A)

我希望您能得到以下结果：

我想要看到类似这样的结果：

1
3
5

有什么想法吗？谢谢。

- user2719106

---

不要使用带编号的变量。使用列表来存储所有的命名元组。只需循环遍历该列表即可打印出所有包含的命名元组。 - Martijn Pieters

Answer 1

在评论中，Martijn Peters建议：

不要使用编号变量。使用一个 列表 来存储所有的命名元组。只需循环遍历该列表即可打印出所有包含的命名元组。

以下是代码示例：

Test = namedtuple('Test', ['number_A', 'number_B'])
tests = []
tests.append(Test(number_A=1, number_B=2))
tests.append(Test(number_A=3, number_B=4))
tests.append(Test(number_A=5, number_B=6))

for test in tests:
    print test.number_A

提供：

1
3
5

- Steven Rumbalski

Answer 2

你可以创建一个子类来跟踪它的实例:

from collections import namedtuple

_Test = namedtuple('_Test', ['number_A', 'number_B'])

class Test(_Test):
    _instances = []
    def __init__(self, *args, **kwargs):
        self._instances.append(self)
    def __del__(self):
        self._instances.remove(self)
    @classmethod
    def all_instances(cls, attribute):
        for inst in cls._instances:
            yield getattr(inst, attribute)

test_1 = Test(number_A=1, number_B=2)
test_2 = Test(number_A=3, number_B=4)
test_3 = Test(number_A=5, number_B=6)

for value in Test.all_instances('number_A'):
    print value

输出：

1
3
5

- martineau

Answer 3

这里是一个例子：

import collections

#Create a namedtuple class with names "a" "b" "c"
Row = collections.namedtuple("Row", ["a", "b", "c"], verbose=False, rename=False)   

row = Row(a=1,b=2,c=3) #Make a namedtuple from the Row class we created

print (row)    #Prints: Row(a=1, b=2, c=3)
print (row.a)  #Prints: 1
print (row[0]) #Prints: 1

row = Row._make([2, 3, 4]) #Make a namedtuple from a list of values

print (row)   #Prints: Row(a=2, b=3, c=4)

...来自 - Python中的“命名元组”是什么？

- Mat Whiteside

Answer 4

这应该向您展示如何：

>>> from collections import namedtuple
>>> Test = namedtuple('Test', ['number_A', 'number_B'])
>>> test_1 = Test(number_A=1, number_B=2)
>>> test_2 = Test(number_A=3, number_B=4)
>>> test_3 = Test(number_A=5, number_B=6)
>>> lis = [x.number_A for x in (test_1, test_2, test_3)]
>>> lis
[1, 3, 5]
>>> print "\n".join(map(str, lis))
1
3
5
>>>

其实，你最好使用列表而不是编号变量：

>>> from collections import namedtuple
>>> Test = namedtuple('Test', ['number_A', 'number_B'])
>>> lis = []
>>> lis.append(Test(number_A=1, number_B=2))
>>> lis.append(Test(number_A=3, number_B=4))
>>> lis.append(Test(number_A=5, number_B=6))
>>> l = [x.number_A for x in lis]
>>> l
[1, 3, 5]
>>> print "\n".join(map(str, l))
1
3
5
>>>

- user2555451