为什么在 Python 中创建命名元组 object 后无法读取“类型名称”

Question

This query is further with reference to this query

So, I am trying to execute the following code:

from collections import *

tp = namedtuple('emp', 'eid enames mob')
print(tp)
print(emp)

I can execute print(tp) and the output generated is <class '__main__.emp'> .

But when I try to execute print(emp) , It generates the following exception:

Traceback (most recent call last):
  File "a.py", line 5, in <module>
    print(emp)
NameError: name 'emp' is not defined

What is the reason. The class emp is created. But I can not figure out how to access it directly. Or can I not?

So basically, I can create instance of tp as tp() but not instances of emp in the same way. Why?

Answer 1

Option 1: Just repeat the type name when assigning to the returned type

tp = emp = namedtuple('emp', 'eid enames mob')

Option 2 : Use a declarative style instead of the functional APIs

from typing import NamedTuple

class emp(NamedTuple):
    eid: str
    enames: str
    mob: str