Python 3.x 如何在python中使用_all__动态导出变量？

我有一个包含不同模型名的字典，我想将每个模型名导入并在其他模块（python文件）中使用

目前，我正在以这样一种不明智的方式固定代码：

a.py

MODELS = { 
            "REGISTER":"model register",
            "REGISTER_UNATH": "model register unauthorised",
            "REGISTER_HISTORY": "model register old record"
         }

# variables to export for use outside
REGISTER         = MODELS['REGISTER']
REGISTER_UNATH   = MODELS['REGISTER_UNATH']
REGISTER_HISTORY = MODELS['REGISTER_HISTORY']

__all__ = ['REGISTER', 'REGISTER_UNATH', 'REGISTER_HISTORY']

from a import *

print ("Check Model Register")
print (REGISTER)

print ("Check Model Register unauthorised")
print (REGISTER_UNATH)

print ("Check Model Register old record")
print (REGISTER_HISTORY)

b.py

MODELS = { 
            "REGISTER":"model register",
            "REGISTER_UNATH": "model register unauthorised",
            "REGISTER_HISTORY": "model register old record"
         }

# variables to export for use outside
REGISTER         = MODELS['REGISTER']
REGISTER_UNATH   = MODELS['REGISTER_UNATH']
REGISTER_HISTORY = MODELS['REGISTER_HISTORY']

__all__ = ['REGISTER', 'REGISTER_UNATH', 'REGISTER_HISTORY']

from a import *

print ("Check Model Register")
print (REGISTER)

print ("Check Model Register unauthorised")
print (REGISTER_UNATH)

print ("Check Model Register old record")
print (REGISTER_HISTORY)

然而，对于

a.py

我想动态地从模型字典中导出变量，因为该字典在将来会越来越多

所以，我做了一些类似的事情，但不起作用

MODELS = { 
            "REGISTER":"model register",
            "REGISTER_UNATH": "model register unauthorised",
            "REGISTER_HISTORY": "model register old record"
         }

# variables to export for use outside

modelist = []

for model, modelDesc in MODELS.items():

    # append to list ready for export
    modelist.append(model)

# export for using outside
__all__ = modelist

然后通过

python b.py

，我得到了这个错误

Traceback (most recent call last):
  File "b.py", line 1, in <module>
    from a import *
AttributeError: module 'a' has no attribute 'REGISTER'

回溯（最近一次呼叫最后一次）：
文件“b.py”，第1行，在
从进口*
AttributeError:模块“a”没有属性“REGISTER”

---

谢谢。

您是否尝试过执行

globals（）.update（型号）__所有参数=列表（MODELS.keys（））

？

# turn the key-value pairs in `MODELS` into variable-value pairs
globals().update(MODELS)

# record those variable names in `__all__`
__all__ = list(MODELS.keys())