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RigExpert AA-35 - Interpreting The Information

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Why is “attempted relative import beyond top-level package” ValueError, not ImportError?

2

When I do a relative import beyond the top level package, I get an exception — no surprise there. But why is it a ValueError and not an ImportError?

$ find .
.
./b
./b/c.py
./b/__init__.py
./a.py
$ cat a.py
import b.c
$ cat b/c.py
from .. import time_machine
$ python a.py
Traceback (most recent call last):
 File "a.py", line 1, in <module>
 import b.c
 File "/tmp/a/b/c.py", line 1, in <module>
 from .. import time_machine
ValueError: Attempted relative import beyond toplevel package

I would have expected an ImportError, because this exception is related to importing packages, and that normally gives ImportError (or its subclass ModuleNotFoundError). What is the rationale here?

python package importerror valueerror relative-import

share|improve this question

asked Mar 7 at 16:32

gerritgerrit

7,57054792

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I suspect that the rationale is that the value being passed to the import machinery illegal, hence ValueError. If the value was legal but the module unimportable or didn't exist you'd get an ImportError.
  
  – snakecharmerb
  Mar 8 at 7:59
  

  
  
  
  

add a comment | 

2

When I do a relative import beyond the top level package, I get an exception — no surprise there. But why is it a ValueError and not an ImportError?

$ find .
.
./b
./b/c.py
./b/__init__.py
./a.py
$ cat a.py
import b.c
$ cat b/c.py
from .. import time_machine
$ python a.py
Traceback (most recent call last):
 File "a.py", line 1, in <module>
 import b.c
 File "/tmp/a/b/c.py", line 1, in <module>
 from .. import time_machine
ValueError: Attempted relative import beyond toplevel package

I would have expected an ImportError, because this exception is related to importing packages, and that normally gives ImportError (or its subclass ModuleNotFoundError). What is the rationale here?

python package importerror valueerror relative-import

share|improve this question

asked Mar 7 at 16:32

gerritgerrit

7,57054792

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I suspect that the rationale is that the value being passed to the import machinery illegal, hence ValueError. If the value was legal but the module unimportable or didn't exist you'd get an ImportError.
  
  – snakecharmerb
  Mar 8 at 7:59
  

  
  
  
  

add a comment | 

When I do a relative import beyond the top level package, I get an exception — no surprise there. But why is it a ValueError and not an ImportError?

$ find .
.
./b
./b/c.py
./b/__init__.py
./a.py
$ cat a.py
import b.c
$ cat b/c.py
from .. import time_machine
$ python a.py
Traceback (most recent call last):
 File "a.py", line 1, in <module>
 import b.c
 File "/tmp/a/b/c.py", line 1, in <module>
 from .. import time_machine
ValueError: Attempted relative import beyond toplevel package

I would have expected an ImportError, because this exception is related to importing packages, and that normally gives ImportError (or its subclass ModuleNotFoundError). What is the rationale here?

python package importerror valueerror relative-import

share|improve this question

asked Mar 7 at 16:32

gerritgerrit

7,57054792

$ find .
.
./b
./b/c.py
./b/__init__.py
./a.py
$ cat a.py
import b.c
$ cat b/c.py
from .. import time_machine
$ python a.py
Traceback (most recent call last):
 File "a.py", line 1, in <module>
 import b.c
 File "/tmp/a/b/c.py", line 1, in <module>
 from .. import time_machine
ValueError: Attempted relative import beyond toplevel package

share|improve this question

asked Mar 7 at 16:32

gerritgerrit

7,57054792

share|improve this question

asked Mar 7 at 16:32

gerritgerrit

7,57054792

asked Mar 7 at 16:32

gerritgerrit

7,57054792

asked Mar 7 at 16:32

gerritgerrit

7,57054792