Question

Under Windows, executing the following Python script I get an ERRORLEVEL of 0 instead of the expected 2.

import sys
import scipy.io

sys.exit(2)

If I remove the import scipy.io, I got the correct ERRORLEVEL of 2…

Any idea why importing scipy.io cause such an issue?

PS: windows 7, python 2.72, scipy 0.10.1

Calling help(sys.exit) just before the sys.exit call return the following (which seems to be good):

Help on built-in function exit in module sys: 

exit(...) 
    exit([status]) 

    Exit the interpreter by raising SystemExit(status). 
    If the status is omitted or None, it defaults to zero (i.e., success). 
    If the status is numeric, it will be used as the system exit status. 
    If it is another kind of object, it will be printed and the system 
    exit status will be one (i.e., failure).

If I call

sys.exit('Something wrong')

The string is printed but the system still return 0 as ERRORLEVEL instead of the 1 expected.

Answer 1

This appears to be due to a bug in SciPy. Here are some relevant tickets (only the first one is still open):

• http://projects.scipy.org/scipy/ticket/1314
• http://projects.scipy.org/scipy/ticket/1521
• http://projects.scipy.org/scipy/ticket/1485

One curious observation there is that

the bug disappears when importing weave.

Perhaps try importing scipy.weave to see if this workaround helps?