[PATCH v2 6/7] test_nvmet.py: test_invalid_input fails for py3

[Tony Asleson <tasleson@redhat.com>]

When you run 'make test' using python 3 the unit test
test_invalid_input fails with:

Traceback (most recent call last):
  File "/someuser/projects/nvmetcli/nvmet/test_nvmet.py", line 395, in
test_invalid_input
    for i in range(l))
  File "/someuser/projects/nvmetcli/nvmet/test_nvmet.py", line 395, in
<genexpr>
    for i in range(l))
AttributeError: module 'string' has no attribute 'lowercase'

Python 3 does not have 'string.lowercase' ref.
https://docs.python.org/3/library/string.html

Python 2 does ref.
https://docs.python.org/2/library/string.html

Both have "string.ascii_lowercase" so lets leverage that to
support both.

Signed-off-by: Tony Asleson <tasleson@redhat.com>
---
 nvmet/test_nvmet.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nvmet/test_nvmet.py b/nvmet/test_nvmet.py
index 5caa546..aae4a86 100644
--- a/nvmet/test_nvmet.py
+++ b/nvmet/test_nvmet.py
@@ -391,7 +391,7 @@ class TestNvmet(unittest.TestCase):
                           nqn='/', mode='create')
 
         for l in [ 257, 512, 1024, 2048 ]:
-            toolong = ''.join(random.choice(string.lowercase)
+            toolong = ''.join(random.choice(string.ascii_lowercase)
                               for i in range(l))
             self.assertRaises(nvme.CFSError, nvme.Subsystem,
                               nqn=toolong, mode='create')
-- 
2.25.1


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