ModuleNotFoundError: No module named 'cassandra.cluster'; 'cassandra' is not a package

[Morten Bjoernsvik]

Hi

When trying to start up cassandra today I got the following:

python3.7.3, windows10 pro 64bit,

I've removed the __pycache__ dir, and reinstalled:

(bptools) PS C:\dist\work\bptools> pip install cassandra-driver --force
Collecting cassandra-driver
  Using cached https://files.pythonhosted.org/packages/1b/05/7af4db63dcc0f0cc72855f2b31daa07517cc6668d214d52134c44810cf58/cassandra-driver-3.18.0.tar.gz
Collecting six>=1.9 (from cassandra-driver)
  Using cached https://files.pythonhosted.org/packages/73/fb/00a976f728d0d1fecfe898238ce23f502a721c0ac0ecfedb80e0d88c64e9/six-1.12.0-py2.py3-none-any.whl
Installing collected packages: six, cassandra-driver
  Found existing installation: six 1.12.0
    Uninstalling six-1.12.0:
      Successfully uninstalled six-1.12.0
  Found existing installation: cassandra-driver 3.18.0
    Uninstalling cassandra-driver-3.18.0:
      Successfully uninstalled cassandra-driver-3.18.0
  Running setup.py install for cassandra-driver ... done
Successfully installed cassandra-driver-3.18.0 six-1.12.0


(bptools) PS C:\dist\work\bptools> pip freeze | findstr cassandra
cassandra-driver==3.18.0


python.exe -vv .\bptools\cassandra.py

# C:\dist\work\bptools\bptools\__pycache__\cassandra.cpython-37.pyc matches C:\dist\work\bptools\bptools\cassandra.py
# code object from 'C:\\dist\\work\\bptools\\bptools\\__pycache__\\cassandra.cpython-37.pyc'
Traceback (most recent call last):
  File ".\bptools\cassandra.py", line 12, in <module>
    from cassandra.cluster import Cluster
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "C:\dist\work\bptools\bptools\cassandra.py", line 12, in <module>
    from cassandra.cluster import Cluster
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 962, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'cassandra.cluster'; 'cassandra' is not a package

[Alan Boudreault]

Hello,

It looks like your issue is related to the name of your file: cassandra.py. The Python script is trying to import itself.

$ cat test/cassandra.py 

from cassandra.cluster import Cluster

$ python test/cassandra.py

Traceback (most recent call last):

  File "test/cassandra.py", line 1, in <module>
    from cassandra.cluster import Cluster
  File "/tmp/test/cassandra.py", line 1, in <module>
    from cassandra.cluster import Cluster

ModuleNotFoundError: No module named 'cassandra.cluster'; 'cassandra' is not a package

$ mv test/cassandra.py test/cass.py
$ python test/cass.py

$

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Alan Boudreault

Software Engineer (Drivers) | alan.bo...@datastax.com