No module named 'qasm_controller_wrapper' about qiskit-aer HOT 10 CLOSED

How exactly are you trying to install the package?

I've run into a similar issue when trying to build form source; installing the generated wheel to the system or user pip gave this error, but installing to a virtualenv worked fine.

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I installed using pip; specifically, using "pip install qiskit" (i.e., without the --user flag).

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Hui @sumeetkhatri , just to make sure everything is clean before installing, could you try this?

$ conda create -y -n qiskit python=3.6
$ conda activate qiskit
$ pip install qiskit

... which basically installs qiskit in a clean virtual env.

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Is there a way to do this without having to install anaconda?

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Sure:

$ virtualenv -p python3.6 envname
$ source envname/bin/activate
$ pip install qiskit

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I get the following error upon executing those three lines:

Collecting qiskit
Using cached https://files.pythonhosted.org/packages/7a/4a/bc00cc835794bb5247146d895586284759fe8e726648cfbb2f977e484bec/qiskit-0.7.2.tar.gz
Collecting qiskit-terra<0.8,>=0.7 (from qiskit)
Using cached https://files.pythonhosted.org/packages/af/61/b54f52ada993927c93adf8fea565951456f4ea691d6b0adca9ef52a04060/qiskit_terra-0.7.0-cp36-cp36m-manylinux1_x86_64.whl
Collecting qiskit-aer<0.2,>=0.1 (from qiskit)
Using cached https://files.pythonhosted.org/packages/19/51/c93d33f5154305d177754507f05d113e13695a93500db38e1224633b9035/qiskit_aer-0.1.1-cp36-cp36m-manylinux1_x86_64.whl
Collecting marshmallow-polyfield<4,>=3.2 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/fa/ba/6406b8cce3e42b2838d234310c3605627083bbb8f71dcc312c616480fe92/marshmallow_polyfield-3.2-py2.py3-none-any.whl
Collecting marshmallow<3,>=2.16.3 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/9a/3c/4cc463c53136dc503f9ee234c4a6592e1c7411cb362f844e80df70361f29/marshmallow-2.18.0-py2.py3-none-any.whl
Collecting scipy!=0.19.1,>=0.19 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/7f/5f/c48860704092933bf1c4c1574a8de1ffd16bf4fde8bab190d747598844b2/scipy-1.2.1-cp36-cp36m-manylinux1_x86_64.whl
Collecting jsonschema<2.7,>=2.6 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/77/de/47e35a97b2b05c2fadbec67d44cfcdcd09b8086951b331d82de90d2912da/jsonschema-2.6.0-py2.py3-none-any.whl
Collecting networkx>=2.2 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/f3/f4/7e20ef40b118478191cec0b58c3192f822cace858c19505c7670961b76b2/networkx-2.2.zip
Collecting ply>=3.10 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/a3/58/35da89ee790598a0700ea49b2a66594140f44dec458c07e8e3d4979137fc/ply-3.11-py2.py3-none-any.whl
Collecting sympy>=1.3 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/dd/f6/ed485ff22efdd7b371d0dbbf6d77ad61c3b3b7e0815a83c89cbb38ce35de/sympy-1.3.tar.gz
Collecting numpy>=1.13 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/f5/bf/4981bcbee43934f0adb8f764a1e70ab0ee5a448f6505bd04a87a2fda2a8b/numpy-1.16.1-cp36-cp36m-manylinux1_x86_64.whl
Collecting pillow>=4.2.1 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/85/5e/e91792f198bbc5a0d7d3055ad552bc4062942d27eaf75c3e2783cf64eae5/Pillow-5.4.1-cp36-cp36m-manylinux1_x86_64.whl
Collecting requests>=2.19 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/7d/e3/20f3d364d6c8e5d2353c72a67778eb189176f08e873c9900e10c0287b84b/requests-2.21.0-py2.py3-none-any.whl
Collecting requests-ntlm>=1.1.0 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/03/4b/8b9a1afde8072c4d5710d9fa91433d504325821b038e00237dc8d6d833dc/requests_ntlm-1.1.0-py2.py3-none-any.whl
Collecting psutil>=5 (from qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/6e/a0/833bcbcede5141cc5615e50c7cc5b960ce93d9c9b885fbe3b7d36e48a2d4/psutil-5.5.0.tar.gz
Collecting decorator>=4.3.0 (from networkx>=2.2->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/f1/cd/7c8240007e9716b14679bc217a1baefa4432aa30394f7e2ec40a52b1a708/decorator-4.3.2-py2.py3-none-any.whl
Collecting mpmath>=0.19 (from sympy>=1.3->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/ca/63/3384ebb3b51af9610086b23ea976e6d27d6d97bf140a76a365bd77a3eb32/mpmath-1.1.0.tar.gz
Collecting urllib3<1.25,>=1.21.1 (from requests>=2.19->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/62/00/ee1d7de624db8ba7090d1226aebefab96a2c71cd5cfa7629d6ad3f61b79e/urllib3-1.24.1-py2.py3-none-any.whl
Collecting idna<2.9,>=2.5 (from requests>=2.19->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/14/2c/cd551d81dbe15200be1cf41cd03869a46fe7226e7450af7a6545bfc474c9/idna-2.8-py2.py3-none-any.whl
Collecting chardet<3.1.0,>=3.0.2 (from requests>=2.19->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/bc/a9/01ffebfb562e4274b6487b4bb1ddec7ca55ec7510b22e4c51f14098443b8/chardet-3.0.4-py2.py3-none-any.whl
Collecting certifi>=2017.4.17 (from requests>=2.19->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/9f/e0/accfc1b56b57e9750eba272e24c4dddeac86852c2bebd1236674d7887e8a/certifi-2018.11.29-py2.py3-none-any.whl
Collecting cryptography>=1.3 (from requests-ntlm>=1.1.0->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/98/71/e632e222f34632e0527dd41799f7847305e701f38f512d81bdf96009bca4/cryptography-2.5-cp34-abi3-manylinux1_x86_64.whl
Collecting ntlm-auth>=1.0.2 (from requests-ntlm>=1.1.0->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/8e/5b/4047779fb456b0de503c4acb7b166becf2567efb772abb53998440791d3c/ntlm_auth-1.2.0-py2.py3-none-any.whl
Collecting six>=1.4.1 (from cryptography>=1.3->requests-ntlm>=1.1.0->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/73/fb/00a976f728d0d1fecfe898238ce23f502a721c0ac0ecfedb80e0d88c64e9/six-1.12.0-py2.py3-none-any.whl
Collecting asn1crypto>=0.21.0 (from cryptography>=1.3->requests-ntlm>=1.1.0->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/ea/cd/35485615f45f30a510576f1a56d1e0a7ad7bd8ab5ed7cdc600ef7cd06222/asn1crypto-0.24.0-py2.py3-none-any.whl
Collecting cffi!=1.11.3,>=1.8 (from cryptography>=1.3->requests-ntlm>=1.1.0->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/6d/c0/47db8f624f3e4e2f3f27be03a93379d1ba16a1450a7b1aacfa0366e2c0dd/cffi-1.11.5-cp36-cp36m-manylinux1_x86_64.whl
Collecting pycparser (from cffi!=1.11.3,>=1.8->cryptography>=1.3->requests-ntlm>=1.1.0->qiskit-terra<0.8,>=0.7->qiskit)
Using cached https://files.pythonhosted.org/packages/68/9e/49196946aee219aead1290e00d1e7fdeab8567783e83e1b9ab5585e6206a/pycparser-2.19.tar.gz
Building wheels for collected packages: qiskit, networkx, sympy, psutil, mpmath, pycparser
Building wheel for qiskit (setup.py) ... done
Exception:
Traceback (most recent call last):
File "/home/sumeet/envname/lib/python3.6/site-packages/pip/_internal/cli/base_command.py", line 179, in main
status = self.run(options, args)
File "/home/sumeet/envname/lib/python3.6/site-packages/pip/_internal/commands/install.py", line 355, in run
session=session, autobuilding=True
File "/home/sumeet/envname/lib/python3.6/site-packages/pip/_internal/wheel.py", line 980, in build
python_tag=python_tag,
File "/home/sumeet/envname/lib/python3.6/site-packages/pip/_internal/wheel.py", line 813, in _build_one
python_tag=python_tag)
File "/home/sumeet/envname/lib/python3.6/site-packages/pip/_internal/wheel.py", line 821, in _build_one_inside_env
wheel_path = builder(req, temp_dir.path, python_tag=python_tag)
File "/home/sumeet/envname/lib/python3.6/site-packages/pip/_internal/wheel.py", line 898, in _build_one_legacy
return os.path.join(tempd, sorted(os.listdir(tempd))[0])
IndexError: list index out of range

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There's something wrong in your environment, try updating pip in the first place:

pip install --upgrade pip

And then run again:

pip install --no-cache-dir qiskit

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Ok, the import statement now works.

The solution isn't entirely satisfactory. Why do I need to run it in a virtual environment?

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You don't need to, actually. But this is a common good practice in the Python realm, because otherwise there could be other packages that require different versions of your depedencies that could potentially conflict with yours, so there's this recommendation to create "isolated" environments where you install exactly what you need in a controlled way.
Unfortunately, there's nothing much we con do about it.
I just wanted to make sure that from the point of view of the package (qiskit) everything was right, and it is.

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I'm closing this issue, feel free to reopen it whenever you want.

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