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pyvisa / pyvisa-py

A pure python PyVISA backend
https://pyvisa-py.readthedocs.io
MIT License
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Wrapper not found: No package named pyvisa-py #122

Closed Harshit1622 closed 6 years ago

Harshit1622 commented 6 years ago

Hello Anyone,

Please guide us on below error. Wrapper not found: No package named pyvisa-py

Code: import visa rm = visa.ResourceManager('@py')

Thanks, Harshit

MatthieuDartiailh commented 6 years ago

How did you install pyvisa and pyvisa-py ?

Harshit1622 commented 6 years ago

Thanks for replying..

I have run below commands: Pip install pyvisa-py Pip install -U pyvisa

MatthieuDartiailh commented 6 years ago

Could you post the output of python -m visa info ? I am not sure what is happening here.

natevillaume commented 6 years ago

I have the same problem. I cannot specify the pyvisa-py library. I used the same install commands...

output from python -m visa info:

python3 -m visa info Machine Details: Platform ID: Darwin-16.7.0-x86_64-i386-64bit Processor: i386

Python: Implementation: CPython Executable: /Library/Frameworks/Python.framework/Versions/3.6/bin/python3 Version: 3.6.3 Compiler: GCC 4.2.1 (Apple Inc. build 5666) (dot 3) Bits: 64bit Build: Oct 3 2017 00:32:08 (#v3.6.3:2c5fed86e0) Unicode: UCS4

PyVISA Version: 1.9.0

Backends: ni: Version: 1.9.0 (bundled with PyVISA)

1: /Library/Frameworks/visa.framework/visa:

     found by: auto
     bitness: 32, 64
     Vendor: National Instruments
     Impl. Version: 14680064
     Spec. Version: 5243904

py: Could not instantiate backend -> No backend available

MatthieuDartiailh commented 6 years ago

Could you post the output of pip list ?

natevillaume commented 6 years ago

$ pip list

Package Version

asn1crypto 0.23.0

aws-xray-sdk 0.94

boto 2.48.0

boto3 1.4.7

botocore 1.7.46

certifi 2017.11.5

cffi 1.11.2

chardet 3.0.4

cookies 2.2.1

cryptography 2.1.3

docker 2.6.1

docker-pycreds 0.2.1

docutils 0.14

et-xmlfile 1.0.1

idna 2.6

jdcal 1.3

Jinja2 2.10

jmespath 0.9.3

jsonpickle 0.9.5

MarkupSafe 1.0

mock 2.0.0

moto 1.1.24

numpy 1.13.3

openpyxl 2.4.9

pandas 0.21.0

pbr 3.1.1

pip 10.0.1

py 1.5.2

pyaml 17.10.0

pycparser 2.18

pytest 3.2.5

python-dateutil 2.6.1

pytz 2017.3

pyusb 1.0.2

PyVISA 1.9.0

PyVISA-py 0.2

PyYAML 3.12

requests 2.18.4

s3transfer 0.1.11

setuptools 36.7.2

six 1.11.0

urllib3 1.22

websocket-client 0.44.0

Werkzeug 0.12.2

wrapt 1.10.11

xmltodict 0.11.0

On Sat, May 26, 2018 at 2:10 PM Matthieu Dartiailh notifications@github.com wrote:

Could you post the output of pip list ?

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/pyvisa/pyvisa-py/issues/122#issuecomment-392288368, or mute the thread https://github.com/notifications/unsubscribe-auth/AMcKYSatLvXm95rcSYk2TC25R9R_2Aziks5t2cTdgaJpZM4RQeA_ .

MatthieuDartiailh commented 6 years ago

I really don't understand what causes this issue. Can you try to install the latest develoment version ?

pip uninstall pyvisa-py
pip install https://github.com/pyvisa/pyvisa-py/tarball/master

And post the output of pyvisa-info (equivalent to python -m visa info).

natevillaume commented 6 years ago

$ pip uninstall pyvisa-py

Uninstalling PyVISA-py-0.2:

Would remove:

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/PyVISA_py-0.2-py3.6.egg-info

/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pyvisa-py/*

Proceed (y/n)? y

Successfully uninstalled PyVISA-py-0.2

$ pip install https://github.com/pyvisa/pyvisa-py/tarball/master

Collecting https://github.com/pyvisa/pyvisa-py/tarball/master

Downloading https://github.com/pyvisa/pyvisa-py/tarball/master

 \ 61kB 1.0MB/s

Requirement already satisfied: pyvisa>=1.8 in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (from PyVISA-py==0.3.dev0) (1.9.0)

Installing collected packages: PyVISA-py

Running setup.py install for PyVISA-py ... done

Successfully installed PyVISA-py-0.3.dev0

LMC-062271:~$ pyvisa-info

Machine Details:

Platform ID: Darwin-16.7.0-x86_64-i386-64bit

Processor: i386

Python:

Implementation: CPython

Executable: /Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6

Version: 3.6.3

Compiler: GCC 4.2.1 (Apple Inc. build 5666) (dot 3)

Bits: 64bit

Build: Oct 3 2017 00:32:08 (#v3.6.3:2c5fed86e0)

Unicode: UCS4

PyVISA Version: 1.9.0

Backends:

ni:

  Version: 1.9.0 (bundled with PyVISA)

  #1: /Library/Frameworks/visa.framework/visa:

     found by: auto

     bitness: 32, 64

     Vendor: National Instruments

     Impl. Version: 14680064

     Spec. Version: 5243904

py:

  Version: 0.3.dev0

  ASRL INSTR:

     Please install PySerial (>=3.0) to use this resource type.

     No module named 'serial'

  USB INSTR:

     PyUSB does not seem to be properly installed.

     Please refer to PyUSB documentation and

     install a suitable backend like

     libusb 0.1, libusb 1.0, libusbx,

     libusb-win32 or OpenUSB.

     No backend available

  USB RAW:

     PyUSB does not seem to be properly installed.

     Please refer to PyUSB documentation and

     install a suitable backend like

     libusb 0.1, libusb 1.0, libusbx,

     libusb-win32 or OpenUSB.

     No backend available

  TCPIP INSTR: Available

  TCPIP SOCKET: Available

  GPIB INSTR:

     Please install linux-gpib to use this resource type.

     No module named 'gpib'

On Fri, Jun 1, 2018 at 12:37 PM Matthieu Dartiailh notifications@github.com wrote:

I really don't understand what causes this issue. Can you try to install the latest develoment version ?

pip uninstall pyvisa-py pip install https://github.com/pyvisa/pyvisa-py/tarball/master

And post the output of `pyvisa-info(equivalent topython -m visa info).

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/pyvisa/pyvisa-py/issues/122#issuecomment-393988070, or mute the thread https://github.com/notifications/unsubscribe-auth/AMcKYZ4CdLS28tHpLmCaifeJy_eYGm_Bks5t4ZgVgaJpZM4RQeA_ .

MatthieuDartiailh commented 6 years ago

Looks like re-installing fixed your issue. To enable any backend in addition to the TCPIP one please have a look at the documentation. Feel free to re-open if needed.

HITTIH commented 5 years ago

hello, I encountered this problem too,and I tried the above methods,and it didn't work ,But once I run it the way below, it works.

>>> import visa
>>> rm = visa.ResourceManager('@py')
>>> eload = rm.open_resource('TCPIP0::10.44.90.19::INSTR')
>>> eload.query('*IDN?')
'Chroma,63210A-150-1000,63210AL00087,1.25,1.01,1.01\n'

if I run it in this way "python xxxx.py"(which has the same code ), it didn't work

a1abhisheks commented 5 years ago

I really don't understand what causes this issue. Can you try to install the latest develoment version ?

pip uninstall pyvisa-py
pip install https://github.com/pyvisa/pyvisa-py/tarball/master

And post the output of pyvisa-info (equivalent to python -m visa info).

Hi MatthieuDartiailh,

this solution worked greatly just 1 point i wants to add that after this i have to install this also

pip install gpib-ctypes

after this i can connect my system with Agilent 8960 using NI GPIB Cable and perform RF measurement for TX Power of mobile phone on EGSM900 and DCS1800