Cannot run Spyder because No module named 'PySide'

Question

I wanted to try using Spyder IDE. I was reading this page on how to open and run Spyder: https://github.com/spyder-ide/spyder/releases

I typed the following commands as specified in the page:

conda update qt pyqt
conda update spyder

Both commands gave "# All requested packages already installed.".

I then typed spyder into my terminal (Mac):

Macs-MacBook:~ macuser$ spyder
Traceback (most recent call last):
  File "/anaconda3/lib/python3.6/site-packages/qtpy/__init__.py", line 166, in <module>
    from PySide import __version__ as PYSIDE_VERSION  # analysis:ignore
ModuleNotFoundError: No module named 'PySide'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/anaconda3/bin/spyder", line 11, in <module>
    sys.exit(main())
  File "/anaconda3/lib/python3.6/site-packages/spyder/app/start.py", line 159, in main
    from spyder.app import mainwindow
  File "/anaconda3/lib/python3.6/site-packages/spyder/app/mainwindow.py", line 49, in <module>

So, I tried to install PySide:

Macs-MacBook:~ macuser$ conda install PySide
Solving environment: failed

UnsatisfiableError: The following specifications were found to be in conflict:
  - anaconda==5.2.0=py36_3
  - pyside
Use "conda info <package>" to see the dependencies for each package.

What should I do to get up and running with Spyder?

Solution 1

try below commands let me know if it works.

 pip install msgpack
 conda install qt=5.6 pyqt=5.6 sip=4.18

Solution 2

While other solutions found on the web didn't work for me (such as the one above and using $ pip install pyqt5), I solved this by uninstalling and reinstalling Spyder via terminal, using pip.

---

$ pip uninstall spyder
...

---

$ pip install spyder
...

---

Not sure why, but it worked on the first try.

Solution 3

Mr J.

I had the same problem as Doug Fir. I used these commands. I launched spyder from the DOS prompt. I got "RuntimeError: module compiled against API version 0xb but this version of numpy is 0xa" as was the case before. Just as I was rolling my eyes, Spyder went ahead and started. So I think it worked.

Comments

[Doug Fir]

Hi, I'm using anaconda. I'm new to python but the docs and various resources I've read over the past few days have consistently told me to not use pip while I have anaconda. Is this true?

[Doug Fir]

Thank you! This worked with the conda command option that you provided. How did you know to use conda install qt=5.6 pyqt=5.6 sip=4.18? It's pretty specific

[jits_on_moon]

please mark answer so that it will be useful for others. basically, you can execute below command to understand which specific version is installed on your machine. conda list --show-channel-urls

[AMC]

Can you explain what the issue is, and why this works?

[endolith]

You should be using conda to install msgpack, not pip