Vaex process stuck in the Spyder IPython console (only)

Issue Report Checklist

• Searched the issues page for similar reports
• Read the relevant sections of the Spyder Troubleshooting Guide and followed its advice
• Reproduced the issue after updating with conda update spyder (or pip, if not using Anaconda)
• Could not reproduce inside jupyter qtconsole (if console-related)
• Tried basic troubleshooting (if a bug/error)
  • Restarted Spyder
  • Reset preferences with spyder --reset (fixed the problem with inline graphics, see below)
  • Reinstalled the latest version of Anaconda
  • Tried the other applicable steps from the Troubleshooting Guide
• Completed the Problem Description, Steps to Reproduce and Version sections below

Problem Description

Spyder IPython console process becomes stuck when computing a mean with vaex. Does not happen with other IDEs / Consoles. Somehow, it may be related to the output graphics mode of the Spyder iPython console (see below)

What steps reproduce the problem?

Minimal error :

import numpy as np
import vaex
df = vaex.from_dict({"E":np.random.rand(1000)})
print(df)
print("before EQ mean")
E_bins = df.mean("E", binby="E", shape=10)
print("after EQ mean")       # 👈 I never get to here

Script works well if

• ran from an Ipython ( 7.22.0) console in the terminal
• ran from Python in the terminal
• ran from VS Code
• ran from Jupyter Lab (3.0.14)
• ran in Jupyter QtConsole

As pointed out by @minouHub , opening a new Spyder IPython console unlocks the process. If console has been “unlocked”, I can even re-run the script another time before it gets stuck again. (?)

Last thing : although no graphics are plot anywhere in this example, this problem appears when my iPython console has Qt5 output graphics. It does not appear with Inline graphics (tried both consistently 3 times)

Versions

spyder
spyder-kernels 2.0.5 py38haa95532_0 ipython 7.22.0 py38hd4e2768_0

on Windows.

Spyder installed through Anaconda

• Spyder version: 5.0.5 py38haa95532_2
• Python version: 3.8.8
• Qt version: 5.9.7 vc14h73c81de_0
• PyQt version: 1.9.0
• Operating System name/version: Windows 10

[erwanp]

Tested right now ; everything works properly with Vaex 4.8

Vaex 4.8 is officially released so we can consider this issue fixed.

Thank you @maartenbreddels @ccordoba12

[maartenbreddels]

If you install the latest alpha, you can try this trick https://github.com/vaexio/vaex/pull/1546#issuecomment-935535045 to see if it does not get stuck (that might tell you that nest_asyncio is the problem).