debugging threads doesn't work in Spyder

Problem Description

I am trying to debug one of my multi-threaded programs in Python 2.7 with Anaconda distribution on Spyder 3.2 (latest release came from Anaconda package)- when the threads are started, IDE is unable to hit any breakpoints and the program runs in normal mode cannot do step by step debugging either.

• the same issue I observed in Pycharm as well. however, if I change the python version from Anaconda to normal python which is again ver 2.7, it works perfectly fine in pycharm. The same in Spyder as Ipython and cloud pickle was there.

What steps reproduce the problem?

1. check any multi-threaded program in Anaconda installation in spyder, try to debug step mode after threads are started.
2. the same program if you run in a pure python (not Anaconda distribution) and different IDE it works fine.

What is the expected output? What do you see instead?

Unable to hit break-points after threads are started

Paste Traceback/Error Below (if applicable)

PASTE TRACEBACK HERE

Versions

• Spyder version: 3.2
• Python version: 2.7
• Qt version:
• PyQt version:
• Operating System name/version:

Dependencies

PASTE DEPENDENCIES HERE

[cg-mayrhofer]

On Spyder 4.2.5 the command import pdb; pdb.set_trace() works and the debugger enters the thread. Thanks to @dalthviz for the advise. Anyway I had to use pdb and not ipdb…

[CAM-Gerlach]

@dalthviz I had tested pdb.set_trace() and breakpoint() as well, and again debugging stopped at the breakpiont but immediately excited with bdb.BdbQuit.