spyder: Debug mode not working on win10 for any code

Issue Report Checklist

• [Y] Searched the issues page for similar reports
• [Y] Read the relevant sections of the Spyder Troubleshooting Guide and followed its advice
• [Y] Reproduced the issue after updating with conda update spyder (or pip, if not using Anaconda)
• Could not reproduce inside jupyter qtconsole (if console-related)
• [Y] Tried basic troubleshooting (if a bug/error)
  • Restarted Spyder
  • Reset preferences with spyder --reset
  • 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

any code, such as a = 1 # you can see the traceback follow, the spyder hanging at the first line of the code b = 1 c = a + b All operations (such as step F10, continue to next breakpoint F12) not responding when spyder in debug mode. it seems like the IDE is hanging, all I can do is click the “Stop the current command” to exit the debug mode.

What steps reproduce the problem?

1. debug any code and try to step inside

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

the spyder can stop at the pre-setted break points, and can step the code

Paste Traceback/Error Below (if applicable)

debugfile('E:/Public2/paper/universalLAIEstimation/test.py', wdir='E:/Public2/paper/universalLAIEstimation')
> e:\public2\paper\universallaiestimation\test.py(6)<module>()
      4 
      5 @author: WIN
----> 6 """
      7 
      8 a = 1


--KeyboardInterrupt--

KeyboardInterrupt: Interrupted by user

Versions

• Spyder version: 4.1.2
• Python version: 3.7.7
• Qt version:
• PyQt version:
• Operating System name/version: win10 1909

Dependencies

NO DEPENDENCIES