Universal garbage: debugger does not even work on the simplest possible example

[xuancong84]

In line-by-line debugging mode, the standard output is gone. Thus, the debugger does not even work on the following simplest possible code:

%%pixie_debugger
import os, sys
import torch

print("Hello world", flush=True)

for i in range(10):
    j=i**2
    print("This is %d : %d"%(i,j))

Expected output:

Hello world

This is 0 : 0
This is 1 : 1
This is 2 : 4
This is 3 : 9
This is 4 : 16
This is 5 : 25
This is 6 : 36
This is 7 : 49
This is 8 : 64
This is 9 : 81

Actual output (line-by-line debugging for i=0,1,2,3):

> (4)pixie_run()
-> import os, sys


> (7)pixie_run()
-> print("Hello world", flush=True)

> (9)pixie_run()
-> for i in range(10):

This is 4 : 16
This is 5 : 25
This is 6 : 36
This is 7 : 49
This is 8 : 64
This is 9 : 81

As you can see, the output for printing "Hello world" and for i=0,1,2,3 in the for-loop is gone if I use line-by-line debugging.