Programs using Qiskit fail to run with Scalene >1.5.31.1

[fpietra]

Describe the bug
Profiling with Scalene 1.5.34 causes programs importing the Qiskit library to not run correctly. The program exits as soon as Qiskit is imported with the error:

Error in program being profiled:
 'PosixPath' object is not subscriptable

This is a regression from previous Scalene versions: 1.5.31.1 works correctly.

To Reproduce
Consider this simple program:

$ cat scalene_check.py 
from qiskit import QuantumCircuit

print("done")

This runs correctly:

$ python scalene_check.py 
done

Profiling with Scalene, I get the TypeError: 'PosixPath' object is not subscriptable. Here is the full program and profiler output:

$ scalene scalene_check.py --outfile profile.txt              
Error in program being profiled:
 'PosixPath' object is not subscriptable
Traceback (most recent call last):
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/scalene/scalene_profiler.py", line 1709, in profile_code
    exec(code, the_globals, the_locals)
  File "/home/vscode/scalene_check.py", line 1, in <module>
    from qiskit import QuantumCircuit
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/qiskit/__init__.py", line 87, in <module>
    from qiskit.execute_function import execute
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/qiskit/execute_function.py", line 25, in <module>
    from qiskit.compiler import transpile, schedule
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/qiskit/compiler/__init__.py", line 31, in <module>
    from .transpiler import transpile
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/qiskit/compiler/transpiler.py", line 33, in <module>
    from qiskit.transpiler.passes.synthesis.high_level_synthesis import HLSConfig
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/qiskit/transpiler/passes/__init__.py", line 214, in <module>
    from .optimization import Optimize1qGates
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/qiskit/transpiler/passes/optimization/__init__.py", line 19, in <module>
    from .consolidate_blocks import ConsolidateBlocks
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/qiskit/transpiler/passes/optimization/consolidate_blocks.py", line 29, in <module>
    from qiskit.transpiler.passes.synthesis import unitary_synthesis
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/qiskit/transpiler/passes/synthesis/__init__.py", line 15, in <module>
    from .unitary_synthesis import UnitarySynthesis
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/qiskit/transpiler/passes/synthesis/unitary_synthesis.py", line 43, in <module>
    from qiskit.transpiler.passes.synthesis import plugin
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/qiskit/transpiler/passes/synthesis/plugin.py", line 279, in <module>
    import stevedore
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/stevedore/__init__.py", line 11, in <module>
    from .extension import ExtensionManager
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/stevedore/extension.py", line 19, in <module>
    from . import _cache
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/stevedore/_cache.py", line 203, in <module>
    _c = Cache()
  File "/opt/conda/envs/aurora-py310/lib/python3.10/site-packages/stevedore/_cache.py", line 147, in __init__
    sys.executable[0:4] == '/tmp']):
TypeError: 'PosixPath' object is not subscriptable
$ cat profile.txt 
                                     Memory usage: ▄▄▅██ (max: 20.316 MB, growth rate: 101%)                                     
                        /home/vscode/scalene_check.py: % of time = 100.00% (485.960ms) out of 485.960ms.                         
       ╷       ╷       ╷       ╷        ╷       ╷               ╷       ╷                                                        
       │Time   │–––––– │–––––– │Memory  │–––––– │–––––––––––    │Copy   │                                                        
  Line │Python │native │system │Python  │peak   │timeline/%     │(MB/s) │/home/vscode/scalene_check.py                           
╺━━━━━━┿━━━━━━━┿━━━━━━━┿━━━━━━━┿━━━━━━━━┿━━━━━━━┿━━━━━━━━━━━━━━━┿━━━━━━━┿━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╸
     1 │   38% │   59% │   4%  │  99%   │   20M │▄█ 100%        │  1328 │from qiskit import QuantumCircuit                       
     2 │       │       │       │        │       │               │       │                                                        
     3 │       │       │       │        │       │               │       │print("done")                                           
     4 │       │       │       │        │       │               │       │                                                        
       ╵       ╵       ╵       ╵        ╵       ╵               ╵       ╵                                                        
Top AVERAGE memory consumption, by line:
(1)     1:    20 MB                                                                                                               
Top PEAK memory consumption, by line:
(1)     1:    20 MB           

Expected behavior
The program should run correctly. This is the output from Scalene 1.5.31.1:

$ scalene --version
Scalene version 1.5.31.1 (2023.09.15)
$ scalene scalene_check.py --outfile profile_1.5.31.1.txt 
done
$ cat profile_1.5.31.1.txt                               
                                    Memory usage: ▃▃▃▆▆██ (max: 30.427 MB, growth rate: 101%)                                    
                        /home/vscode/scalene_check.py: % of time = 100.00% (503.837ms) out of 503.837ms.                         
       ╷       ╷       ╷       ╷        ╷       ╷               ╷       ╷                                                        
       │Time   │–––––– │–––––– │Memory  │–––––– │–––––––––––    │Copy   │                                                        
  Line │Python │native │system │Python  │peak   │timeline/%     │(MB/s) │/home/vscode/scalene_check.py                           
╺━━━━━━┿━━━━━━━┿━━━━━━━┿━━━━━━━┿━━━━━━━━┿━━━━━━━┿━━━━━━━━━━━━━━━┿━━━━━━━┿━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╸
     1 │   39% │   58% │   3%  │  99%   │   30M │▃▆█ 100%       │  1156 │from qiskit import QuantumCircuit                       
     2 │       │       │       │        │       │               │       │                                                        
     3 │       │       │       │        │       │               │       │print("done")                                           
     4 │       │       │       │        │       │               │       │                                                        
       ╵       ╵       ╵       ╵        ╵       ╵               ╵       ╵                                                        
Top AVERAGE memory consumption, by line:
(1)     1:    30 MB                                                                                                               
Top PEAK memory consumption, by line:
(1)     1:    30 MB            

Desktop:

• OS: Linux 5.15.133.1-microsoft-standard-WSL2
• Python 3.10.13
• Scalene version 1.5.34 (2024.01.27) (from conda-forge)
• Qiskit version 0.45.2

Tested with the repository version as well.

[emeryberger]

Thanks for the report. I just issued a new release and your test works for me; it will take some time to get to conda-forge. That said, I saw that you tested with the repo version, and it did not work for you, which is surprising. Please give the new version a try and let's see what happens. Thanks.

[fpietra]

It now works correctly for me too with the current repo version (1.5.35 2024.02.23). Thanks.

[emeryberger]

Great. Closing; thanks again for the report!