[Jah-yee]

Summary

Fixes OSError raised in __del__ when no PicoScope device is connected.

Problem: When instantiating ps2000.PS2000() with no device connected, ps2000_open_unit() returns 0. This sets self.handle = 0. In close(), the check if self.handle is not None: evaluates to True (since 0 is not None), so it calls _lowLevelCloseUnit(0) → returns 0 → checkResult(0) → raises OSError in __del__.

Fix: Change if self.handle is not None: to if self.handle: in picobase.py. This treats both None and 0 (and any falsy value) as "not a valid connection", skipping the close call.

Testing

• Syntax check: python3 -m py_compile picoscope/picobase.py ✅
• The fix is minimal and localized — it only affects the close guard, no behavior change for valid handles.

Fixes #214

[Jah-yee]

Friendly ping — any updates? Happy to address feedback.

[hmaarrfk]

thx see latest version