When coding in PyQt (or PySide), should I use Python functions or the equivalent Qt functions?
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When writing code using PyQt or PySide, sometimes the equivalent function is available in both Qt and Python (e.g., `QDir.exists` in Qt vs `os.path.exists` in Python). In these cases, is there an established practice for which language to use?

I am wondering if issues of speed, refactoring, etc. might be relevant to the decision.

Thanks.