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Python expression for string parameters evaluation

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Just to explore the Python API, I'm trying to rewrite built-in shelf tools' Hscript parameters in Python. To my surprise, changing

`opinputpath("../../transform1", 0)`




actually works. I wonder why Python expression doesn't need to be surrounded in backticks(`)? How does Houdini know I'm typing in a Python expression instead of a string?

And more importantly, what if I really want



to be treated as a string instead of an expression?

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