hou.expandStringAtFrame function

Evaluates the given string expression at a certain frame and returns the result.

Global variables found in the expression are expanded, as well as any channel references. For example, hou.expandString('$F', 10) returns the string '10' while hou.expandString('ch("/obj/geo1/tx")', hou.frame()) returns the value of the translate X parameter for geo1 at the current time.

This function throws a hou.OperationFailed exception if the string that is passed in is None.