Having difficulty getting a int data from powerflow file

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Dear fellow researchers,

I've been writing a code to search through a list of bus numbers and see if there are any fixed shunts in the list.

While I was working on it, it seems like psspy.fxsint function is not working well.

ierr,ival = psspy.fxsint(busnum)

ierr,ival = psspy.fxsint(busnum,'1')

Whenevery I try this one, it only returns (2,None) when I already know there are fixed shunts in the list!

Have you guys ever used this function?

Thank you.