how to use os module in gin file

[sWenzhuo]

I want to use module to connect url.
#inside data.gin
import os
DataPatient="path1"
Data_no_smooth= os.path.join("/orgindata",os.path.basename(%DataPatient))
Data_smooth= os.path.join("/smoothdata",os.path.basename(%DataPatient))

I doesn't work.I want to know how to use python method in gin file

[sWenzhuo]

readdata_v3.inter_time=60*%DataInter
readdata_v3.pre_time=30*%DataPre

60*%DataInter error