cleaning/parsing JSON with python : Can anyone help to clean below JSON

"1-Transaction Transfer Info Segment-F2":{"Selling Store Number":"01818","Transaction Date":"2014-09-08","Transaction Time":"05:45:49","Transaction Service Type":"I","IP Time Id":"118180546186"}

I want  to clean this json as below

1-Transaction Transfer Info Segment-F2 =>1_Transaction_Transfer_Info_Segment_F2
Selling Store Number => Selling_Store_Number,Transaction Service Type => Transaction_Servic_Type,IP Time Id => IP_Time_Id