import json as j
 import _collections
 x=[('Victor','Microsoft',7),('David','Facebook','5'),('Stephen','Google',8)]
 tab_d=['Name','Company','Exp']
 db_data=[]
 db_single={}
 for i,data in enumerate(x):
     db_single[tab_d[0]] = data[0]
     db_single[tab_d[1]] = data[1]
     db_single[tab_d[2]] = data[2]
     db_data.append(db_single)
 j=j.dumps(db_data)
 file = open('firstjson.js', 'w')
 file.write(j)

...
 for i,data in enumerate(x):
     db_single={}
     db_single[tab_d[0]] = data[0]
 ...