import os

sourceFile = open("source.csv","r")
text = sourceFile.read()
sourceFile.close()
sourcelines = text.splitlines(0)

diffFile = open("notinoff.txt","r")
text = diffFile.read()
diffFile.close()
difflines = text.splitlines(0)

for i in difflines:    
   if i in sourcelines:
       sourcelines.remove(i)



endFile=open("dest.csv","a")

for i in sourcelines:
    print >>endFile, i
#endFile.writelines(sourcelines)
    
endFile.close()