t = open('check_buys')
lines = t.read()


f = open('check_buys')
line = f.read()

kk = (lines.rstrip('\n'))
z = (lines.rstrip('\n'))

print (kk in z)
if kk in z:
 = replace(kk,"MCD")
 print(z)

 with open('newlist.csv', 'w') as x:
  print(kk.replace(z,"MCD"),file=x)
  print(kk.replace(z,"MCD"))