IndentationError: expected an indented block

[python1980]

I have a list e2f, (english to french), i am trying to create a new directory f2e, i am getting
IndentationError: expected an indented block, i used space, tab but not working

how do i resolve it ? also, is : necessary after the for loop syntax

e2f ={'dog':'chien','cat':'chat','walrus':'morse'}

>>> for e,f in e2f(items):
... f2e(f)=e
  File "<stdin>", line 2
    f2e(f)=e
      ^
IndentationError: expected an indented block