[Tutor] IDLE question

[Dick Moores]

I'm trying to enter

 >>>if D.has_key("b"):
	   print "yes"
        else:
              print "no"

in IDLE v1.0.3. by typing it in, line by line. lines 1 and 2 go OK, but 
hitting "Enter" after "yes" causes the cursor to move to just under the 
"p" of "print", as expected. If I use the Backspace key and the space bar 
to line up and indent "else:" correctly, hitting Enter after that causes 
the error, "IndentationError: unindent does not match any outer 
indentation level (<pyshell#10>, line 3)". Is there no way to get this 
entered other than typing the 4 lines in a text editor and pasting them 
all together into IDLE?

This is not an idle question. It's really been bugging me. ;-)

Thanks,

Dick Moores