[Tutor] Problem with "elif"

[alan.gauld@bt.com]

> >>> y = 1900
> >>> leap = "no"
> >>> if y % 400 == 0 :
>         leap = "yes"
>     elif y % 100 == 0 :
>             
> IndentationError: unindent does not match any outer 
> indentation level (line 3)

This looks like you are using IDLE - coz there are no ... prompts.

In that case  you should NOT have indented the elif - even tho it looks OK.

This is coz IDLE sees the initial 'if' as being at the beginning of the
line, so the elif must be too.

Personally I always feel this is a bug in the IDLE Shell, it should
line up visually, but sadly it doesn't. (At least in V0.6)

See my session below:
>>> y = 1900
>>> leap = 'no'
>>> if y % 400 == 0:
	leap = 'y'
elif y % 100 == 0:
	leap = 'n'

	
>>> leap
'n'
>>> y = 2000
>>> if y % 400 == 0:
	leap = 'y'
elif y % 100 == 0:
	leap = 'n'

	
>>> leap
'y'

Yes, I agree, this is a very confusing foible of IDLE.

Alan g.