for / while else doesn't make sense

[Lawrence D’Oliveiro]

On Sunday, June 5, 2016 at 11:43:20 PM UTC+12, Marko Rauhamaa wrote:
> I often experiment with different loop constructs to find the one most
> pleasing to the eye. Working directly off iterators is quite rare but a
> while-vs-for consideration is frequent. Also, should the stepping part
> be in the beginning, middle or end of the loop body?

It is nice to have a common, versatile looping form which can be arranged in different ways to suit the problem at hand. That’s why I like the C-style for-statement.

Here’s another example <https://github.com/ldo/ipy_magics/blob/master/rman_magic.py>, for the consideration of those who don’t seem too familiar with looping:

    while True :
        while True :
            line = next(input_line, None)
            if line != None :
                if len(include_stack) == 0 :
                    linenr += 1
                #end if
                break
            #end if
            if len(include_stack) == 0 :
                break
            input_line = include_stack.pop()
        #end while
        if line == None or ... line contains something special ... :
            ...
            if line == None :
                break
            ... process special line ...
            ... replace with None to indicate it’s been processed ...
        #end if
        if line != None :
            ... process regular line ...
        #end if
    #end while