Dan Baker <dbaker3448@gmail.com> writes:
It seems odd that "for x in y if z" is allowed in comprehensions but not in a regular for loop. Why not let
for x in y if z: do_stuff(x)
be a shorthand for
for x in y: if not z: continue do_stuff(x)
This can already be spelled: for x in (w for w in y if z): do_stuff(x) Which is not to forestall discussion of the proposed language change, but only to point out that there is an existing idiom for this.
Similarly, I occasionally have multiple sections that need to be handled differently. One way to write this is: for line in input_file: if is_section_delimiter(line): break do_stuff_1(line) for line in input_file: # this picks up where the last one left off if is_section_delimiter(line): break do_stuff_2(line) etc.
That looks like it would be better modelled with an explicit state transition when the condition is encountered, without stopping the iteration: handlers = [do_stuff_1, do_stuff_2, do_stuff_3] handle_line = handlers.pop(0) for line in input_file: if is_section_delimiter(line): handle_line = handlers.pop(0) handle_line(line) -- \ “Philosophy is questions that may never be answered. Religion | `\ is answers that may never be questioned.” —anonymous | _o__) | Ben Finney