Re: [Tutor] can I make a while loop true again
Hi It has taken me longer than I thought to get back to this topic. tut. Anyway thanks. I wondered why array was being mentioned ha ha So have I got this correct in that when I run a turtle program I am in fact using this forever loop, so I do not need to use a while True loop at all really in a turtle gui program? > To: tutor@python.org > From: __pete...@web.de > Date: Tue, 11 Feb 2014 14:01:47 +0100 > Subject: Re: [Tutor] can I make a while loop true again > > Ian D wrote: > >> Thanks for the help on the last one. >> >> Is it possible to restart a while loop? This doesn't work at all (surprise >> surprise) >> >> import turtle as t >> >> def start(): >> global more >> more = True >> >> def stop(): >> global more >> more = False >> >> more = True >> >> while True: >> while more: >> >> t.onkey(stop, "space") >> t.onkey(start, "Up") >> t.fd(1) >> t.listen() > > When you want your script to work like a typical GUI application you will > soon reach the limits with turtle. turtle tries hard to hide it, but GUIs > have an independent loop permanently running listening to user events and > small functions to respond these events. > > To have the turtle start and stop I came up with the following which looks > similar to normal GUI code. Instead of the explicit loop there is a function > `step_forward` that may or may not reschedule itself depending on the state > of the `running` flag. > > > > import turtle > > def step_forward(): > if running: > turtle.forward(5) > # call step_forward() again after 100 milliseconds: > turtle.ontimer(step_forward, 100) > > def start(): > global running > > if not running: > running = True > step_forward() > > def turn_left(): > turtle.left(10) > > def turn_right(): > turtle.right(10) > > def stop(): > global running > running = False > > running = False > > turtle.delay(0) > turtle.onkey(start, "Up") > turtle.onkey(turn_left, "Left") > turtle.onkey(turn_right, "Right") > turtle.onkey(stop, "space") > > turtle.listen() > turtle.mainloop() > > As a bonus the turtle changes its direction when you hit the left or right > array. > > ___ > Tutor maillist - Tutor@python.org > To unsubscribe or change subscription options: > https://mail.python.org/mailman/listinfo/tutor > ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Beginner - explaining 'Flip a coin' bug
On 2014-02-12, Steven D'Aprano wrote: > Of course attachments are "a thing" in Usenet. One of the > reasons so few ISPs offer News services these days is because > of the *huge* volume of attachments on binary news groups. Any > news client that can't at least *receive* attachments is a > major failure. I'm living in the past, man! -- Neil Cerutti ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Regular expressions
Hi,
On 13 February 2014 06:44, Santosh Kumar wrote:
> I am using ipython.
>
> 1 ) Defined a string.
>
> In [88]: print string
> foo foobar
>
> 2) compiled the string to grab the "foo" word.
>
> In [89]: reg = re.compile("foo",re.IGNORECASE)
>
> 3) Now i am trying to match .
>
> In [90]: match = reg.match(string)
>
> 4) Now i print it.
>
> In [93]: print match.group()
> foo
>
> Correct me if i am wrong, i am expecting both "foo" and "foobar", why is it
> giving
> just "foo"
A small addition to Peter's already comprehensive reply: Your regular
expression is not including what follows "foo", it is defined as
*only* the string literal "foo", so it can only ever match and return
the literal string "foo".
Try specifying "foo.*" as the regular expression. Example session:
Python 2.7.5 (default, May 15 2013, 22:43:36) [MSC v.1500 32 bit (Intel)]
Type "copyright", "credits" or "license" for more information.
IPython 1.0.0 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object', use 'object??' for extra details.
[C:/Src]|1> s='foo foobar'
[C:/Src]|2> import re
[C:/Src]|3> reg=re.compile('foo.*', re.IGNORECASE)
[C:/Src]|4> match=reg.match(s)
[C:/Src]|5> print match.group()
foo foobar
Walter
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