Mic wrote:
I want a function to run every second , how do I do that?
Say that the function look like this:
def hi():
print("hi")
For a script that uses tkinter there's the after() method.
Example:
root = Tk()
def hi():
>print("ho")
def hi_reschedule():
> hi()
># make tkinter call it again after 1000 milliseconds
>root.after(1000, hi_reschedule)
hi_reschedule() # call it manually the first time
http://infohost.nmt.edu/tcc/help/pubs/tkinter/universal.html
Nice!
Thank you!
------------------------------
Message: 3
Date: Tue, 29 Nov 2011 10:33:41 -0500
From: Dave Angel <d...@davea.name>
To: bod...@googlemail.com
Cc: Tutor - python List <tutor@python.org>, Mic <o0m...@hotmail.se>
Subject: Re: [Tutor] Making a function run every second.
Message-ID: <4ed4fb55.1000...@davea.name>
Content-Type: text/plain; charset=windows-1252; format=flowed
(You put your response in the wrong place; it belongs after the part
you're quoting.)
he
On 11/29/2011 10:19 AM, bod...@googlemail.com wrote:
You won't get it exactly on because the time it takes to call the function
will affect your trigger time.
I would use something like an infinite loop with a 1 second sleep after
the function call
Bodsda
Sent from my BlackBerry? wireless device
-----Original Message-----
From: "Mic"<o0m...@hotmail.se>
Sender: tutor-bounces+bodsda=googlemail....@python.org
Date: Tue, 29 Nov 2011 15:54:59
To:<tutor@python.org>
Subject: [Tutor] Making a function run every second.
Hi
I want a function to run every second , how do I do that?
Say that the function look like this:
def hi():
print("hi")
Thanks!
Mic
Without a clearer spec, there are too many possible answers. As Bobsda
says, you can't get it exactly one second apart. But you also have the
problem of whether a drift is okay. For example, if you have a global
you're incrementing each time that function runs, and you want it to
represent the total time the program has been running, then a simple
sleep() is totally wrong.
What I was concerned about is that perhaps this is for one of the
tkinter programs Mic is writing. For an event-driven program, sleep()
calls of even a second are unaccepable. And if you literally write a
while loop like that, your whole program would stop responding.
So Mik:
Tell us more about the real requirements. Is drift acceptable, is this
a console program or some gui environment, are there any other hidden
assumptions?
--
DaveA
------------------------------
Message: 4
Date: Tue, 29 Nov 2011 16:35:22 +0100
From: "Mic" <o0m...@hotmail.se>
To: <d...@davea.name>
Cc: tutor@python.org
Subject: Re: [Tutor] How to handle try and except in this case
Message-ID: <col124-ds245e361a018ae1aab47abeb7...@phx.gbl>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
-----Ursprungligt meddelande-----
From: Dave Angel
Sent: Tuesday, November 29, 2011 4:25 PM
To: Mic
Cc: tutor@python.org
Subject: Re: [Tutor] How to handle try and except in this case
(You top-posted again. Try to put your remarks AFTER the part you're
quoting, so that the message is self-descriptive)
I did? I thought I posted this:
"""
Could you explain what's unclear about it? Andreas couldn't get more
specific, since you didn't say how these 10 names are provided.
Yes, it was probably my fault. Sorry about that. I have come up with a new
way of working around
a problem in my main program so I only need two files to be tested if they
exist instead of say 10 files. """
Is that top posting?
The os.path.exists(filename) returns a boolean, and doesn't tie up
resources, so you are welcome to use it in an if expression.
if not (os.path.exists(file1) and os.path.exists(file2)):
>print "hi"
Thank you! What do you mean with that it "doesn't tie up resources"?
Mic
------------------------------
Message: 5
Date: Mon, 28 Nov 2011 09:47:06 -0500
From: Max gmail <maxskywalk...@gmail.com>
To: surya k <sur...@live.com>
Cc: Python Tutor <tutor@python.org>
Subject: Re: [Tutor] why doesn't python show error
Message-ID: <b88e173d-d050-4647-9413-c9f7e54ce...@gmail.com>
Content-Type: text/plain; charset=iso-8859-1
In some cases, it is a useful fact that Python only shows error messages
when they are encountered. For example, I can test a program while keeping
away from an area that still doesn't work, rather than having to make it
work flawlessly before my first test.
Python *can* generate executables with py2exe, though if you use Python 3
you'll need to learn to convert your code to Python 2. Or, as Blender does,
you could include Python in the download of your program, so that the user
installs both your program and Python.
On Nov 28, 2011, at 4:53 AM, surya k wrote:
1. Why doesn't python show error(description given below) at the beginning
when we use functions which aren't present in the standard modules...
Example:
TheString = raw_input('enter a string')lengthofStr = strlen(TheString)Look
closely, I used a wrong function to find length of the string. [ strlen( )
belongs to C ].When I run the program, it didn't show any error but when
entered input, it then showed up!.Why python doesn't show error at the
beginning just like C does?2. Why doesn't python create executable file
(.exe ) when we run the code.. If this doesn't do, how can I share my
program.. does everyone need to have python to check others code and know
what it does?
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------------------------------
Message: 6
Date: Tue, 29 Nov 2011 10:48:00 -0500
From: Dave Angel <d...@davea.name>
To: Mic <o0m...@hotmail.se>
Cc: tutor@python.org
Subject: Re: [Tutor] How to handle try and except in this case
Message-ID: <4ed4feb0.60...@davea.name>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 11/29/2011 10:35 AM, Mic wrote:
-----Ursprungligt meddelande----- From: Dave Angel Sent: Tuesday,
November 29, 2011 4:25 PM To: Mic Cc: tutor@python.org Subject: Re:
[Tutor] How to handle try and except in this case
(You top-posted again. Try to put your remarks AFTER the part you're
quoting, so that the message is self-descriptive)
<SNIP - a perfectly reasonable message>
Is that top posting?
No, you're absolutely right. I don't know what I was looking at. Maybe
I had your message scrolled when I was reading it. I am sorry.
The os.path.exists(filename) returns a boolean, and doesn't tie up
resources, so you are welcome to use it in an if expression.
if not (os.path.exists(file1) and os.path.exists(file2)):
>print "hi"
Thank you! What do you mean with that it "doesn't tie up resources"?
If you do multiple opens in the same expression, you can't easily*
capture all the file objects, especially in the case of an exception.
So there may be files left open that will get closed an indeterminate
amount of time in the future. That sort of thing is probably acceptable
if the program is short-lived, but even then you can run into
file-sharing conflicts. Note that current CPython versions are pretty
good about closing files if you don't save the object, but other
versions might not get around to it for a while.
Mic
* (you can partially solve this if you put the open inside a list
comprehension or equivalent, but exceptions still rear their ugly heads)
--
DaveA
------------------------------
Message: 7
Date: Tue, 29 Nov 2011 16:52:47 +0100
From: "Mic" <o0m...@hotmail.se>
To: <d...@davea.name>, <bod...@googlemail.com>
Cc: Tutor - python List <tutor@python.org>
Subject: Re: [Tutor] Making a function run every second.
Message-ID: <col124-ds25eef909cc9c089bfe0401b7...@phx.gbl>
Content-Type: text/plain; format=flowed; charset="Windows-1252";
reply-type=response
-----Ursprungligt meddelande-----
From: Dave Angel
Sent: Tuesday, November 29, 2011 4:33 PM
To: bod...@googlemail.com
Cc: Mic ; Tutor - python List
Subject: Re: [Tutor] Making a function run every second.
(You put your response in the wrong place; it belongs after the part
you're quoting.)
Okay, thanks.
On 11/29/2011 10:19 AM, bod...@googlemail.com wrote:
You won't get it exactly on because the time it takes to call the
function will affect your trigger time.
I would use something like an infinite loop with a 1 second sleep after
the function call
Bodsda
Sent from my BlackBerry? wireless device
-----Original Message-----
From: "Mic"<o0m...@hotmail.se>
Sender: tutor-bounces+bodsda=googlemail....@python.org
Date: Tue, 29 Nov 2011 15:54:59
To:<tutor@python.org>
Subject: [Tutor] Making a function run every second.
Hi
I want a function to run every second , how do I do that?
Say that the function look like this:
def hi():
print("hi")
Without a clearer spec, there are too many possible answers. As Bobsda
says, you can't get it exactly one second apart. But you also have the
problem of whether a drift is okay. For example, if you have a global
you're incrementing each time that function runs, and you want it to
represent the total time the program has been running, then a simple
sleep() is totally wrong.
Okay, I undestand. Hmm, what is a drift?
What I was concerned about is that perhaps this is for one of the tkinter
programs Mic is writing. For an event-driven program, sleep() calls of
even a second are unaccepable. And if you literally write a while loop
like that, your whole program would stop responding.
Yes, this is one of my tkinter programs :) Why would the program stop
responding using a sleep()?
So Mik:
Tell us more about the real requirements. Is drift acceptable, is this a
console program or some gui environment, are there any other hidden
assumptions?
Okay, this function approximately runs every second and check what the time
is.
(Well, every 30 second or every minute would be okay if that makes it
easier)
If the time is 15:00 it is supposed to remove a file. That should be all
requirements!
I have figured out how to make the function check what time it is and how to
remove the file when the time is 15:00, but I don't know how to make it run
every
second or something like that.
Thanks!
Mic
------------------------------
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