Re: [Tutor] How to access a method defined in one class from another class (which is a thread) in Python3?
On 09/08/13 16:50, SM wrote: Sorry I only just picked this up. (ex: self.tab_fw = QtGui.QWidget(), self.tab_ann = QtGui.QWidget(), etc), its own textEdit window and its own progress bar widget. All the tabs are defined within this single class - they are not instances of the class, as the tabs are distinct from each other. All of that is working really well. OK, I'll assume the structure looks like MainGUIWindow - Tab1 - TextEdit1 - ProgressBar1 - any other widgets on tab1 - Tab2 - TextEdit2 - ProgressBar2 - any other widgets on tab2 - Tab3 - TextEdit3 - ProgressBar3 - any other widgets on tab3 And that both the TextEdit and progress bar widgets are part of the Qt framework/library? So there are 3 distinct progress bar instances, one per tab? an added feature, I am now asked to have a "progress bar" widget which appears when an operation is going on, to tell the user that he/she has to wait. Is this an extra (4th?) progress bar or is this the ones already described as being in the tabs? Also, when you say "appears" do you mean its invisible until the operation starts? Or is it visible but inactive (maybe greyed out?) [SM]: Yes. I shouldn't say duplicated, but each tab has a different progress bar of its own. In the example, I was quoting the code for just on tab. The others will be implemented similarly. OK So I'm again going to assume: A total of 1 progress bar per tab. The "added feature" is what these bars are addressing? So I am running two threads - first one is the progressbar widget which has a rectangular slab spinning sideways to indicate that the operation is going on. I usually expect a progress bar to indicate the percentage complete but this sounds like its just a spinning eggshell activity indicator. Is that correct? You have no progress value indication? The second thread is the one which is actually doing the operation. > I have a flag that the second thread sets after the job is done OK, again I'll assume we are dealing with just an activity indicator not a value display. and stops spinning and gets out of the loop when the flag is set. I have that working as well. OK, Good the picture is building. [SM]: I did start out with a timer. But due to my lack of experience with usage of timer in Python, the code I wrote was running sequentially That sounds like you tried to use a Python native timer. Normally in a GUI the toolkit (Qt in this case) provides a timer event that triggers via the normal event mechanism. You set the timer, the event arrives and you do something then reset the timer for the next time round. I found this page that describes the Qt approach (which includes multi-shot timers) and links to more detailed examples etc. http://qt-project.org/doc/qt-4.7/timers.html#id-fd46b213-376e-4636-a7d2-8ae899de1e11 The code is in C++ but should translate easily to python and PyQt. HTH -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] How to access a method defined in one class from another class (which is a thread) in Python3?
On 11/08/13 17:05, Alan Gauld wrote: this sounds like its just a spinning eggshell erm, make that egg-timer... auto spell correction strikes again! -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] Python Arduino Web Page
I have written the following code in Python for my Arduino
#!c:\Python27\Python.exe
import cgi, cgitb;
import sys, serial
cgitb.enable()
ser = serial.Serial('COM27', 9600)
myvar = ser.readline()
print "Content-type:text/html\n\n"
print """
Real Time Temperature
window.onload = startInterval;
function startInterval()
{
setInterval("startTime();",1000);
}
function startTime(myvar)
{
document.getElementById('mine').innerHTML ="Temperature"
+parseInt(myvar);
}
Real Time Temperature:
"""
I have Apache Web Server
But on running this my localhost , I am getting the following output
"TemperatureNaN" . Why is NaN being showed. Why cant I get the number as
read by se.readline()?
Is there a way to separate the Python code and the Javascript on different
files. If so can you please give a example.?
I am not really interested to do with bottle or other web framework as I
will be controlling my arduino with python from the web and also do video
image processing with openCV. Open CV have a support for Python and not for
Javascript.
Thanks
Subhendu Sinha Chaudhuri
CLEANTECH SOLUTION
www.cleantechsolution.in
SAVE PAPER , SAVE EARTH
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[Tutor] Beginner question
I've been learning python from the website 'inventwithpython.com', and I'm on a
chapter that covers the following code:
import random
import time
def displayIntro():
print('You are in a land full of dragons. In front of you,')
print('you see two caves. In one cave, the dragon is friendly')
print('and will share his treasure with you. The other dragon')
print('is greedy and hungry, and will eat you on sight.')
print()
def chooseCave():
cave = ''
while cave != '1' and cave != '2':
print('Which cave will you go into? (1 or 2)')
cave = input()
return cave
def checkCave(chosenCave):
print('You approach the cave...')
time.sleep(2)
print('It is dark and spooky...')
time.sleep(2)
print('A large dragon jumps out in front of you! He opens his jaws and...')
print()
time.sleep(2)
friendlyCave = random.randint(1, 2)
if chosenCave == str(friendlyCave):
print('Gives you his treasure!')
else:
print('Gobbles you down in one bite!')
playAgain = 'yes'
while playAgain == 'yes' or playAgain == 'y':
displayIntro()
caveNumber = chooseCave()
checkCave(caveNumber)
print('Do you want to play again? (yes or no)')
playAgain = input()
I'm confused about what the line 'checkCave(caveNumber)' does and how it works.
I would appreciate any help with this
Thank you,
Eric
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[Tutor] Python and Web
Dear All
After a lot of struggling for weeks , I can read the serial port readings in
my web page. Below is the code
#!c:\Python27\Python.exe
import cgi, cgitb;
import sys, serial ,time
cgitb.enable()
ser = serial.Serial('COM27', 9600)
numOfLines = 0
print "Content-type:text/html\n\n"
print """
Real Time Temperature
Real Time Temperature:
"""
while True:
response = ser.readline()
print """
var int=self.setInterval(function(){refer()},1000);
function refer()
{
document.getElementById('mine').innerHTML ="""+response+""";
}
"""
ser.close()
sys.exit(0)
BUT is this good programming ? I personally do not feel so.
SECONDLY , during the whole execution process , the cursor is showing busy
and I am prevented to click anything else. Why is this so? How to avoid it.
CLEANTECH SOLUTION
www.cleantechsolution.in
SAVE PAPER , SAVE EARTH
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[Tutor] Python Programming for the absolute beginner 3e, Ch3 Challenge 4
Thanks for getting back to me...
I am using Python 3.3.2.
The challenge is as follows:
# Chapter 3 Challenge 4
#
# Write the psudocode for a program where the player and the computer
# trade places in the number guessing game. That is, the player picks a
# random number between 1 and 100 that the computer has to guess.
# Before you start, think about how you guess. If all goes well, try
# coding the game.
It builds on the previous challenge, where the user guesses the number - I
coded that OK, as below.
import random
print("\tWelcome to 'Guess My Number'!")
print("\nI'm thinking of a number between 1 and 100.")
print("Try to guess it in as few attempts as possible.\n")
# set the initial values
the_number = random.randint(1, 100)
guess = int(input("Take a guess: "))
tries = 1
# guessing loop
while guess != the_number and tries < 10:
if guess > the_number:
print("Lower...")
else:
print("Higher...")
guess = int(input("Take a guess: "))
tries += 1
if guess == the_number:
print("You guessed it! The number was", the_number)
print("And it only took you", tries, "tries!\n")
else:
print("Huh - you took ", tries, "tries and still never got it.")
print("It was ", the_number, " - but why tell you, you'll forget it,
won't you.")
input("\n\nPress the enter key to exit.")
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Re: [Tutor] Beginner question
On 10/08/13 04:30, eschneide...@comcast.net wrote:
I've been learning python from the website 'inventwithpython.com', and
I'm on a chapter that covers the following code:
import random
import time
def displayIntro():
print('You are in a land full of dragons. In front of you,')
print('you see two caves. In one cave, the dragon is friendly')
print('and will share his treasure with you. The other dragon')
print('is greedy and hungry, and will eat you on sight.')
print()
def chooseCave():
cave = ''
while cave != '1' and cave != '2':
print('Which cave will you go into? (1 or 2)')
cave = input()
return cave
def checkCave(chosenCave):
print('You approach the cave...')
time.sleep(2)
print('It is dark and spooky...')
time.sleep(2)
print('A large dragon jumps out in front of you! He opens his jaws
and...')
print()
time.sleep(2)
friendlyCave = random.randint(1, 2)
if chosenCave == str(friendlyCave):
print('Gives you his treasure!')
else:
print('Gobbles you down in one bite!')
playAgain = 'yes'
while playAgain == 'yes' or playAgain == 'y':
displayIntro()
caveNumber = chooseCave()
checkCave(caveNumber)
print('Do you want to play again? (yes or no)')
playAgain = input()
I'm confused about what the line 'checkCave(caveNumber)' does and how it
works. I would appreciate any help with this
It calls the checkCave function defined above. It passes in the cave
'number' as an argument. The function basically decides whether the
monster inside is friendly or not and prints an appropriate message.
It then returns control to the main while loop.
Does that help?
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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Re: [Tutor] dbus.Array to string
On 12/08/13 08:53, Amit Saha wrote:
Hello all,
The other day, I had to convert a dbus.Array [1] object to a string. I
found a way to do it, but I am not sure if that is the best way.
Does the Array object not have a "toString" method? Or similar?
What do you get when you call str() or repr() on the Array object?
Here is a dbus.Array object:
dbus.Array([dbus.Byte(66), dbus.Byte(105), dbus.Byte(103),
dbus.Byte(80), dbus.Byte(111), dbus.Byte(110), dbus.Byte(100),
dbus.Byte(54), dbus.Byte(55), dbus.Byte(57), dbus.Byte(68),
dbus.Byte(56), dbus.Byte(53)], signature=dbus.Signature('y'),
variant_level=1)
Basically it is an array of bytes, with a couple of extra arguments. Do you
care about the signature and variant_level arguments?
And this is how I converted it to it's string representation:
Careful. In usual Python terminology, the string representation of an object,
or just repr, is the string that represents how the object is created, more or
less. So the string representation would be something like:
"Array([Byte(66), Byte(105), ..., Byte(53)], signature=Signature('y'),
variant_level=1)"
which is nothing like what you want.
import dbus
ssid = "dbus.Array([dbus.Byte(66), dbus.Byte(105), dbus.Byte(103),
dbus.Byte(80), dbus.Byte(111), dbus.Byte(110), dbus.Byte(100), dbus.Byte(54),
dbus.Byte(55), dbus.Byte(57), dbus.Byte(68), dbus.Byte(56), dbus.Byte(53)],
signature=dbus.Signature('y'), variant_level=1)
"
Here you create a string, which looks like "dbus.Array(...)".
ssid = ''.join([chr(character) for character in ssid])
Since ssid is already a string, iterating over it gives you characters; calling
chr() on a character raises an exception.
ssid
'BigPond679D85'
Not with the code you provide.
If you drop the quotation marks around the dbus.Array, so you get an Array
object instead of a string, then your code may work. But look at your list
comprehension:
[chr(character) for character in ssid]
That's confusing. If iterating over ssid gives characters, as the code claims,
then there is no need to call chr(), and in fact you wouldn't need the list
comp at all, you could just say:
''.join(ssid)
But it isn't an array of characters, it is an array of bytes. So:
''.join([chr(byte) for byte in ssid])
is less misleading and confusing.
Another alternative:
''.join(map(chr, ssid))
is more terse, but may not be as readable to those who aren't familiar with
map. Both forms should be more or less equally as efficient.
--
Steven
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Re: [Tutor] dbus.Array to string
On 12/08/13 11:40, eryksun wrote:
On Sun, Aug 11, 2013 at 9:14 PM, Amit Saha wrote:
import dbus
ssid=dbus.Array([dbus.Byte(66), dbus.Byte(105), dbus.Byte(103),
dbus.Byte(80), dbus.Byte(111), dbus.Byte(110), dbus.Byte(100),
dbus.Byte(54), dbus.Byte(55), dbus.Byte(57), dbus.Byte(68),
dbus.Byte(56), dbus.Byte(53)], signature=dbus.Signature('y'),
variant_level=1)
temp_ssid = ''.join([chr(byte) for byte in ssid])
temp_ssid
'BigPond679D85'
Typically strings should be unicode. If the byte sequence is Latin-1
(including ASCII), you can map unichr() and join the characters with
u''.join(); that's equivalent to chr() and ''.join() in 3.x. More
generally, decode() the byte string. A simply way that works in 2.6+
is to create a bytearray:
>>> bytearray(ssid).decode('latin-1')
u'BigPond679D85'
Nice!
But, what makes you think that the encoding will be latin-1? If I had to guess
an encoding, I'd guess UTF-8.
--
Steven
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