Posts by bumsfeld

The program takes text and establishes dictionary of character:frequency. This dictionary is then presented sorted by character. Since it is important to show the most frequent characters, two methods are given to present dictionary sorted by frequency. Should all be very good for learning Python.

Do you think that people act demented during full moon nights? This small python program will tell you moon phase of a date you give it, so you can take precautions!

Question of wordcount program similar to Unix wc came up in the forum and I worked on a solution. Program shows number of lines, number of words, number of characters and text file's name. Good learning for commandline, file and string handling.

Muchly great code man!

The little program allows eye patients to test their color skills. They are given a random color rectangle by the computer and are then asked to match the color as closely as they can using sliders of the three basic colors. An evaluation button examines the closeness of the results.

Pythagoras is the man's real name.

I would be temded to bring the story in from a text file, but than of course you need to distrubute two files.

&& stands for the C and = &

Here is a list of macros I have been using.

I always wondered how qsort was correctly implimented.

Vegaseat, to keep primes from going over n, replace line
s = range(3, n+2, 2)
with
s = range(3, n+1, 2)

Henri

This program use a while loop to delete trailing spaces and tabs from a string. It is meant to be more of an example of the application of the while loop.

Commonly strings consist of ASCII characters, some are printable, some are in the backgrounds like the bell, carriage return, linefeed, tab and so forth. This code displays a table of ASCII characters and the corresponding decimal value. As always, you are encouraged to learn here.

A simple program to show you how to create a table of Fahrenheit and Celsius values using a for loop. You may be able to learn from this code.

Just a colorful ten second countdown to New Year. Hope you can learn some code from it.

My first experience with pointers. Learned how to spell a string foreward and backward using pointers. I hope you can learn too!

I do not know anything of BCX, but you make it read interesting.

I do not know Python much, but I was taught that you start with Adam and Eve, not one trillion old people!

Interesting code. Corrected a few errors, now it works. However fact(14) is less then fact(13).

Wow, this difficult to read! Why are there so many "you must" in there?

The last time I has seen such odd header files, was in one of Herb Schildt's old books.

Twice is better? You must be shiddin us!

I thought VB was hard to read, this almost impossible!

What compiler is that? Can't find dos.h anywhere!

David, you know how to explane things good!

These looks very much like the code VegaSeat wrote earlier?

Right from the example code! Come on, you can do better!

Mr. Omen,

your code samples a plane riboff from the examples that come with the download. Can't you apply a little imagination?

You made Python sound very interestung to me!

Dave, you are correct here, there is difference between representation and conversion.

I think FunsterStil is Danish for WindowStyle.

Wow, dude your code makes it very clear!

I like simpel stuff!

Even my professor of mathematics couldn't believe this easy algorithm.

Caluculator is cute!

Extension .pyd is used for C compiled library files for Python.

What is more efficient?

1) import math
2) from math import *
3) from math import sin, cos

It's like putting single image on PyGame "liquid canvas" giving an eerie visual effect. Here is short code:

# PyGame liquid effect on single image
# just old PyGame example modified
# module pygame free from: http://www.pygame.org

import pygame as pg
import math

pg.init()
# set width and height of pygame window
w = 600
h = 400
screen = pg.display.set_mode((w, h), pg.HWSURFACE|pg.DOUBLEBUF)
pg.display.set_caption('Animation of single image')

# load image file you have
# if not in the working folder, add full path
image_file = 'PythonHand3.jpg'
bitmap = pg.image.load(image_file)
# double the image size
#bitmap = pg.transform.scale2x(bitmap)

# put image and screen into the same format
if screen.get_bitsize() == 8:
    screen.set_palette(bitmap.get_palette())
else:
    bitmap = bitmap.convert()

increment = 0.0
x_list = range(0, w, 10)
y_list = range(0, h, 10)
while True:
    for event in pg.event.get():
        if event.type == pg.QUIT:
            raise SystemExit
    increment += 0.08
    for x in x_list:
        xpos = (x + (math.sin(increment + x*0.01)*15)) + 20
        for y in y_list:
            ypos = (y + (math.sin(increment + y*0.01)*15)) + 20
            screen.blit(bitmap, (x, y), (xpos, ypos, 20, 20))
    pg.display.flip()

If you are familiar with C++, Java would be the way to go. Python is simply too uncomplicated.

please help me to choose best progranmming language between
java, python, php, c#,...
that cover above features

Since you are already used to C++ I would say use Java.

Is there a way to use a similar method with images instead of pixels? I know about all of that, but I need to load multiple images into PIL and tile them in a square...

Is it possible?

Looks like Sneekula wasted his time on you then.
I assume you also know all about img.getdata(), then you can put it together with img.putpixel().

niek_e is correct, successful compression depends on the source and the compression algorithm. Here is one example of large repeating text that the zip algorithm fails with, but bz2 compression works great:

# exploring Python file compression/decompression module bz2
# .bz2 files can be decompressed with WinRAR utility
# uncompressed file 'longtext.txt' has size of 48 kbytes
# level9 compressed 'longtext.bz2' has size of 1 kbyte
# zip compressed file 'longtext.zip' is of size 95 kbytes!
# tested with Python 3.1

import bz2

text = "use this to make one very long string right now\n"
# create 1000 lines of repeating text
text = text*1000

# create uncompressed text file
uc_fname = 'longtext.txt'
fout = open(uc_fname, 'w')
fout.write(text)
fout.close()

# create bz2 compressed file (can be used with WinRAR)
bz2_fname = 'longtext.bz2'
bzout = bz2.BZ2File(bz2_fname, 'w', compresslevel=9)
# Python3 requires text string to be encoded to bytearray
bzout.write(text.encode('utf8'))
bzout.close()

# read bz2 compressed file
bz2_fname = 'longtext.bz2'
bzin = bz2.BZ2File(bz2_fname, 'r', compresslevel=9)
# result of read() is of type string
text2 = bzin.read()
bzin.close()

# short test ...
print("Length of original text = %d" % len(text))
print("Length of recovered text = %d" % len(text2))

# the other way to compress ...
# create zipfile compressed file
# in this case the compressed file is larger than the original!
import zipfile as zf
z_fname = 'longtext.zip'
zout = zf.ZipFile(z_fname, 'w', compression=zf.ZIP_DEFLATED)
zout.write(uc_fname, text)
zout.close()

Is the RAM used as the buffer?

I would say yes, unless your Operating System uses disk space as virtual memory.

One rude awakening with Python3 will be the frequent use of bytearrays instead of strings. It does this to handle international unicode better.

Here is how you deal with this:

# get code of given URL as html text string
# Python3 uses urllib.request.urlopen()
# instead of Python2's urllib.urlopen() or urllib2.urlopen()

import urllib.request

fp = urllib.request.urlopen("http://www.python.org")

mybytes = fp.read()
# note that Python3 does not read the html code as string
# but as html code bytearray, convert to string with
mystr = mybytes.decode("utf8")

fp.close()

print(mystr)

Also the online book "dive into python" has been mostly
rewritten for Python3 (check appendix A for 2to3 diffs):
http://diveintopython3.org/

Swaroop C.H. has rewritten his excellent beginning Python tutorial for Python3:
http://www.swaroopch.com/notes/Python_en:Table_of_Contents

There is example at:
http://www.daniweb.com/forums/showpost.php?p=947978&postcount=46
that might work.

Retrieve the text from Tkinter Text widget line by line:

# explore the Tkinter Text() widget
# getting text 'line by line' from the widget
# use ctrl+c to copy, ctrl+x to cut selected text,
# ctrl+v to paste, and ctrl+/ to select all
# Henri

try:
    # for Python2
    import Tkinter as tk
except ImportError:
    # for Python3
    import tkinter as tk

def get_text(event):
    """get text widget contents of given line n (firstline=1)"""
    # retrieve the line number from button text
    n = int(event.widget.cget("text"))
    # set up start and end of the line
    start = "%d.0" % n
    end = "%d.end" % n
    # get the line text
    s = text.get(start, end)
    # show it in the label
    label['text'] = s

# test data
mw = """\
Na Sodium 22.98977
Mg Magnesium 24.305
Al Aluminum 26.98154
Si Silicon 28.0855
P Phosphorus 30.97376
S Sulfur 32.066
Cl Chlorine 35.4527
Ar Argon 39.948"""

root = tk.Tk()
root.title('get text line by line')

# text field, width=width chars, height=lines text
text = tk.Text(root, width=30, height=8, bg='yellow')
text.insert('insert', mw)
text.pack(pady=5)

# create buttons to call each line by number
for n, data in enumerate(mw.split('\n')):
    # first line in text is 1
    s = str(n+1)
    btn = tk.Button(root, text=s)
    btn.bind("<Button-1>", get_text)
    btn.pack(side='left', pady=5, padx=2)

# width/height in char size
label = tk.Label(root, text="", width=30, height=2)
label.pack(side='top', pady=5)

root.mainloop()

In the previous example I meant 'Tkinter' rather than 'Tinter'. This however is PyQT example looking at the tooltip widget and some colored text:

# pqt_tooltip1.py
# exploring PyQT's tooltip and color text (html)
# Henri

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class Tooltip(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)
        # setGeometry(x_pos, y_pos, width, height)
        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('Tooltip')

        btn_hello = QPushButton("Push Button")
        btn_hello.setToolTip('Press <b>me</b> for the greeting')
        self.connect(btn_hello, SIGNAL("clicked()"), self.on_click)

        self.label = QLabel()

        grid = QGridLayout()
        grid.addWidget(btn_hello, 0, 0, 1, 1)
        grid.addWidget(self.label, 1, 0, 1, 3)
        self.setLayout(grid)


    def on_click(self):
        s = "<font size=6 color='red'>Hello stranger!</font>"
        self.label.setText(s)


app = QApplication(sys.argv)
tooltip = Tooltip()
tooltip.show()
app.exec_()

What happens if you run this test code:

#!/usr/bin/env python

# example frame.py
# http://www.pygtk.org/pygtk2tutorial/sec-Frames.html

import pygtk
pygtk.require('2.0')
import gtk

class FrameExample:
    def __init__(self):
        # create new window
        window = gtk.Window(gtk.WINDOW_TOPLEVEL)
        window.set_title("Frame Example")

        # connect "destroy" event to signal handler
        window.connect("destroy", lambda w: gtk.main_quit())
        window.set_size_request(300, 300)

        # set border width of window
        window.set_border_width(10)

        # create the Frame
        frame = gtk.Frame()
        window.add(frame)

        # set the frame's label
        frame.set_label("GTK Frame Widget")

        # align the label at the right of the frame
        frame.set_label_align(1.0, 0.0)

        # set the style of the frame
        frame.set_shadow_type(gtk.SHADOW_ETCHED_OUT)
        frame.show()
  
        # display the window
        window.show()

def main():
    # enter the event loop
    gtk.main()
    return 0

if __name__ == "__main__":
    FrameExample()
    main()

Do you get error message?

What is your Operating System?
Which version of Python?
Which version of PyGTK?
On Windows PyGTK is almost impossible to install!