Shallow Thoughts : tags : python

isgd

% stty size
32 80

fcntl.ioctl(fd, termios.TIOCSWINSZ,
            struct.pack("HHHH", rows, cols, 0, 0))

import sys
import apt

cache = apt.cache.Cache()

pat = sys.argv[1]

for pkgname in cache.keys():
    if pat in pkgname:
        pkg = cache[pkgname]
        instver = pkg.installed
        if instver:
            print pkg.name, instver.version

STN--- WBAN   YEARMODA    TEMP       DEWP      SLP        STP       VISIB      WDSP     MXSPD   GUST    MAX     MIN   PRCP   SNDP   FRSHTT
724945 23293  20120101    49.5 24    38.8 24  1021.1 24  1019.5 24    9.9 24    1.5 24    4.1  999.9    68.0    37.0   0.00G 999.9  000000

>>> import keyword
>>> keyword.kwlist
['and', 'as', 'assert', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'exec', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'not', 'or', 'pass', 'print', 'raise', 'return', 'try', 'while', 'with', 'yield']

>>> set([1, 2, 3, 2, 2, 4, 5, 1, 5])
set([1, 2, 3, 4, 5])

>>> [ x for x in 'hello' ]
['h', 'e', 'l', 'l', 'o']

>>> [[c for c in w] for w in keyword.kwlist]
[['a', 'n', 'd'], ['a', 's'], ['a', 's', 's', 'e', 'r', 't'], ... ]

[item for sublist in [[c for c in w] for w in keyword.kwlist] for item in sublist]

reduce(lambda x,y: x+y, [[c for c in w] for w in keyword.kwlist])

import itertools
list(itertools.chain.from_iterable([[c for c in w] for w in keyword.kwlist]))

sum([[c for c in w] for w in keyword.kwlist], [])

>>> set('bubble')
set(['e', 'b', 'u', 'l'])

>>> set(''.join(keyword.kwlist))
set(['a', 'c', 'b', 'e', 'd', 'g', 'f', 'i', 'h', 'k', 'm', 'l', 'o', 'n', 'p', 's', 'r', 'u', 't', 'w', 'y', 'x'])

>>> string.lowercase
'abcdefghijklmnopqrstuvwxyz'

>>> [chr(i) for i in range(ord('a'), ord('z')+1)]
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

>>> set(string.lowercase[:]) - set(''.join(keyword.kwlist))
set(['q', 'j', 'z', 'v'])

sudo apt-get install ipython python-opencv python-scipy python-numpy python-pygame python-setuptools python-pip

sudo pip install https://github.com/ingenuitas/SimpleCV/zipball/master

wget https://github.com/ingenuitas/SimpleCV/master

pip install http:///home/pi/master --download-cache /home/pi/tmp

img = Image('lenna')
img.show()
img.binarize().show()
img.toGray().show()
img.edges().show()
img.invert().show()

img.listHaarFeatures()
img.findHaarFeatures('eye.xml').draw(color=Color.YELLOW)

#define QIK_GET_FIRMWARE_VERSION         0x81
#define QIK_GET_ERROR_BYTE               0x82
#define QIK_GET_CONFIGURATION_PARAMETER  0x83
[ ... ]
#define QIK_CONFIG_DEVICE_ID                        0
#define QIK_CONFIG_PWM_PARAMETER                    1

    QIK_GET_FIRMWARE_VERSION = 0x81
    QIK_GET_ERROR_BYTE = 0x82
    QIK_GET_CONFIGURATION_PARAMETER = 0x83
[ ... ]
    QIK_CONFIG_DEVICE_ID = 0
    QIK_CONFIG_PWM_PARAMETER = 1

>>> sun = ephem.Sun()
>>> la = ephem.city('Los Angeles')
>>> sf = ephem.city('San Francisco')
>>> 
>>> mid = ephem.Date('2012/10/31 8:00')
>>> 
>>> la.next_rising(sun, start=mid)
2012/10/31 14:11:57
>>> la.next_setting(sun, start=mid)
2012/11/1 01:00:45
>>> la.next_setting(sun, start=mid) - la.next_rising(sun, start=mid)
0.45055988136300584
>>> 
>>> sf.next_rising(sun, start=mid)
2012/10/31 14:34:19
>>> sf.next_setting(sun, start=mid)
2012/11/1 01:11:44
>>> sf.next_setting(sun, start=mid) - sf.next_rising(sun, start=mid)
0.4426457611261867

>>> (la.next_setting(sun, start=mid) - la.next_rising(sun, start=mid)) - (sf.next_setting(sun, start=mid) - sf.next_rising(sun, start=mid))
0.007914120236819144
>>> ((la.next_setting(sun, start=mid) - la.next_rising(sun, start=mid)) - (sf.next_setting(sun, start=mid) - sf.next_rising(sun, start=mid))) * 24
0.18993888568365946
>>> ((la.next_setting(sun, start=mid) - la.next_rising(sun, start=mid)) - (sf.next_setting(sun, start=mid) - sf.next_rising(sun, start=mid))) * 24 * 60
11.396333141019568

    if self.current :
        if self.current.poll() == None :
            # Current process hasn't finished yet. Is this the same sound?
            if path == self.curpath :
                # A repeat of the currently playing sound.
                # Don't play it more than once.
                return
            else :
                # Trying to play a different sound.
                # Wait on the current sound then play the new one.
                self.wait()

    self.curpath = path
    self.current = subprocess.Popen([ "/usr/bin/aplay", '-q', path ] )

    def __del__(self) :
        self.wait()

img = gimp_image_list()[0]
img.parasite_list()
img.parasite_find(img.parasite_list()[0])

    pdb.gimp_file_save(img, drawable, img.filename, img.filename)
    pdb.gimp_image_clean_all(img)

    counts = collections.Counter()
    for img in gimp.image_list() :
        if img.filename :
            counts[os.path.dirname(img.filename)] += 1
    try :
        return counts.most_common(1)[0][0]
    except :
        return None

<dc:subject>Science fiction</dc:subject>

ozf.writestr(info, dom.toprettyxml().encode(encoding, 'xmlcharrefreplace'))

writestr(info, dom.toprettyxml(encoding=encoding)

apt-get install python-stdeb fakeroot python-all

[DEFAULT]
Suite: precise

python setup.py --command-packages=stdeb.command bdist_deb

python setup.py --command-packages=stdeb.command sdist_dsc

dpkg-buildpackage: binary only upload (no source included)

import ephem

venus = ephem.Venus()

print '%10s   %6s %6s %6s %6s' % ('date', '%', 'mag', 'dist', 'size')
def print_venus(when) :
    venus.compute(when)
    fmt = '%02d-%02d-%02d   %6.2f %6.2f %6.2f %6.2f'
    trip = when.triple()
    print fmt % (trip[0], trip[1], trip[2],
                 venus.phase, venus.mag, venus.earth_distance, venus.size)

# Loop from the beginning of 2012 through the middle of 2013:
d = ephem.date('2012')
end_date = ephem.date('2013/6/1')
while d < end_date :
    print_venus(d)
    # Add a week:
    d = ephem.date(d + ephem.hour * 24)

import PythonMagick
filename = 'img001.jpg'
img = PythonMagick.Image(filename)
size = img.size()
print filename, "is", size.width(), "x", size.height()

>>> img.scale('1024x768')
>>> img.size().height()
640

>>> help(img.scale)
Help on method scale:

scale(...) method of PythonMagick.Image instance
    scale( (Image)arg1, (Geometry)arg2) -> None :

        C++ signature :
            void scale(Magick::Image {lvalue},Magick::Geometry)

from PIL import Image
im = Image.open(filename)
w = im.size[0]
h = im.size[1]
print filename, "is", w, "x", h

newim = im.resize((w/2, h/2))
newim.save("small-" + filename)

import PIL.ExifTags

exif = im._getexif()
for tag, value in exif.items():
    decoded = PIL.ExifTags.TAGS.get(tag, tag)
    print decoded, '->', value

for tag, value in exif.items():
    decoded = PIL.ExifTags.TAGS.get(tag, tag)
    if decoded == 'Orientation':
        print decoded, ":", value

from HTMLParser import HTMLParser

class MyFancyHTMLParser(HTMLParser):
  def fetch_url(self, url) :
    request = urllib2.Request(url)
    response = urllib2.urlopen(request)
    link = response.geturl()
    html = response.read()
    response.close()
    self.feed(html)   # feed() starts the HTMLParser parsing

  def handle_starttag(self, tag, attrs):
    if tag == 'img' :
      # attrs is a list of tuples, (attribute, value)
      srcindex = self.has_attr('src', attrs)
      if srcindex < 0 :
        return   # img with no src tag? skip it
      src = attrs[srcindex][1]
      # Make relative URLs absolute
      src = self.make_absolute(src)
      attrs[srcindex] = (attrs[srcindex][0], src)

    print '<' + tag
    for attr in attrs :
      print ' ' + attr[0]
      if len(attr) > 1 and type(attr[1]) == 'str' :
        # make sure attr[1] doesn't have any embedded double-quotes
        val = attr[1].replace('"', '\"')
        print '="' + val + '"')
    print '>'

  def handle_endtag(self, tag):
    self.outfile.write('</' + tag.encode(self.encoding) + '>\n')

  tree = lxml.html.fromstring(html)

for e in tree.iter() :
  print e.tag

def crawl_tree(tree) :
  handle_starttag(tree.tag, tree.attrib)
  if tree.text :
    handle_data(tree.text)
  for node in tree :
    crawl_tree(node)
  handle_endtag(tree.tag)

def crawl_tree(tree) :
  if type(tree.tag) is str :
    handle_starttag(tree.tag, tree.attrib)
    if tree.text :
      handle_data(tree.text)
    for node in tree :
      crawl_tree(node)
    handle_endtag(tree.tag)
  if tree.tail :
    handle_data(tree.tail)

import ephem
observer = ephem.city('San Francisco')
sun = ephem.Sun()
sun.compute(observer)
print sun.alt, sun.az

observer = ephem.Observer()
observer.name = "San Jose"
observer.lon = '-121:56.8'
observer.lat = '37:15.55'

    for m in range(1, 13) :
        observer.date('2011/%d/15 12:00' % (m))
        sun.compute(observer)

    # Y scale is 45 degrees (PI/2), horizon to halfway to zenith:
    y = int(self.height - float(self.sun.alt) * self.height / math.pi)
    # So make X scale 45 degrees too, centered around due south.
    # Want az = PI to come out at x = width/2.
    x = int(float(self.sun.az) * self.width / math.pi / 2)
    # print self.sun.az, float(self.sun.az), float(self.sun.alt), x, y
    self.drawing_area.window.draw_arc(self.xgc, True, x, y, 4, 4, 0, 23040)

    date = '2011/%d/12 12:00' % (m)
    adjtime = ephem.date(ephem.date(date) \
                    - float(self.observer.lon) * 12 / math.pi * ephem.hour)
    observer.date = adjtime

>>> ephem.next_solstice('2011/8/1')
2011/12/22 05:29:52

ephem.date(ephem.next_solstice('2011/8/1') - 8./24)
2011/12/21 21:29:52

>>> import ephem
>>> observer = ephem.city("San Francisco")
>>> sun = ephem.Sun()
>>> for i in range(20,25) :
...   d = '2011/12/%i 20:00' % i
...   print d, (observer.next_setting(sun, d) - observer.previous_rising(sun, d)) * 24
2011/12/20 20:00 9.56007901422
2011/12/21 20:00 9.55920379754
2011/12/22 20:00 9.55932991847
2011/12/23 20:00 9.56045709446
2011/12/24 20:00 9.56258416496

    Serial.begin(9600);

    Serial.println(val);

import serial

ser = serial.Serial("/dev/ttyUSB0", 9600)
while True:
    print ser.readline()

while True :
    # Check whether the user has typed anything (timeout of .2 sec):
    inp, outp, err = select.select([sys.stdin, self.ser], [], [], .2)

    # If the user has typed anything, send it to the Arduino:
    if sys.stdin in inp :
        line = sys.stdin.readline()
        self.ser.write(line)

    # If the Arduino has printed anything, display it:
    if self.ser in inp :
line = self.ser.readline().strip()
print "Arduino:", line

  Override Redirect State: yes

from Xlib import display

dpy = display.Display()
screen = dpy.screen()
root = screen.root
tree = root.query_tree()

for w in tree.children :
    print w

for w in tree.children :
    print w.get_wm_name(), w.get_attributes()

for w in tree.children :
    att = w.get_attributes()
    if att.map_state and att.override_redirect :
        print w.get_wm_name(), att

for w in tree.children :
    att = w.get_attributes()
    if att.map_state and att.override_redirect and w.get_wm_transient_for():
        w.unmap()

dpy.flush()

    <keybind key="W-t">
      <action name="Execute">
        <execute>/home/akkana/bin/countsel</execute>
      </action>
    </keybind>

import xlrd

for filename in sys.argv[1:] :
    wb = xlrd.open_workbook(filename)
    for sheetname in wb.sheet_names() :
        sh = wb.sheet_by_name(sheetname)
        for rownum in range(sh.nrows) :
            print sh.row_values(rownum)

server = "mail.example.com"
port = 995
user = "myname"
passwd = "seekrit"

pop = poplib.POP3_SSL(server, port)
pop.user(user)
pop.pass_(passwd)

poplist = pop.list()
if poplist[0].startswith('+OK') :
    msglist = poplist[1]
    for msgspec in msglist :
        # msgspec is something like "3 3941", 
        # msg number and size in octets
        msgnum = int(msgspec.split(' ')[0])
        print "Deleting msg %d\r" % msgnum,
        pop.dele(msgnum)
    else :
        print "No messages for", user
else :
    print "Couldn't list messages: status", poplist[0]
pop.quit()

$ sudo apt-get install rpm

$ python setup.py bdist_rpm

#!/usr/bin/env python
# Set the volume louder or softer, depending on program name.

import alsaaudio, sys, os

increment = 4

# First find a mixer. Use the first one.
try :
    mixer = alsaaudio.Mixer('Master', 0)
except alsaaudio.ALSAAudioError :
    sys.stderr.write("No such mixer\n")
    sys.exit(1)

cur = mixer.getvolume()[0]
if os.path.basename(sys.argv[0]).startswith("louder") :
    mixer.setvolume(cur + increment, alsaaudio.MIXER_CHANNEL_ALL)
else :
    mixer.setvolume(cur - increment, alsaaudio.MIXER_CHANNEL_ALL)
print "Volume from", cur, "to", mixer.getvolume()[0]

import sys, simplejson, urllib, urllib2

def get_search_data(query):
    s = simplejson.loads(urllib2.urlopen(
            urllib2.Request("http://search.twitter.com/search.json",
                            urllib.urlencode({"q": query}))).read())
    return s

def json_search(query):
    for data in get_search_data(query)["results"]:
        yield data

if __name__ == "__main__" :
    for searchterm in sys.argv[1:] :
        print "**** Tweets containing", searchterm
        statuses = json_search(searchterm)
        for st in statuses :
            print st['created_at']
            print "<%s> %s" % (st['from_user'], st['text'])
            print ""

#! /usr/bin/env python

# Cartalk puzzler Feb 2011

import random, time

random.seed()

tot = 0
wins = 0

while True:
    # pick 3 numbers:
    n1 = random.randint(0, 100)
    n2 = random.randint(0, 100)
    n3 = random.randint(0, 100)

    # Always look at but discard the first number.
    # If the second number is greater than the first, stick with it;
    # otherwise choose the third number.
    if n2 > n1 :
        final = n2
    else :
        final = n3

    biggest = max(n1, n2, n3)
    win = (final == biggest)
    tot += 1
    if win :
        wins += 1
    print "%4d %4d %4d %10d %10s %6d/%-6d = %10d%%" % (n1, n2, n3, final,
                                                       str(win),
                                                       wins, tot,
                                                       int(wins*100/tot))
    if tot % 1000 == 0:
        print "(%d ...)" % tot
        time.sleep(1)

#! /usr/bin/env python

# Display the colors available in a terminal.

print "16-color mode:"
for color in range(0, 16) :
    for i in range(0, 3) :
        print "\033[0;%sm%02s\033[m" % (str(color + 30), str(color)),
    print

# Programs like ls and vim use the first 16 colors of the 256-color palette.
print "256-color mode:"
for color in range(0, 256) :
    for i in range(0, 3) :
        print "\033[38;5;%sm%03s\033[m" % (str(color), str(color)),
    print

$ grep color /etc/X11/app-defaults/XTerm-color
irrelevant stuff snipped
*VT100*color0: black
*VT100*color1: red3
*VT100*color2: green3
*VT100*color3: yellow3
*VT100*color4: blue2
*VT100*color5: magenta3
*VT100*color6: cyan3
*VT100*color7: gray90
*VT100*color8: gray50
*VT100*color9: red
*VT100*color10: green
*VT100*color11: yellow
*VT100*color12: rgb:5c/5c/ff
*VT100*color13: magenta
*VT100*color14: cyan
*VT100*color15: white
! Disclaimer: there are no standard colors used in terminal emulation.
! The choice for color4 and color12 is a tradeoff between contrast, depending
! on whether they are used for text or backgrounds.  Note that either color4 or
! color12 would be used for text, while only color4 would be used for a
! Originally color4/color12 were set to the names blue3/blue
!*VT100*color4: blue3
!*VT100*color12: blue
!*VT100*color4: DodgerBlue1
!*VT100*color12: SteelBlue1

!! color2 was green3
*VT100*color2: green4
!! color8 was gray50
*VT100*color8: gray30
!! color10 was green
*VT100*color10: rgb:00/aa/00
!! color11 was yellow
*VT100*color11: dark orange
!! color14 was cyan
*VT100*color14: dark cyan

import sys

class tee :
    def __init__(self, _fd1, _fd2) :
        self.fd1 = _fd1
        self.fd2 = _fd2

    def __del__(self) :
        if self.fd1 != sys.stdout and self.fd1 != sys.stderr :
            self.fd1.close()
        if self.fd2 != sys.stdout and self.fd2 != sys.stderr :
            self.fd2.close()

    def write(self, text) :
        self.fd1.write(text)
        self.fd2.write(text)

    def flush(self) :
        self.fd1.flush()
        self.fd2.flush()

stderrsav = sys.stderr
outputlog = open(logfilename, "w")
sys.stderr = tee(stderrsav, outputlog)

drawing_area.connect("button-release-event", button_event)
drawing_area.set_events(gtk.gdk.EXPOSURE_MASK |
                        # next line wasn't needed before:
                        gtk.gdk.BUTTON_PRESS_MASK |
                        gtk.gdk.BUTTON_RELEASE_MASK )

#!/usr/bin/env python
# python-gtk-webkit presentation program.
# Copyright (C) 2009 by Akkana Peck.
# Share and enjoy under the GPL v2 or later.

import sys
import gobject
import gtk
import webkit

class WebBrowser(gtk.Window):
    def __init__(self, url):
        gtk.Window.__init__(self)
        self.fullscreen()

        self._browser= webkit.WebView()
        self.add(self._browser)
        self.connect('destroy', gtk.main_quit)

        self._browser.open(url)
        self.show_all()

if __name__ == "__main__":
    if len(sys.argv) <= 1 :
        print "Usage:", sys.argv[0], "url"
        sys.exit(0)

    gobject.threads_init()
    webbrowser = WebBrowser(sys.argv[1])
    gtk.main()

grep find `egrep -l '#\\!.*python' *`
grep find `file * | grep python | sed 's/:.*//'`
i in foo; file $i|grep python && grep find $i; done    # in sh/bash

alias greplang "grep \!:2-$ `file * | grep \!:1 | sed 's/:.*//'`"

langgrep python -w find ~/bin/*

from array import array

[ ... setting up ... ]
        # initialize the regions and get their contents into arrays:
        srcRgn = layer.get_pixel_rgn(0, 0, srcWidth, srcHeight,
                                     False, False)
        src_pixels = array("B", srcRgn[0:srcWidth, 0:srcHeight])

        dstRgn = destDrawable.get_pixel_rgn(0, 0, newWidth, newHeight,
                                            True, True)
        p_size = len(srcRgn[0,0])               
        dest_pixels = array("B", "\x00" * (newWidth * newHeight * p_size))

[ ... then inside the loop over x and y ... ]
                        src_pos = (x + srcWidth * y) * p_size
                        dest_pos = (newx + newWidth * newy) * p_size

                        newval = src_pixels[src_pos: src_pos + p_size]
                        dest_pixels[dest_pos : dest_pos + p_size] = newval

[ ... when the loop is all finished ... ]
        # Copy the whole array back to the pixel region:
        dstRgn[0:newWidth, 0:newHeight] = dest_pixels.tostring() 

(sleep 300; zenity --info --text="Turn off the water!") &

export DISPLAY=:0.0
zenity --info --text="Your cornbread is ready"

eggtimer 5 Turn off the water

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Shallow Thoughts : tags : python

Tue, 28 May 2013

Sat, 25 May 2013

Auto-detecting terminal size

How it works

Reading the answer

stty in python

Wed, 15 May 2013

Sat, 13 Apr 2013

Tue, 19 Mar 2013

Split the list of words into a list of letters

Flatten the list of lists

A simpler way of making the set

What letters are not in the set?

Sat, 16 Mar 2013

Thu, 21 Feb 2013

Sat, 19 Jan 2013

Wed, 31 Oct 2012

Wed, 17 Oct 2012

Wed, 26 Sep 2012

Wed, 19 Sep 2012

Sun, 02 Sep 2012

Geeky programming commentary

Linked input fields

Image parasites

Not prompting for JPG settings

That darned invisible JPG settings dialog

Tue, 21 Aug 2012

How it's written

A Save-as dialog with smart directory default

Keeping count in Python

Sat, 09 Jun 2012

Viewing and modifying epub tags

Managing epub in Python

Python's difficulty with character sets in XML

The final script

Sat, 26 May 2012

Fri, 27 Apr 2012

Tracking Venus with PyEphem

Fri, 16 Mar 2012

ImageMagick: undocumented and inconstant

PIL -- the Python Imaging Library

Reading EXIF

Sun, 08 Jan 2012

The bad news about HTMLParser

Using lxml.html

Thu, 29 Dec 2011

Calculating analemmas in PyEphem

Time is always a problem

Thu, 22 Dec 2011

The shortest day

Wed, 16 Nov 2011

Sun, 16 Oct 2011

Serial output from Python

Serial input as well as output

Tue, 27 Sep 2011

Finding window type

Python-Xlib

Window type, redux

Multiple tooltips: flushing the display

Fri, 09 Sep 2011

Getting the X selection from Python

Xchat plug-in for a much more elegant solution

Wed, 31 Aug 2011

Thu, 25 Aug 2011

Fri, 19 Aug 2011

Fri, 12 Aug 2011

Fri, 05 Aug 2011

Sat, 30 Jul 2011

Fri, 22 Jul 2011

Fri, 15 Jul 2011

Fri, 08 Jul 2011

Sun, 03 Jul 2011

Fri, 24 Jun 2011

Thu, 16 Jun 2011

Fri, 20 May 2011

What about Debian packages?

Fri, 13 May 2011

Mon, 18 Apr 2011

Fri, 18 Mar 2011