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...

Code Block
k = ['a', 'b', 'c'] v = [1, 2, 3]  d = dict(zip(keys, values)) >>> print dictionary {'a': 1, 'b': 2, 'c': 3}

 

Manipulation with directories and files

Access to files in the derectory

Sorted list

Get sorted list from non-sorted:

Code Block
lst_sorted = sorted(lst)

Define non-default order of elements:

Code Block
Code Block
def getListOfFilesInDir(dirname) :
    return os.listdir(dirname)

def printListOfFilesInDir(dirnamedef __cmp__(self, other) :
    print 'List of files in the dir.', dirname
    """Method for name in os.listdir(dirname) :sorted()"""
        print name
if self.begin  < other.begin : print '\n'

Parsing the pathname

Code Block
return -1
        if root,self.begin ext => os.path.splitext(path) # i.e. path='root-part.tail-part'other.begin : return  1
        basenameif self.begin == os.path.basename(path)
other.begin : 
         dirname   =if os.path.dirname(path)
self.end  < other.end : return  1 lexist# inverse comparison  = os.path.lexists(path)for end
        isfile    =if os.path.isfile(path)self.end  > other.end : return -1 
        isdir    if self.end == os.path.isdir(path)
        head, tail= other.end : return  0

 

Exceptions

Standard exceptions

Raise exceprion

Code Block
if not os.path.splitlexists(pathfname) : raise IOError('File %s # i.e. path='head-part/tail-part'
...

http://docs.python.org/library/os.path.html

Joint path and name

is not available' % fname)

Catch exception

Code Block
    try :
Code Block
        path_name   plf = os.path.join(path,PeakListFile(fname)

Useful string parsing options

http://docs.python.org/library/string.html

Code Block
     string.rsplit(str, sep, maxsplit)except Exception as e:
    string.capitalize(word)
    string.lower(s)
    start = string.find(symbolic_string, pattern)
    pattern_length = len(pattern)

http://docs.python.org/library/parser.html?

Or use more shorter methods for str object:
http://docs.python.org/library/stdtypes.html, for example:

Code Block
    par_str = line[pos_eq+1:].strip(' ').rstrip('\n')

Replace the part of the string

Code Block
 my_string.replace("abcde","cde")

 

String formatting

Code Block
s = 'some text %s  %s' % (msg.ljust(30), str(val).rjust(30)

List of comprehension

list_of_x2 = [x*x for x in list_of_x]

list_of_x_selected = [x for x,y in zip(list_of_x, list_of_y) if y>0]

 

Polymorphism

Derived class initialization

Code Block
class Base :
    def __init__(self) :
       ...
       
class Derived(Base) :
    def __init__(self) :
        Base.__init__(self)
        # OR
        super(Derived, self).__init__()

 

 

 

Python - useful references

Built-in functions

http://docs.python.org/library/functions.html

setattr - gives dynamic variables in python

print 'We cought exception: %s' % e

User defined exception

Code Block
class MyError(Exception):
    def __init__(self, value):
        self.value = value
    def __str__(self):
        return repr(self.value)
...
try:
    raise MyError(2*2)
except MyError as e:
    print 'My exception occurred, value:', e.value

 

Manipulation with directories and files

Access to files in the derectory

Code Block
def getListOfFilesInDir(dirname) :
    return os.listdir(dirname)

def printListOfFilesInDir(dirname) :
    print 'List of files in the dir.', dirname
    for name in os.listdir(dirname) :
        print name
    print '\n'

Parsing the pathname

Code Block
path = '/reg/d/psdm/cxi/cxif5315/calib/pnccd/pnccd-123456.data'

root, ext = os.path.splitext(path) # ('/reg/d/psdm/cxi/cxif5315/calib/pnccd/pnccd-123456', '.data') # or '' if something is missing
basename  = os.path.basename(path) # pnccd-123456.data 
dirname   = os.path.dirname(path)  # /reg/d/psdm/cxi/cxif5315/calib/pnccd
lexist    = os.path.lexists(path)  # False
isfile    = os.path.isfile(path)   # False
isdir     = os.path.isdir(path)    # False
head, tail= os.path.split(path)    # ('/reg/d/psdm/cxi/cxif5315/calib/pnccd', 'pnccd-123456.data') # or '' if something is missing
...

http://docs.python.org/library/functionsos.path.html#setattr

 

 

PyQt4

PyQt4 class references

All classes
Selected:

Open/close/move other GUI window

...

html

Join list of strings

Code Block
s = ' '.join(sys.argv)

Join path and name

Code Block
    def processConfigPars(self):
   path_name =    print 'processConfigPars'
        try :
            cp.confpars.guiconfigparameters.close()
        except : # AttributeError: #NameError 
            cp.confpars.guiconfigparameters = guiconfigpars.GUIConfigParameters(os.path.join(path,fname)

Check if string contains pattern

Code Block
exp = 'xpptut13'
if 'tut' is in exp : <do something>

String alignment

Code Block
msg = '%s' % (k.ljust(16))

Useful string parsing options

http://docs.python.org/library/string.html

Code Block
    string.rsplit(str, sep, maxsplit)
    string.capitalize(word)
    string.lower(s)
    start = string.find(symbolic_string, pattern)
    pattern_length        cp.confpars.guiconfigparameters.move(self.pos().__add__(QtCore.QPoint(100,330))) # window offset
            # or use self.parentWidget().pos() for combined widgets:
            # cp.guifilebrowser.move(self.parentWidget().pos().__add__(QtCore.QPoint(240,40)))
            cp.confpars.guiconfigparameters.show()
Note

Sometime it looks like the window does not want to move in specified position...
In particular I have observed, that everything is going correct untill the w.show(). then, suddenly happens moveEvent(), which changes the self.pos(). In my case it happened because at construction of the combined window, its size was changed and it was moved in origin... Reservation of larger window size solved this problem.

Close window and delete object

Code Block
    def closeEvent(self, event):
        try: # try to delete self object in the cp.confpars
            del cp.confpars.guiconfigparameters 
        except # AttributeError:
            pass # silently ignore

Change style of buttons depending on status

For particular QPushButton it works:

Code Block
self.but_path = QtGui.QPushButton('File:')
self.but_path.setObjectName('but_path')
self.but_path.setStyleSheet('QPushButton#but_path:pressed  {color: black; background-color: green;}' +
                            'QPushButton#but_path:disabled {color: white; background-color: pink;}' +
                            'QPushButton                   {color:  blue; background-color: yellow;}')

For entire application it should be like:

Code Block
app = QtGui.QApplication.instance()
app.setStyleSheet('QLabel{color: #fff;} QPushButton{background-color: #000; color: #fff}')

but does not work for me...

Make window visible on the top

Code Block
 widg.raise_()

Scroll down text in

Assuming

Code Block
 self.box_txt = QtGui.QTextEdit()
 self.box_txt.setText('some text')
 self.box_txt.append('a lot of additional text, exceeding the window size')
 self.box_txt.ensureCursorVisible()

Scroll bar can be used, but result is not seen imidiately:

Code Block
  scrol_bar_v = self.box_txt.verticalScrollBar() # QScrollBar
  scrol_bar_v.setValue(scrol_bar_v.maximum())

Moving text cursor with repaint() works immidiately:

Code Block
  self.box_txt.moveCursor(QtGui.QTextCursor.End)
  self.box_txt.repaint()

Set optimal table-widget size

Code Block
    self.table = QtGui.QTableWidget(rows, cols, self)
    ...
    self.table.setFixedWidth(self.table.horizontalHeader().length() + 4)
    self.table.setFixedHeight(self.table.verticalHeader().length() + 29)

Show image in QLabel

Assumes:

= len(pattern)

http://docs.python.org/library/parser.html?

Or use more shorter methods for str object:
http://docs.python.org/library/stdtypes.html, for example:

Code Block
    par_str = line[pos_eq+1:].strip(' ').rstrip('\n')

Replace the part of the string

Code Block
 my_string.replace("abcde","cde")

String formatting

Code Block
s = 'some text %s  %s' % (msg.ljust(30), str(val).rjust(30)

Class string properties

Code Block
    print 'string properties:'
    print 'punctuation    :  ', string.punctuation
    print 'digits         :  ', string.digits
    print 'octdigits      :  ', string.octdigits
    print 'hexdigits      :  ', string.hexdigits
    print 'ascii_letters  :  ', string.ascii_letters
    print 'ascii_lowercase:  ', string.ascii_lowercase
    print 'ascii_uppercase:  ', string.ascii_uppercase
    print 'lowercase      :  ', string.lowercase
    print 'uppercase      :  ', string.uppercase
    print 'letters        :  ', string.letters
    print 'printable      :  ', string.printable
    print 'whitespace     :  ', string.whitespace

Class name

Code Block
self.__class__.__name__

Function name

Code Block
sys._getframe().f_code.co_name

Function parameters

Code Block
locals() # returns (dict) of method input parameters

Converting integer to bin(), oct(), hex() string

using built-in functions

Code Block
ival = 123456
str_bin = bin(ival)
str_oct = oct(ival)
str_hex = hex(ival)

Time stamp

Code Block
from time import localtime, gmtime, strftime, clock, time

time_sec = time() # epoch time

def get_current_local_time_stamp(fmt='%Y-%m-%d %H:%M:%S %Z'):
    return strftime(fmt, localtime())

def get_current_gm_time_stamp(fmt='%Y-%m-%d %H:%M:%S %Z'):
    return strftime(fmt, gmtime())

def get_local_time_str(time_sec, fmt='%Y-%m-%d %H:%M:%S %Z'):
    return strftime(fmt, localtime(time_sec))

def get_gm_time_str(time_sec, fmt='%Y-%m-%d %H:%M:%S %Z'):
    return strftime(fmt, gmtime(time_sec))

Set PYTHONPATH

In command-line:

Code Block
setenv PYTHONPATH /reg/neh/home1/dubrovin/LCLS/git-work/pyapps:${PYTHONPATH}

In cshell script:

Code Block
alias setpp 'setenv PYTHONPATH /reg/neh/home1/dubrovin/LCLS/git-work/pyapps:${PYTHONPATH}'

In code:

Code Block
import os
os.environ['PYTHONPATH'] = '/reg/neh/home1/dubrovin/LCLS/git-work/pyapps:%s' % os.environ.get('PYTHONPATH', '')

Replace symbols in string

Code Block
text.replace("|",":").replace("-",".")
range.replace('9999','end')
msg.replace('\n',' ')

List of comprehension

list_of_x2 = [x*x for x in list_of_x]

list_of_x_selected = [x for x,y in zip(list_of_x, list_of_y) if y>0]

map -  built-in method

Code Block
def f(x,y) :
    return x if y>0 else -x

list = map(f, arrX, arrY)

Constructor, destructor etc.

Code Block
class PeakListFile :
    def
Code Block
class GUIImage ( QtGui.QLabel ) :
    def __init__ (self, parent=None, app=None) :

        QtGui.QLabel.__init__(self, parentfname) :
	    print 'constructor'
        self.setGeometryf=open(200, 100, 100, 100)
fname,'r')

    def __del__(self) :
	    print 'destructor'
   self.setWindowTitle('Image For Grabber')

     try :
            self.setFramef.close()

        ...

i.e. self is an instance of QLabel.

...

def __call__(self) :
	    print 'this is a default method of this object called as obj()'

Polymorphism

Derived class initialization

Code Block
class Base :
    def __init__(self) :
       ...
       
class Derived(Base) :
    def __init__(self) :
        Base.__init__(self)
        # OR
        super(Derived, self).__init__()

Create/save temporary file

Code Block
import tempfile
tmp_file = tempfile.NamedTemporaryFile(mode='r+b',suffix='.tiff')
tfile = tmp_file.name

Good example of __main__

Code Block
import sys

def test_all() :
    print _sep_, '\n%s' % sys._getframe().f_code.co_name
    test_ricker()
    test_morlet()

#------------------------------
if __name__ == "__main__" :
    from time import time
    tname = sys.argv[1] if len(sys.argv) > 1 else '0'
    print 50*'_', '\nTest %s:' % tname
    t0_sec = time()
    if   tname == '0': test_all() 
    elif tname == '1': test_ricker()
    elif tname == '2': test_morlet()
    else : print 'Not-recognized test name: %s' % tname
    msg = 'End of test %s, consumed time (sec) = %.6f' % (tname, time()-t0_sec)
    sys.exit(msg)

Virtualenv

Code Block
virtualenv dir-name
source <directoryName>/bin/activate.csh # for tcsh
# or
source <directoryName>/bin/activate     # for bash
pip install <packageName>

... work

deactivate

Python - useful references

Built-in functions

http://docs.python.org/library/functions.html

setattr, getattr - set/get dynamic variables in python

http://docs.python.org/library/functions.html#setattr

PyQt4

Know How

  • QGraphicsScene item priority is set by setZValue(v)
  • All re-implemented Event methods like {{mouseMoveEvent(self, e)}} etc. in items will get control only if QGraphicsView their default version will be called.

PyQt4 class references

All classes
Selected:

Open/close/move other GUI window

Try to close window if its object exists, othervise - open:

Code Block
    def processConfigPars(self):
        print 'processConfigPars'
        try :
            cp.confpars.guiconfigparameters.close()
        except : # AttributeError: #NameError 
            cp.confpars.guiconfigparameters = guiconfigpars.GUIConfigParameters()
            cp.confpars.guiconfigparameters.move(self.pos().__add__(QtCore.QPoint(100,330))) # window offset
            # or use self.parentWidget().pos() for combined widgets:
            # cp.guifilebrowser.move(self.parentWidget().pos().__add__(QtCore.QPoint(240,40)))
            cp.confpars.guiconfigparameters.show()
Note

Sometime it looks like the window does not want to move in specified position...
In particular I have observed, that everything is going correct untill the w.show(). then, suddenly happens moveEvent(), which changes the self.pos(). In my case it happened because at construction of the combined window, its size was changed and it was moved in origin... Reservation of larger window size solved this problem.

Close window and delete object

Code Block
    def closeEvent(self, event):
        try: # try to delete self object in the cp.confpars
            del cp.confpars.guiconfigparameters 
        except # AttributeError:
            pass # silently ignore

Change style of buttons depending on status

For particular QPushButton it works:

Code Block
self.but_path = QtGui.QPushButton('File:')
self.but_path.setObjectName('but_path')
self.but_path.setStyleSheet('QPushButton#but_path:pressed  {color: black; background-color: green;}' +
                            'QPushButton#but_path:disabled {color: white; background-color: pink;}' +
                            'QPushButton                   {color:  blue; background-color: yellow;}')

For entire application it should be like:

Code Block
app = QtGui.QApplication.instance()
app.setStyleSheet('QLabel{color: #fff;} QPushButton{background-color: #000; color: #fff}')

but does not work for me...

Make window visible on the top

Code Block
 widg.raise_()

Scroll down text in

Assuming

Code Block
 self.box_txt = QtGui.QTextEdit()
 self.box_txt.setText('some text')
 self.box_txt.append('a lot of additional text, exceeding the window size')
 self.box_txt.ensureCursorVisible()

Scroll bar can be used, but result is not seen imidiately:

Code Block
  scrol_bar_v = self.box_txt.verticalScrollBar() # QScrollBar
  scrol_bar_v.setValue(scrol_bar_v.maximum())

Moving text cursor with repaint() works immidiately:

Code Block
  self.box_txt.moveCursor(QtGui.QTextCursor.End)
  self.box_txt.repaint()

Set optimal table-widget size

Code Block
    self.table = QtGui.QTableWidget(rows, cols, self)
    ...
    self.table.setFixedWidth(self.table.horizontalHeader().length() + 4)
    self.table.setFixedHeight(self.table.verticalHeader().length() + 29)

Show image in QLabel

Assumes:

Code Block
class GUIImage ( QtGui.QLabel ) :
    def __init__ (self, parent=None, app=None) :

        QtGui.QLabel.__init__(self, parent)

        self.setGeometry(200, 100, 100, 100)
        self.setWindowTitle('Image For Grabber')

        self.setFrame()
        ...

i.e. self is an instance of QLabel.

Set pixmap for image

Code Block
    def setPixmapForImage(self):
        if self.r_pixmap == None :
            self.s_pixmap = None
            self.clear()
        else :
            self.s_pixmap = self.r_pixmap.scaled(self.size(), QtCore.Qt.KeepAspectRatio)
            self.setPixmap(self.s_pixmap)
            self.setAlignment(QtCore.Qt.AlignTop | QtCore.Qt.AlignLeft)
            self.setScailedMask()

Grab image from monitor

Code Block
    import tempfile    
    def grabImage(self):
        fname = tempfile.NamedTemporaryFile(mode='r+b',suffix='.ppm')
        if( 0 == os.system('import -trim -frame -border %s' % (fname.name))) :
            self.r_pixmap = QtGui.QPixmap(QtGui.QImage(fname.name,'.ppm')) 
            self.setPixmapForImage()

Supported in QImage formats: 

FormatDescriptionQt's support
BMPWindows BitmapRead/write
GIFGraphic Interchange Format (optional)Read
JPGJoint Photographic Experts GroupRead/write
JPEGJoint Photographic Experts GroupRead/write
PNGPortable Network GraphicsRead/write
PBMPortable BitmapRead
PGMPortable GraymapRead
PPMPortable PixmapRead/write
TIFFTagged Image File FormatRead/write
XBMX11 BitmapRead/write
XPMX11 PixmapRead/write

 

Grab entire monitor window

Code Block
    def setPixmapForImagegrabEntireWindow(self):
        if self.r_pixmap == None :
            self.s_pixmap = None= QtGui.QPixmap.grabWindow(QtGui.QApplication.desktop().winId())
            self.clearsetPixmapForImage()
        else :
            self.s_pixmap = self.r_pixmap.scaled(self.size(), QtCore.Qt.KeepAspectRatio)

Load image from file

Code Block
   def loadImageFromFile(self, fname) : 
        #Read formats: bmp, jpg, jpeg, png,  self.setPixmap(self.s_pixmap)
    ppm, xbm, xpm + gif, pbm, pgm, 
        self.setAlignment(QtCore.Qt.AlignTop | QtCore.Qt.AlignLeft)
r_pixmap = QtGui.QPixmap(QtGui.QImage(fname))     
        self.setScailedMasksetPixmapForImage()

...

Set the mask to suppress the background layer

Code Block
    def grabImagesetScailedMask(self):
        fnamesize = tempfile.NamedTemporaryFile(mode='r+b',suffix='.ppm'self.s_pixmap.size()
        if(print 0'Scaled == os.system('import -trim -frame -border %spixmap size: %d x %d' % (fnamesize.name)width(), size.height())
   :
     #==================================
        self.rqimage_pixmapmask = QtGui.QPixmapQImage(size, QtGui.QImage(fname.nameFormat_Mono)) 
            self.setPixmapForImageqimage_mask.fill(0)

Grab entire monitor window

Code Block
        self.qbitmap_mask def grabEntireWindow= QtGui.QBitmap.fromImage(self.qimage_mask):
        self.rs_pixmap = QtGui.QPixmap.grabWindow(QtGui.QApplication.desktop().winId())
.setMask(self.qbitmap_mask)
         self.setPixmapForImage()

...

#==================================

Save image in file

Code Block
    def loadImageFromFilesaveImageInFile(self, fname='test.png') : 
        #Read#Write formats: bmp, jpg, jpeg, png, ppm, xbm, xpm + gif, pbm, pgm, 
        self.r_pixmap = QtGui.QPixmap(QtGui.QImage(fname))     
        self.setPixmapForImage()

Set the mask to suppress the background layer

Code Block
    def setScailedMask(self): jpeg, png, pbm, pgm, ppm, xbm, xpm
        size =if self.sr_pixmap.size()
 is not None :
    print 'Scaled pixmap size: %d x %d' % (size.width(), size.height())
        #==================================self.r_pixmap.save(fname, format=None)

Set transparent frame

Code Block
    def setFrame(self):
        self.qimage_maskframe = QtGui.QImage(size, QtGui.QImage.Format_MonoQFrame(self)
        self.qimage_maskframe.fill(0)setFrameStyle( QtGui.QFrame.Box | QtGui.QFrame.Sunken ) #Box, Panel | Sunken, Raised 
        self.qbitmap_mask = QtGui.QBitmap.fromImage(self.qimage_maskframe.setLineWidth(0)
        self.s_pixmap.setMask(self.qbitmap_maskframe.setMidLineWidth(1)
        #==================================

Save image in file

Code Block
self.frame.setGeometry(self.rect())
      def saveImageInFile(self, fname='test.png'):  #self.frame.setVisible(False)
        self.frame.setStyleSheet('background: transparent;')

Resize event

Code Block
    def resizeEvent(self, e):#Write formats: bmp, jpg, jpeg, png, pbm, pgm, ppm, xbm, xpm
        ifs = self.r_pixmap is not None :size()
        self.frame.setGeometry(QtCore.QRect(0,0,s.width(),s.height()))
            self.r_pixmap.save(fname, format=None)

Set transparent frame

Code Block
    def setFrame(self):
        self.frame = QtGui.QFrame(self)
        self.frame.setFrameStyle( QtGui.QFrame.Box | QtGui.QFrame.Sunken ) #Box, Panel | Sunken, Raised 
        self.frame.setLineWidth(0)
        self.frame.setMidLineWidth(1)
        self.frame.setGeometry(self.rect())
        #self.frame.setVisible(False)
        self.frame.setStyleSheet('background: transparent;')

Resize event

self.setPixmapForImage()

Get window size and position

Global (top-left) point of the window on monitor:

point = self.mapToGlobal(QtCore.QPoint(0,0)) - changing in resizeEvent(...) and moveEvent(...)

x,y,w,h = size.size().x(), size.size().y(), size.size().width(), size.size().height()

where  - w and h changing in resizeEvent(...),

x,y changing in moveEvent(...) only.

Window relative dims: rect = self.rect() - changing in resizeEvent(...)

Show image in QtGui.QGraphicsView

QGraphicsView is a class with scrolled graph window...

 

Repaint widget immediately when its property is changed

When QPushButton is pressed and connected method is called, all button properties stay unchanged until the method. In order to see current changes one has to repaint widget. For example:

Code Block
 
Code Block
    def resizeEvent(self, e):
        s = self.size()
        self.framebut_elog.setGeometrysetStyleSheet(QtCore.QRect(0,0,s.width(),s.height()))cp.styleButton) 
        self.setPixmapForImage()

Get window size and position

Global (top-left) point of the window on monitor:

point = self.mapToGlobal(QtCore.QPoint(0,0)) - changing in resizeEvent(...) and moveEvent(...)

x,y,w,h = size.size().x(), size.size().y(), size.size().width(), size.size().height()

where  - w and h changing in resizeEvent(...),

x,y changing in moveEvent(...) only.

Window relative dims: rect = self.rect() - changing in resizeEvent(...)

Show image in QtGui.QGraphicsView

    self.but_elog.setEnabled(False)
            self.repaint()

Dialog boxes

For password

Code Block
    app = QtGui.QApplication(sys.argv)
    w = QtGui.QInputDialog()
    w.show()
    msg = 'To use %s and submitt messages in ELog\nauthentication for user %s is required\nPassword:' % (sys.argv[0], opts.usr)
    text, ok = w.getText(None, 'Authentication', msg, QtGui.QLineEdit.Password)
    w.close()
...

 QGraphicsView is a class with scrolled graph window...

Graphics in PyQt4

Code Block
...
        self.poi1  = QtCore.QPoint(0,0)
        self.poi2  = QtCore.QPoint(0,0)
        self.rect1 = QtCore.QRect()
        self.rect2 = QtCore.QRect()

        self.pen1 = QtGui.QPen(QtCore.Qt.black) 
        self.pen2 = QtGui.QPen(QtCore.Qt.white) 
        self.pen1.setStyle(QtCore.Qt.DashLine) 
        self.pen2.setStyle(QtCore.Qt.DashLine) 
        self.pen1.setWidthF(1) 
        self.pen2.setWidthF(1)
...

     def paintEvent(self, e):
        super(GUIImage,self).paintEvent(e)
        qp = QtGui.QPainter()
        # or QPainter can be defined earlier and use it as   qp = self.qp
        qp.begin(self)
        #self.drawPixmap(qp)
        self.drawRect(qp)
        qp.end()
        self.update()

    def setPen(self, qp):
        self.pen.setStyle(QtCore.Qt.DashLine) 
        self.pen.setWidthF(1) 

    def drawRect(self, qp):
        if self.r_pixmap == None:
            return

        p1x, p1y = self.poi1.x(), self.poi1.y()
        p2x, p2y = self.poi2.x(), self.poi2.y()

        R=1
        if abs(p2x-p1x) < R : return
        if abs(p2y-p1y) < R : return

        self.rect1.setCoords( p1x,   p1y,   p2x,   p2y)
        self.rect2.setCoords( p1x+1, p1y+1, p2x-1, p2y-1)
        qp.setPen  (self.pen1)
        qp.drawRect(self.rect1);
        qp.setPen  (self.pen2)
        qp.drawRect(self.rect2);


    def drawPixmap(self, qp):
        if self.r_pixmap != None:
            qp.drawPixmap(0,0,self.s_pixmap)

...

Code Block
fig.clear()

Graphic

Code Block
import pyimgalgos.Graphics as gr
axes.clear()
axes.plot(xarr1, yarr1, '-r', xarr2, yarr2,  '-g')
gr.show(mode='do_not_hold') 

Histogram

Code Block
axes.clear()
axes.hist(arr, bins=100, range=(10,50), log=False) # log for vertical scale only

Image (with colorbar)

Code Block
img = axes.imshow(arr2d, interpolation='nearest', origin='bottom', aspect='auto')
img.set_clim(Amin,Amax)

cbar = self.fig.colorbar(img, orientation='vertical', \
                         fraction=0.1, pad=0.01, shrink=1.0, aspect=20)

        # fraction - of the 2d plot occupied by the color bar
        # pad      - is a space between 2d image and color bar
        # shrink   - factor for the length of the color bar
        # aspect   - ratio length/width of the color bar

...

Code Block
#!/usr/bin/env python
  import numpy as np

...

Load numpy array from text file

Code Block
    nparr = np.loadtxt('arr.txt', dtype=np.float)

Load numpy array from *.npy file

Code Block
    nparr = np.load('arr.npy')

errors = 0.5*np.random.normal(size=len(yn))

...

Other supported formats: gif, pdf, png, jpeg, eps

 

eps

Check tiff file

To check tiff file format one may use command:

% identify -verbose <file-name>.tiff

Save image in 16-bit TIFF file

...

Code Block
V = np.array(...)
Vmin, Vmax, Nbins1 <--- scalar valuer
indarr = np.int32( factor * (V-Vmin) )
arr = np.select([V==Vmax, indarr<0, indarr>Nbins1], [Nbins1, 0, 0], default=indarr)

protected division:

Code Block
def divideZeroProteced(nda_num, Vmax, Nbins1 <--- scalar valuer
indarr nda_den, val_subst_zero=0) :
    pro_num = np.int32( factor * (V-Vmin) )
arrselect([nda_den==0], [val_subst_zero], default=nda_num)
    pro_den = np.select([Vnda_den==Vmax0], indarr<0, indarr>Nbins1], [Nbins1, 0, 0], default=indarr)[1],              default=nda_den)
    return pro_num / pro_den

 

SciPy

Import

Code Block
#!/usr/bin/env python
import numpy as np
from scipy.optimize import curve_fit

...