<code Python>
import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

class Window (QMainWindow) :

    def __init__ (self) :
        super().__init__ ()

        self.widget = QWidget (self)

        self.layout = QVBoxLayout (self.widget)

        self.setCentralWidget (self.widget)

        # self.setFont (QFont ("", 20))

        self.tree = QTreeWidget (self)
        self.tree.header().setVisible (False)
        self.layout.addWidget (self.tree)

        self.button = QPushButton (self)
        self.button.setText ("Add Items")
        self.button.clicked.connect (self.onClick)

        self.layout.addWidget (self.button)

    def onClick (self) :

        branch = QTreeWidgetItem (self.tree)
        branch.setText (0, "abc")
        branch.setForeground (0, QColor ("brown"))
        branch.setExpanded (True)

        colors = [ "red", "blue", "green", "yellow", "orange"]
        for name in colors :
           item = QTreeWidgetItem (branch)
           item.setText (0, name + " item")
           item.setForeground (0, QColor (name))

if __name__ == "__main__" :
    app = QApplication (sys.argv)
    win = Window ()
    win.show ()
    win.raise_ ()
    sys.exit (app.exec_ ())
</code>

{{tree.png}}

<code Python>
import sys, os
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
 
class Window (QMainWindow) :
 
    def __init__ (self) :
        super().__init__ ()
        
        self.widget = QWidget (self)
        
        self.layout = QVBoxLayout (self.widget)

        self.setCentralWidget (self.widget)
        
        self.setFont (QFont ("", 20))
       
        self.tree = QTreeWidget (self)
        self.tree.header().setVisible (False)
        self.layout.addWidget (self.tree)
        
        self.checkbox = QCheckBox (self)
        self.checkbox.setText ("Check Box")

        self.layout.addWidget (self.checkbox)

        self.lineedit = QLineEdit (self)
        self.lineedit.setText ("Line Edit")

        self.layout.addWidget (self.lineedit)
        
        self.button = QPushButton (self)
        self.button.setText ("Knoflik")
        self.button.clicked.connect (self.onClick)
        
        self.layout.addWidget (self.button)
        
        self.output = QTextEdit (self)
        self.output.setText ("Text Edit")

        self.layout.addWidget (self.output)
        
    def onClick (self) :
        self.button.setText ("Click")
        
        self.output.append ( "checbox ..."  + str ( self.checkbox.isChecked () ))
        self.output.append ( "lineedit ..." + str ( self.lineedit.text ()      ))
        # os.system (self.lineedit.text ())
        
        branch = QTreeWidgetItem (self.tree)
        branch.setText (0, "abc")
        branch.setForeground (0, QColor ("brown"))
        branch.setExpanded (True)
    
        colors = [ "red", "blue", "green", "yellow", "orange"]
        for name in colors :
           item = QTreeWidgetItem (branch)
           item.setText (0, name + " item")
           item.setForeground (0, QColor (name))
         
def main () :
    app = QApplication (sys.argv)
    # i = "abc"
    # i = i + str (1)
    # win = None
    win = Window ()
    win.show ()
    win.raise_ ()
    # win.setWindowTitle(i)
    sys.exit (app.exec_ ())
 
if __name__ == "__main__" :
    main ()


"""
use_glob = True
try :
   from glob import *
   # import glob
except :
   use_glob = False

for name in glob ("c:\\temp\\*.zip") :
    print (name)
"""    


"""
a = [ 10, 20, 30 ]

# a = [ ] 

print ("pocet prvku", len (a))

for i in range (len (a)) :
    print ("prvek", i, "je", a[i])

def fact (n) :
    if n == 1 :
       return n * fact (n-1)
    else :
       return 1

def fact2 (n) :
    v = 1
    while n > 1 :
        v *= n
        n -= 1
    return v

print ("faktorial je", fact2 (5))
"""

"""
for v in a :
    # print (v)
    if v > 25 :
       print (v, " je prilis velke")
    elif v < 15 :
       print (v, " je prilis male")
    else :
       print (v, " je prijatelne")

    if v > 25 :
       print (v, " je prilis velke")
    else :
       if v < 15 :
          print (v, " je prilis male")
       else :
          print (v, " je prijatelne")
"""
</code>