builtin_icon.py

from PySide2.QtWidgets import *
from PySide2.QtGui import *
import base64

# icon base64 encoded data
ico_encoded = b'iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJ\nbWFnZVJlYWR5ccllPAAAAyZpVF' \
              b'h0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdp\nbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+' \
              b'IDx4OnhtcG1ldGEgeG1sbnM6\neD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNi1jMTM4IDc5LjE1\n' \
              b'OTgyNCwgMjAxNi8wOS8xNC0wMTowOTowMSAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJo\ndHRwOi8vd3d3LnczLm9yZy8xOT' \
              b'k5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlw\ndGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wPSJodHRwOi8vbnMu' \
              b'YWRvYmUuY29tL3hhcC8xLjAv\nIiB4bWxuczp4bXBNTT0iaHR0cDovL25zLmFkb2JlLmNvbS94YXAvMS4wL21tLyIgeG1sbnM6c3RS\n' \
              b'ZWY9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9zVHlwZS9SZXNvdXJjZVJlZiMiIHhtcDpD\ncmVhdG9yVG9vbD0iQWRvYmUgUG' \
              b'hvdG9zaG9wIENDIDIwMTcgKFdpbmRvd3MpIiB4bXBNTTpJbnN0\nYW5jZUlEPSJ4bXAuaWlkOjdFMkE5RkQ2QUZDQTExRUFBM0U4QUZC' \
              b'NjA0MzU1NDJBIiB4bXBNTTpE\nb2N1bWVudElEPSJ4bXAuZGlkOjdFMkE5RkQ3QUZDQTExRUFBM0U4QUZCNjA0MzU1NDJBIj4gPHht\n' \
              b'cE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6N0UyQTlGRDRBRkNBMTFF\nQUEzRThBRkI2MDQzNTU0MkEiIH' \
              b'N0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6N0UyQTlGRDVBRkNB\nMTFFQUEzRThBRkI2MDQzNTU0MkEiLz4gPC9yZGY6RGVzY3JpcHRp' \
              b'b24+IDwvcmRmOlJERj4gPC94\nOnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz4ozi3YAAAHKklEQVR42rxXCWwUVRj+ZnZm7y29\n' \
              b'oBRaaKGlHEUwCOJBEAzIYdQEVNCYqAHPRCIEFBW8wFDPxGiCICaEEOVSEoIHRkVNMUUDCAVSaEsp\nWErvY7v37vi9Nyzbk0MSX/J2Zm' \
              b'fe/P/3/v/7j6cYhoFeR/A80PwToLoALYkPFCBwfjgCFbfDXzkO\nHUfyEKwdABgKbBn1cN1cDnvOUc4DcI05hVgYCNXwOwuQcidgy+pV' \
              b'jYY+B4FZ+ZFBQU0/LkDLr0/D\nW3oXwn75CprK6TKXek8DLWUSI3Qb4B5XjKTbP0Pq1C3QBuBKQ+nTAmJUrZ2G2i0for1svPwvhKu2\n' \
              b'KwqEEeLOAyZIz/ATyHxiGXJe/f46AUSBitVrUP7Oq+BGYfPwRzWtck1DMdeG2oAIb4e/+BHy1i2F\nYr1GAIem7UTN/nlw2+lCTiOG/z' \
              b'QUgo7SGl7Ogbd+j1uKZ0tOdBrqZX/HR+m8HbhA5R6Xae7/qlyK\njZkyktzAxZJZODLnuy4ckwCCFyCnGGfffgVVX8+Hm8oVLQFMXHT+' \
              b'OGJ9e0I8s/DHyTWa0WmNYUaC\nhyDO75uFyhVFZpTVSr2K4SODbdlA2x8jUDKtDLpOAc6Elij92Z/ECqoItGiwZ/LeS4EdFlOhGBGu\n' \
              b'SaazrTH4L9jgGBAynzfqJpg4L4Q7gkFg4t4JSJ15CIEq7odhjBgfVrz0lblTV0K5sD6FHTvmxoyl\n+ZjI+eanWYI5pjXiG+wXgbddw9' \
              b'NrcnHrsjw8/Now1NbQ9GnhrpbQHCY/K1dsQ6RdWkaFngI07LkN\nDQdvhsPR1eeuKDqadDz5wRDsL3XBF1LxxqZMrN/F2E4LJVjkjOL1' \
              b'LzKxYXc6/LTG9l9SsOSTLBhx\n13XmhIMbbDyeh/od9wjdKhRCqt/+skTaPcbpz6pyByouWjEuN4A0dxTulAiKyygkrJjKdQpt1lFy\n' \
              b'2oGsrCCSXTEU5ARwtNpOF1OerTuJdfNSt2MljChFdJQ60PrbHFiVnoynn3NH+DByUBCHKh2oa9Xg\nbdYwtdBryhHLw0SRGsaUUT6cP2' \
              b'dHY7sFZWccmJDrh20wXRtQuwHgRzbyp+3AVHgPp2jwV0yW7NJd\nPZntU+FMi2DzirNYvnEwqut1vPB8PRY9UE+36QmekJSrn6hBhPc/' \
              b'H/Fg+twGFC2ugRK9RFClm1wL\nXR3gJnzlU7ilo+OlEMXSE4AAT0X5BT7sXlcOgxZQMuh7XuXORBQI4W0aHCTieyuqEa21wiKiRihu\n' \
              b'6hwFXRCY37UfHKuhZV8e9CvUJKFEhBPJpNiJtN5q7trSSbBQIkLTb4GFxJUABQDN6LvQiXBv/T1b\ng+9cijTJ1VK7EBhREv97WyOAxX' \
              b'2uXCVLqtQZrPOoULXoDaXbG0rTlpgK9+g6RH3/P4AY+wr7kGYV\nyXeXIWL8z9rpnzC5kjy9SoUj/09ZIY1Qz+KimNnwulqB+LfiG3sf' \
              b'rhVdlnjvKvxLZf92GI7BrQgH\neoRgjKRrY+wjOWym1Ng1KhcRwm+izCO99zvC/Mzl7sI/aIECZrLZWxEWO+5EXaL3EsDIZ0bi/U2D\n' \
              b'AKZipLLixa5Ab/GO+QB5fqzfOhD5T42Cl/XjcuGKNylBokqZuQOuscyj0VYgY0GRTK0C2eWuWIGH\nlXDtohos/zgbDy8eiRYmTAz3yQ' \
              b'opCpAov3KK+/5h+c7ns+Dx5wvwbNFQLJlfB5cs5Z1AxwJmU5Sx\ncC0iHSysHaeIMAc4+dhWVG17BJ5+kHaL+3EIC8vBJDz4ei5qGqx4' \
              b'dFYjHprSgpv4PF3wQ5R9Ki1l\nHdhZ3A9bvk1DSlIU21afwSSuA5+LFlPySVi4nRvOnrsXhd/cC/9Z0ZAQgJbOJNPsQElhG9tudh3J\n' \
              b'ZpwKEKJfyAzKxmTzN/2xfk86zjE969y5UzdTsT+kIERTD2JRWjSnEU9x57DxXY01kZSk6VvM6+Sj\nqWyCmhG+SAChBoiyCCtrfOOemS' \
              b'i57wfYaWrdnaiOwreirApzUlHDWTuOn7GzOFmlsbLTwxjN6pfB\nMox4uhYZUTUSfo/QdT5+P/HL+RiwYBdC9fJ5z6743LvLcOyl92Gn' \
              b'o3RP1xJtJBoQSSztUjESvYFf\nlbXgsrk7ky4iKh/JOWbVG8h5682rt+WVK5fi9LoPJFlsyTfWlododpFihi1ehYINa65+LhBREeaB\n' \
              b'omnvbJSv2gx/Q39Y6RKL6/oOJiLVBqnZ6mzFmE1P0uxfy2TX7XDSE0CEnGj/m77MpdlOuvHP50Vo\n+uE5BP1m+GjieGbtpdyJREUF0a' \
              b'DpBp1rUmdswsCFy5HxaPO1H80ijSYAGYoxs0X3lg5By++L2ULd\nz5PxWNleixOTemk3UrF4xv/2YSeQNGEPPJM3wjO2QvrfOYIz/zoB' \
              b'CLaFG828bWFEWEjISJMTgepJ\n8J0oRGvxUAT/STWP54OakHRHNZyjjsOefRDWzHZE6HsxhaX63UbSDusVwL8CDABZcewQhBH1dwAA\n' \
              b'AABJRU5ErkJggg==\n'

# start app
app = QApplication([])
# create window
w = QMainWindow()
w.setWindowTitle('base64 icon') # title
# create pix map from base64
raw_data = base64.decodebytes(ico_encoded)
# create empty pixmap
icon = QPixmap()
# fill data
icon.loadFromData(raw_data, "PNG")
# set icon
w.setWindowIcon(QIcon(icon))
# show window
w.show()

app.exec_()