Rotating an image in PyQt5

 Code below slightly differs from [ 1 ] , which in turn references original idea proposed in [ 2 ] .  Code below provides ability to traverse the folders and select desired image.  Code in [ 1 ] requires the complete path to "jpeg" file to be submitted as command line argument.export

To suppress QT5 buggy warning add to .bashrc

export QT_LOGGING_RULES='*.debug=false;qt.qpa.*=false'

#!/usr/bin/python3

from PyQt5.QtGui import QPixmap, QImage, QTransform

from PyQt5.QtWidgets import QApplication, QWidget, QFileDialog

from PyQt5.QtWidgets import QLabel

from PyQt5.QtCore import Qt, QSize

class ImageRotate(QWidget):

    def __init__(self, image_path, parent=None):

        super().__init__(parent)

        self.label = QLabel(self)

        self.image = QImage(image_path)  

        self.angle = 0

        self.label.setAlignment(Qt.AlignCenter)  

        pm = QPixmap(self.image)

        self.resize(pm.width(), pm.height())  

        self.label.setPixmap(pm)

        self.setWindowTitle('PyQt5 Picture Rotation')

    def keyPressEvent(self, event):

        # on any key

        self.angle += 45 if event.key() == Qt.Key_Down else -45

        trs = QTransform().rotate(self.angle)

        self.label.setPixmap(QPixmap(self.image).transformed(trs))

        return super().keyPressEvent(event)

if __name__ == '__main__':

    import sys

    from  PyQt5.QtWidgets import QApplication, QFileDialog

    app = QApplication(sys.argv)

    qf = QFileDialog()

    fn = qf.getOpenFileName(None, 'Select file', '/',

        'All files (*);; Pictures (*.jpg *.png *.gif *.tif)')[0]

    w = ImageRotate(fn)

    w.move(app.desktop().screen().rect().center() - w.rect().center())

    w.show()

    sys.exit(app.exec_())