How to convert abc.ui into abc.py

[snippsat]

Save FirstApp.ui in folder where pyuic5.exe is placed PyQt5\Scripts folder.
Then from Scripts folder run same command.

You can also load ui file straight in,then is no need to convert.

from PyQt5 import uic, QtWidgets
import sys

class Ui(QtWidgets.QDialog):
    def __init__(self):
        super().__init__()
        uic.loadUi('FirstApp.ui', self)
        self.show()

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    window = Ui()
    sys.exit(app.exec_())