Untitled

from PyQt5.QtWidgets import (QApplication, QComboBox, QDialog,
        QDialogButtonBox, QFormLayout, QGridLayout, QGroupBox, QHBoxLayout,
        QLabel, QLineEdit, QMenu, QMenuBar, QPushButton, QSpinBox, QTextEdit,
        QVBoxLayout)
 
import sys
 
class Dialog(QDialog):

    def __init__(self):
        super(Dialog, self).__init__()   
        global layout
        layout = QVBoxLayout()   
        button=QPushButton("Click", self)
        button.move(50, 50)
        button.clicked.connect(self.sloter)
        self.show()
 
    def sloter(self):
        global button2
        self.button2 = QPushButton("Clicker", self)
        self.button2.move(70, 70)
        layout.addWidget(self.button2)
        self.show()
 

 
if __name__ == '__main__':
    app = QApplication(sys.argv)
    dialog = Dialog()
sys.exit(dialog.exec_())