Astrohas

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

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)

        button2 = QPushButton("Clicker", self)
        button2.move(50, 100)
        button2.hide()
        self.button2 = button2
        self.show()

    def sloter(self):
        self.button2.show()

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