I want to make an interactive tutorial for special textdocuments. I would like to be able to insert text by the program and also have the user to add something.

I would like to have the text appear char by char. I tried this, but it just blocks the window from appearing completely, until the text is written out

import sys
import time
from PyQt5 import QtWidgets as qtw

Qt Code: 
  1. class Text_Script(qtw.QTextEdit):
  2.     def __init__(self):
  3.         super().__init__()
  4.  
  5.     def write_intro(self):
  6.         welcome_string = "Welcome!"
  7.         for i in range(0, len(welcome_string)):
  8.             time.sleep(0.2)
  9.             self.insertPlainText(welcome_string[i])
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calling in the main window
Qt Code: 
  1. import sys
  2. from Text_Script import Text_Script
  3. from PyQt5 import QtWidgets as qtw
  4.  
  5.  
  6. class Lastenheft(qtw.QWidget):
  7.     def __init__(self):
  8.         super().__init__()
  9.         self.init_me()
  10.  
  11.     def init_me(self):
  12.         self.setLayout(qtw.QVBoxLayout())
  13.         self.text_script = Text_Script()
  14.         self.next_btn = qtw.QPushButton("Next")
  15.         self.layout().addWidget(self.text_script)
  16.         self.layout().addWidget(self.next_btn)
  17.         self.showMaximized()
  18.         self.text_script.write_intro()
  19.  
  20. if __name__ == '__main__':
  21.     app = qtw.QApplication(sys.argv)
  22.     mw = Lastenheft()
  23.     sys.exit(app.exec())
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Is there a way to achieve this?