adds replay to guess the number gui

learning_python3_gui.md

@@ -326,6 +326,82 @@ if __name__ == "__main__":
 ```
 </details>
 
+<details>
+<summary>With replay function</summary>
+
+```python
+import tkinter as tk
+import random
+
+
+class Application(tk.Tk):
+    def __init__(self):
+        tk.Tk.__init__(self)
+        self.title("hello world")
+        self.geometry("500x400")
+        self.resizable(0, 0)
+
+        self.header = tk.Label(text="I have a number in mind...")
+        self.header.grid(column=0, row=0, sticky=tk.W)
+
+        self.question = tk.Label(self, text="What's your guess?")
+        self.question.grid(column=0, row=1, sticky=tk.W)
+
+        self.input = tk.Entry(self)
+        self.input.grid(column=1, row=1, sticky=tk.W)
+
+        self.button = tk.Button(self, text="check", command=self.clicked)
+        self.button.grid(column=0, row=2, sticky=tk.W)
+
+        self.output = tk.Label(self, text="...")
+        self.output.grid(column=1, row=2, sticky=tk.W)
+
+        self.init_new_game()
+
+    def _is_entry_digit(self):
+        number = self.input.get()
+        if number.isdigit():
+            number = int(number)
+            return number
+
+    def compare_numbers(self):
+        number = self._is_entry_digit()
+        if not number:
+            msg = "numbers please..."
+        else:
+            if number < self.number:
+                msg = "my number is bigger"
+            elif number > self.number:
+                msg = "my number is smaller"
+            elif number == self.number:
+                msg = "bingo!"
+                self.won = True
+                self.button.config(text="play again!")
+        self.output.config(text=msg)
+
+    def init_new_game(self):
+        self.won = False
+        self.number = random.randint(0, 100)
+        print(self.number)
+        self.button.config(text="check")
+        self.output.config(text="")
+        self.input.delete(0, 'end')
+
+    def clicked(self):
+        if self.won:
+            self.init_new_game()
+        else:
+            self.compare_numbers()
+
+
+if __name__ == "__main__":
+    app = Application()
+    app.mainloop()
+
+```
+
+</detail>
+
 ## MVC design pattern
 
 A simple console only MVC.