add view class

frontend/views/number.py

@@ -0,0 +1,9 @@
+from .base import View
+
+class NumberView(View):
+
+    def _init_canvas(self):
+        self.label = self.canvas.create_text(50, 68, text="0.0 g", font=("Arial", 18), fill='black', justify='left')
+    
+    def update_weight(self, weight):
+        self.canvas.itemconfig(self.label, text=f"{weight:.1f} g")