tkinter two optionmenu

Author: furas

tkinter/optionmenu/two optionmenu connected/README.md

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+It creates two `OptionMenu`. 
+
+When you select element in first `OptionMenu` then it changes items in second `OptionMenu` 

tkinter/optionmenu/two optionmenu connected/main.py

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+#!/usr/bin/env python3
+
+import tkinter as tk
+
+def cap_filter(selection):
+    options = {
+        'Arm': ['50kg', '100kg', '200kg', '300kg'],
+        'Arm (Food Grade)': ['75kg'],
+        'Rail': ['125kg', '300kg'],
+        'Drive': ['125kg', '300kg'],
+    }
+
+    print(options[selection])
+
+    # remove old elements
+    cap_dropdown['menu'].delete(0, 'end')
+    
+    # add new items
+    for text in options[selection]:
+        cap_dropdown['menu'].add_command(label=text, command=lambda arg=text:length_filter(arg))
+
+def length_filter(selection):
+    type_ = lift_type.get()
+    
+    if selection == '50kg' and type_ == 'Arm':
+        length_choice = ['3m']
+    elif selection == '75kg':
+        length_choice = ['4.2m']
+    elif selection == '100kg' and type_ == 'Arm':
+        length_choice = ['3m', '4m', '5m']
+    elif selection == '125kg':
+        length_choice = ['N/A']
+    elif selection == '200kg' and type_ == 'Arm':
+        length_choice = ['3m', '4m', '5m']
+    elif selection == '300kg' and type_ == 'Arm':
+        length_choice = ['3m', '4m']
+    elif selection == '300kg' and type_ == 'Rail':
+        length_choice = ['N/A']
+    elif selection == '300kg' and type_ == 'Drive':
+        length_choice = ['N/A']
+    else:
+        length_choice = ['N/A']
+        
+    print(length_choice)
+
+app = tk.Tk()
+
+lift_type = tk.StringVar()
+lift_type.set('Lift Type')
+files = ['Arm', 'Arm (Food Grade)', 'Rail', 'Drive']
+
+lift_dropdown = tk.OptionMenu(app, lift_type, *files, command=cap_filter)
+lift_dropdown.pack()
+
+lift_cap = tk.StringVar()
+lift_cap.set('Capacity')
+cap_choice = ['']
+
+cap_dropdown = tk.OptionMenu(app, lift_cap, *cap_choice, command=length_filter)
+cap_dropdown.pack()
+
+app.mainloop()