followed brief tutorial

tkinter tutorial/tkinter unit converter.py

@@ -0,0 +1,67 @@
+from tkinter import *
+from tkinter import ttk
+
+root = Tk()
+root.title("Distance conversion")
+
+factors = { #all values are m / x
+    "m" : 1,
+    "cm" : 0.01,
+    "mm" : 0.001,
+    "km" : 1000,
+    "au" : 1.496e11,
+    "ly" : 9.461e15,
+    "pc" : 3.086e16,
+    "ft" : 0.3048,
+    "yd" : 0.9144,
+    "in" : 0.0254
+}
+
+def calculate(*args):
+    try:
+        value = float(entry.get())
+        destUnit = 1/factors[destUnitString.get()]
+        srcUnit = factors[srcUnitString.get()]
+        factor = srcUnit*destUnit
+        out.set(round(value*factor, 4))
+    except ValueError:
+        pass
+
+bg = PhotoImage(file="M:\Pictures\hk stream\hornet siitt.png")
+im = ttk.Label(root, image=bg)
+im.grid(column=0,row=1)
+
+mainframe = ttk.Frame(root, padding=(5,15,5,15))
+mainframe.grid(column=0, row=0, sticky=(N,W,E,S))
+
+entry = StringVar()
+entryBox = ttk.Entry(mainframe, width=8, textvariable=entry)
+entryBox.grid(column=2,row=1, sticky=(W,E))
+
+out = StringVar()
+ttk.Label(mainframe, textvariable=out).grid(column=2, row=2, sticky=(W,E))
+
+calcButton = ttk.Button(mainframe, text="Convert", command=calculate)
+calcButton.grid(column=3, row=3, sticky=W)
+
+srcUnitString = StringVar()
+srcUnitString.set("ft")
+srcUnitEntry = ttk.Combobox(mainframe, textvariable=(srcUnitString), values=list(factors.keys()), state="readonly")
+srcUnitEntry.grid(column=3, row=1, sticky=W)
+
+ttk.Label(mainframe, text="is equivalent to").grid(column=1, row=2, sticky=E)
+
+destUnitString = StringVar()
+destUnitString.set("m")
+destUnitEntry = ttk.Combobox(mainframe, textvariable=destUnitString, values=list(factors.keys()), state="readonly")
+destUnitEntry.grid(column=3, row=2, sticky=W)
+
+root.columnconfigure(0, weight=1)
+root.rowconfigure(0, weight=1)	
+mainframe.columnconfigure(2, weight=1)
+for child in mainframe.winfo_children(): 
+    child.grid_configure(padx=5, pady=5)
+entryBox.focus()
+root.bind("<Return>", lambda e: calcButton.invoke())
+
+root.mainloop()