Early stage of GUI program

Gui program with minimal code.

Author: martdev1963

Diff for: script1.py

@@ -0,0 +1,57 @@
+from tkinter import *
+#import tkinter as tk
+
+#window = tk.Tk() # this works
+
+# main window...All code goes in between these lines...window = Tk()  and window.mainloop()
+window = Tk() # this works too.
+
+# function that converts km to mi...
+def km_to_miles():
+    #print(e1_value.get()) # the get() method of the StringVar object...
+    miles=float(e1_value.get())*1.6
+    t1.insert(END,miles) # place this value after the last entry...
+
+# widgets (widgets go within the main window)
+b1=Button(window,text="Execute",command=km_to_miles) # parameters, separated by commas...You just pass the function name without the function()
+#b1.pack()
+# alternative way for .pack()
+b1.grid(row=0,column=0)
+
+e1_value=StringVar() # instantiate a StringVar object...
+e1=Entry(window,textvariable=e1_value) # e1_value for the user input...
+e1.grid(row=0,column=1)
+
+t1=Text(window,height=1,width=20)
+t1.grid(row=0,column=2)
+
+
+
+
+window.mainloop() # all code goes before this line...
+
+
+
+
+"""
+OUTPUT:
+miles=e1_value.get()*1.6
+TypeError: can't multiply sequence by non-int of type 'float'...solution: miles=float(e1_value.get())*1.6...convert user input string to float...
+"""
+
+
+"""
+Traceback (most recent call last):
+  File "script1.py", line 2, in <module>
+    import Tkinter as tk
+ModuleNotFoundError: No module named 'Tkinter'
+
+for code interspection, do this:
+
+invoke the python interactive shell...
+    ipython
+
+from tkinter import *
+
+Button?
+"""