change script name to banana_survey.py

Author: alandmoore

Chapter01/banana_survey.py

@@ -0,0 +1,171 @@
+"""A banana preferences survey written in Python with Tkinter"""
+
+import tkinter as tk
+
+# Create the root window
+root = tk.Tk()
+
+# set the title
+root.title('Banana interest survey')
+
+# set the root window size
+root.geometry('640x480+300+300')
+root.resizable(False, False)
+
+###########
+# Widgets #
+###########
+
+# Use a Label to show the title
+# 'font' lets us set a font
+title = tk.Label(
+  root,
+  text='Please take the survey',
+  font=('Arial 16 bold'),
+  bg='brown',
+  fg='#FF0'
+)
+
+# Use an Entry to get a string
+name_label = tk.Label(root, text='What is your name?')
+name_inp = tk.Entry(root)
+
+# Use Checkbutton to get a boolean
+eater_inp = tk.Checkbutton(root, text='Check this box if you eat bananas')
+
+# Spinboxes are good for number entry
+num_label = tk.Label(root, text='How many bananas do you eat per day?')
+num_inp = tk.Spinbox(root, from_=0, increment=1, value=3)
+
+# Listbox is good for choices
+
+color_label = tk.Label(root, text='What is the best color for a banana?')
+color_inp = tk.Listbox(root, height=1)  # Only show selected item
+# add choices
+color_choices = (
+  'Any',
+  'Green',
+  'Green-Yellow',
+  'Yellow',
+  'Brown spotted',
+  'Black'
+)
+for choice in color_choices:
+  # END is a tkinter constant that means the end of an input
+  color_inp.insert(tk.END, choice)
+
+
+# RadioButtons are good for small choices
+
+plantain_label = tk.Label(root, text='Do you eat plantains?')
+# Use a Frame to keep widgets together
+plantain_frame = tk.Frame(root)
+plantain_yes_inp = tk.Radiobutton(plantain_frame, text='Yes')
+plantain_no_inp = tk.Radiobutton(plantain_frame, text='Ewww, no!')
+
+# The Text widget is good for long pieces of text
+banana_haiku_label = tk.Label(root, text='Write a haiku about bananas')
+banana_haiku_inp = tk.Text(root, height=3)
+
+# Buttons are used to trigger actions
+
+submit_btn = tk.Button(root, text='Submit Survey')
+
+# Use a label to display a line of output
+# 'anchor' sets where the text is stuck if the label is wider than needed.
+# 'justify' determines how multiple lines of text are aligned
+output_line = tk.Label(root, text='', anchor='w', justify='left')
+
+
+#######################
+# Geometry Management #
+#######################
+# Using Grid instead of pack
+# Put our widgets on the root window
+#title.grid()
+# columnspan allows the widget to span multiple columns
+title.grid(columnspan=2)
+
+# add name label and input
+# Column defaults to 0
+name_label.grid(row=1, column=0)
+
+# The grid automatically expands
+# when we add a widget to the next row or column
+name_inp.grid(row=1, column=1)
+
+# 'sticky' attaches the widget to the named sides,
+# so it will expand with the grid
+eater_inp.grid(row=2, columnspan=2, sticky='we')
+# tk constants can be used instead of strings
+num_label.grid(row=3, sticky=tk.W)
+num_inp.grid(row=3, column=1, sticky=(tk.W + tk.E))
+
+#padx and pady can still be used to add horizontal or vertical padding
+color_label.grid(row=4, columnspan=2, sticky=tk.W, pady=10)
+color_inp.grid(row=5, columnspan=2, sticky=tk.W + tk.E, padx=25)
+
+# We can still use pack on the plantain frame.
+# pack and grid can be mixed in a layout as long as we don't
+# use them in the same frame
+plantain_yes_inp.pack(side='left', fill='x', ipadx=10, ipady=5)
+plantain_no_inp.pack(side='left', fill='x', ipadx=10, ipady=5)
+plantain_label.grid(row=6, columnspan=2, sticky=tk.W)
+plantain_frame.grid(row=7, columnspan=2, stick=tk.W)
+
+# Sticky on all sides will allow the widget to fill vertical and horizontal
+banana_haiku_label.grid(row=8, sticky=tk.W)
+banana_haiku_inp.grid(row=9, columnspan=2, sticky='NSEW')
+
+# Add the button and output
+submit_btn.grid(row=99)
+output_line.grid(row=100, columnspan=2, sticky='NSEW')
+
+# columnconfigure can be used to set options on the columns of the grid
+# 'weight' means that column will be preferred for expansion
+root.columnconfigure(1, weight=1)
+
+# rowconfigure works for rows
+root.rowconfigure(99, weight=2)
+root.rowconfigure(100, weight=1)
+
+#####################
+# Add some behavior #
+#####################
+
+def on_submit():
+  """To be run when the user submits the form"""
+
+  # Many widgets use "get" to retrieve contents
+  name = name_inp.get()
+  # spinboxes return a str, not a float or int!
+  number = num_inp.get()
+  # Listboxes are more involved
+  selected_idx = color_inp.curselection()
+  if selected_idx:
+    color = color_inp.get(selected_idx)
+  else:
+    color = ''
+  # We're going to need some way to get our button values!
+  # banana_eater = ????
+
+  # Text widgets require a range
+  haiku = banana_haiku_inp.get('1.0', tk.END)
+
+  # Update the text in our output
+  message = (
+    f'Thanks for taking the survey, {name}.\n'
+    f'Enjoy your {number} {color} bananas!'
+    )
+  output_line.configure(text=message)
+  print(haiku)
+
+
+# configure the button to trigger submission
+submit_btn.configure(command=on_submit)
+
+###############
+# Execute App #
+###############
+
+root.mainloop()