GUI Tk Python

from Tkinter import *
fields = 'First Name', 'Last Name', 'Job'
def fetch(entries):
    for entry in entries:
        print 'Input => "%s"' % entry.get()
def makeform(root, fields):
    entries = []
    for field in fields:
        row = Frame(root)                  
        lab = Label(row, width=5, text=field)
        ent = Entry(row)
        row.pack(side=TOP, fill=X)           
        lab.pack(side=LEFT)
        ent.pack(side=RIGHT, expand=YES, fill=X)
        entries.append(ent)
    return entries
def show(entries):
    fetch(entries)
    popup.destroy()
def ask():
    global popup
    popup = Toplevel()
    ents = makeform(popup, fields)
    Button(popup, text='OK', command=(lambda e=ents: show(e)) ).pack()
    popup.grab_set()
    popup.focus_set()
    popup.wait_window()
root = Tk()
Button(root, text='Dialog', command=ask).pack()
root.mainloop()