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    <p>Using the <a href="http://docs.python.org/2/reference/simple_stmts.html#the-global-statement" rel="nofollow noreferrer">global statement</a> is unnecessary in the two scenarios that come to mind. </p> <ol> <li>you want to code a dialog box that can be imported to use <strong>with</strong> a main GUI</li> <li>you want to code a dialog box that can be imported to use <strong>without</strong> a main GUI</li> </ol> <hr> <h1>code a dialog box that can be imported to use <strong>with</strong> a main GUI</h1> <hr> <p>Avoiding the global statement can be accomplished by passing a dictionary &amp; key when you create an instance of a dialog box. The dictionary &amp; key can then be associated with the button's command, by using <a href="https://docs.python.org/3.3/tutorial/controlflow.html?highlight=lambda#lambda-expressions" rel="nofollow noreferrer">lambda</a>. That creates an anonymous function that will execute your function call (with args) when the button is pressed.</p> <p>You can avoid the need to pass the parent every time you create an instance of the dialog box by binding the parent to a class attribute (root in this example). </p> <p>You can save the following as <code>mbox.py</code> in <code>your_python_folder\Lib\site-packages</code> or in the same folder as your main GUI's file.</p> <pre><code>import tkinter class Mbox(object): root = None def __init__(self, msg, dict_key=None): """ msg = &lt;str&gt; the message to be displayed dict_key = &lt;sequence&gt; (dictionary, key) to associate with user input (providing a sequence for dict_key creates an entry for user input) """ tki = tkinter self.top = tki.Toplevel(Mbox.root) frm = tki.Frame(self.top, borderwidth=4, relief='ridge') frm.pack(fill='both', expand=True) label = tki.Label(frm, text=msg) label.pack(padx=4, pady=4) caller_wants_an_entry = dict_key is not None if caller_wants_an_entry: self.entry = tki.Entry(frm) self.entry.pack(pady=4) b_submit = tki.Button(frm, text='Submit') b_submit['command'] = lambda: self.entry_to_dict(dict_key) b_submit.pack() b_cancel = tki.Button(frm, text='Cancel') b_cancel['command'] = self.top.destroy b_cancel.pack(padx=4, pady=4) def entry_to_dict(self, dict_key): data = self.entry.get() if data: d, key = dict_key d[key] = data self.top.destroy() </code></pre> <p>You can see examples that subclass TopLevel and tkSimpleDialog (tkinter.simpledialog in py3) at <a href="http://effbot.org/tkinterbook/tkinter-dialog-windows.htm" rel="nofollow noreferrer">effbot</a>.</p> <p>It's worth noting that <a href="https://stackoverflow.com/a/15081982/1217270">ttk widgets</a> are interchangeable with the tkinter widgets in this example.</p> <p>To accurately center the dialog box read → <a href="https://stackoverflow.com/a/10018670/1217270">this</a>.</p> <p>Example of use:</p> <pre><code>import tkinter import mbox root = tkinter.Tk() Mbox = mbox.Mbox Mbox.root = root D = {'user':'Bob'} b_login = tkinter.Button(root, text='Log in') b_login['command'] = lambda: Mbox('Name?', (D, 'user')) b_login.pack() b_loggedin = tkinter.Button(root, text='Current User') b_loggedin['command'] = lambda: Mbox(D['user']) b_loggedin.pack() root.mainloop() </code></pre> <hr> <h1>code a dialog box that can be imported to use <em>without</em> a main GUI</h1> <hr> <p>Create a module containing a dialog box class (MessageBox here). Also, include a function that creates an instance of that class, and finally returns the value of the button pressed (or data from an Entry widget).</p> <p>Here is a complete module that you can customize with the help of these references: <a href="http://infohost.nmt.edu/tcc/help/pubs/tkinter/web/index.html" rel="nofollow noreferrer">NMTech</a> &amp; <a href="http://effbot.org/tkinterbook/tkinter-index.htm" rel="nofollow noreferrer">Effbot</a>.<br> Save the following code as <code>mbox.py</code> in <code>your_python_folder\Lib\site-packages</code></p> <pre><code>import tkinter class MessageBox(object): def __init__(self, msg, b1, b2, frame, t, entry): root = self.root = tkinter.Tk() root.title('Message') self.msg = str(msg) # ctrl+c to copy self.msg root.bind('&lt;Control-c&gt;', func=self.to_clip) # remove the outer frame if frame=False if not frame: root.overrideredirect(True) # default values for the buttons to return self.b1_return = True self.b2_return = False # if b1 or b2 is a tuple unpack into the button text &amp; return value if isinstance(b1, tuple): b1, self.b1_return = b1 if isinstance(b2, tuple): b2, self.b2_return = b2 # main frame frm_1 = tkinter.Frame(root) frm_1.pack(ipadx=2, ipady=2) # the message message = tkinter.Label(frm_1, text=self.msg) message.pack(padx=8, pady=8) # if entry=True create and set focus if entry: self.entry = tkinter.Entry(frm_1) self.entry.pack() self.entry.focus_set() # button frame frm_2 = tkinter.Frame(frm_1) frm_2.pack(padx=4, pady=4) # buttons btn_1 = tkinter.Button(frm_2, width=8, text=b1) btn_1['command'] = self.b1_action btn_1.pack(side='left') if not entry: btn_1.focus_set() btn_2 = tkinter.Button(frm_2, width=8, text=b2) btn_2['command'] = self.b2_action btn_2.pack(side='left') # the enter button will trigger the focused button's action btn_1.bind('&lt;KeyPress-Return&gt;', func=self.b1_action) btn_2.bind('&lt;KeyPress-Return&gt;', func=self.b2_action) # roughly center the box on screen # for accuracy see: https://stackoverflow.com/a/10018670/1217270 root.update_idletasks() xp = (root.winfo_screenwidth() // 2) - (root.winfo_width() // 2) yp = (root.winfo_screenheight() // 2) - (root.winfo_height() // 2) geom = (root.winfo_width(), root.winfo_height(), xp, yp) root.geometry('{0}x{1}+{2}+{3}'.format(*geom)) # call self.close_mod when the close button is pressed root.protocol("WM_DELETE_WINDOW", self.close_mod) # a trick to activate the window (on windows 7) root.deiconify() # if t is specified: call time_out after t seconds if t: root.after(int(t*1000), func=self.time_out) def b1_action(self, event=None): try: x = self.entry.get() except AttributeError: self.returning = self.b1_return self.root.quit() else: if x: self.returning = x self.root.quit() def b2_action(self, event=None): self.returning = self.b2_return self.root.quit() # remove this function and the call to protocol # then the close button will act normally def close_mod(self): pass def time_out(self): try: x = self.entry.get() except AttributeError: self.returning = None else: self.returning = x finally: self.root.quit() def to_clip(self, event=None): self.root.clipboard_clear() self.root.clipboard_append(self.msg) </code></pre> <p>and: </p> <pre><code>def mbox(msg, b1='OK', b2='Cancel', frame=True, t=False, entry=False): """Create an instance of MessageBox, and get data back from the user. msg = string to be displayed b1 = text for left button, or a tuple (&lt;text for button&gt;, &lt;to return on press&gt;) b2 = text for right button, or a tuple (&lt;text for button&gt;, &lt;to return on press&gt;) frame = include a standard outerframe: True or False t = time in seconds (int or float) until the msgbox automatically closes entry = include an entry widget that will have its contents returned: True or False """ msgbox = MessageBox(msg, b1, b2, frame, t, entry) msgbox.root.mainloop() # the function pauses here until the mainloop is quit msgbox.root.destroy() return msgbox.returning </code></pre> <p>After <em>mbox</em> creates an instance of <em>MessageBox</em> it starts the mainloop,<br> which effectively stops the function there until the mainloop is exited via <code>root.quit()</code>.<br> The <em>mbox</em> function can then access <code>msgbox.returning</code>, and return its value. </p> <p>Example:</p> <pre><code>user = {} mbox('starting in 1 second...', t=1) user['name'] = mbox('name?', entry=True) if user['name']: user['sex'] = mbox('male or female?', ('male', 'm'), ('female', 'f')) mbox(user, frame=False) </code></pre>
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