cpython/Demo/tkinter/matt/entry-with-shared-variable.py
Georg Brandl f55aa80b37 Merged revisions 85820,85823,85825,85840,85843-85845,85849-85851,85855,85867,85875,85907-85908,85911,85914 via svnmerge from
svn+ssh://svn.python.org/python/branches/py3k

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  r85820 | georg.brandl | 2010-10-24 16:20:22 +0200 (So, 24 Okt 2010) | 1 line

  Remove usage of exception indexing.
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  r85823 | georg.brandl | 2010-10-24 16:32:45 +0200 (So, 24 Okt 2010) | 1 line

  Fix style.
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  r85825 | georg.brandl | 2010-10-24 17:16:02 +0200 (So, 24 Okt 2010) | 1 line

  Add documentation about the default warnings filters.
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  r85840 | georg.brandl | 2010-10-25 19:50:20 +0200 (Mo, 25 Okt 2010) | 1 line

  #3018: tkinter demo fixes for py3k.
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  r85843 | georg.brandl | 2010-10-26 08:59:23 +0200 (Di, 26 Okt 2010) | 1 line

  Markup fix.
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  r85844 | georg.brandl | 2010-10-26 12:39:14 +0200 (Di, 26 Okt 2010) | 1 line

  Work a bit more on tkinter demos.
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  r85845 | georg.brandl | 2010-10-26 12:42:16 +0200 (Di, 26 Okt 2010) | 1 line

  faqwiz is removed.
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  r85849 | georg.brandl | 2010-10-26 21:31:06 +0200 (Di, 26 Okt 2010) | 1 line

  #10200: typo.
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  r85850 | georg.brandl | 2010-10-26 21:58:11 +0200 (Di, 26 Okt 2010) | 1 line

  #10200: typo.
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  r85851 | georg.brandl | 2010-10-26 22:12:37 +0200 (Di, 26 Okt 2010) | 1 line

  Fix import.
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  r85855 | georg.brandl | 2010-10-27 09:21:54 +0200 (Mi, 27 Okt 2010) | 1 line

  Encoding fix.
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  r85867 | georg.brandl | 2010-10-27 22:01:51 +0200 (Mi, 27 Okt 2010) | 1 line

  Add David.
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  r85875 | georg.brandl | 2010-10-28 10:38:30 +0200 (Do, 28 Okt 2010) | 1 line

  Fix bytes/str issues in get-remote-certificate.py.
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  r85907 | georg.brandl | 2010-10-29 06:54:13 +0200 (Fr, 29 Okt 2010) | 1 line

  #10222: fix for overzealous AIX compiler.
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  r85908 | georg.brandl | 2010-10-29 07:22:17 +0200 (Fr, 29 Okt 2010) | 1 line

  send_bytes obviously needs bytes...
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  r85911 | georg.brandl | 2010-10-29 07:36:28 +0200 (Fr, 29 Okt 2010) | 1 line

  Fix markup error and update false positive entries from "make suspicious".
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  r85914 | georg.brandl | 2010-10-29 08:17:38 +0200 (Fr, 29 Okt 2010) | 1 line

  (?:...) is a non-capturing, but still grouping construct.
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2010-11-26 08:59:40 +00:00

45 lines
1.7 KiB
Python

from tkinter import *
# This program shows how to make a typein box shadow a program variable.
class App(Frame):
def __init__(self, master=None):
Frame.__init__(self, master)
self.pack()
self.entrythingy = Entry(self)
self.entrythingy.pack()
self.button = Button(self, text="Uppercase The Entry",
command=self.upper)
self.button.pack()
# here we have the text in the entry widget tied to a variable.
# changes in the variable are echoed in the widget and vice versa.
# Very handy.
# there are other Variable types. See Tkinter.py for all
# the other variable types that can be shadowed
self.contents = StringVar()
self.contents.set("this is a variable")
self.entrythingy.config(textvariable=self.contents)
# and here we get a callback when the user hits return. we could
# make the key that triggers the callback anything we wanted to.
# other typical options might be <Key-Tab> or <Key> (for anything)
self.entrythingy.bind('<Key-Return>', self.print_contents)
def upper(self):
# notice here, we don't actually refer to the entry box.
# we just operate on the string variable and we
# because it's being looked at by the entry widget, changing
# the variable changes the entry widget display automatically.
# the strange get/set operators are clunky, true...
str = self.contents.get().upper()
self.contents.set(str)
def print_contents(self, event):
print("hi. contents of entry is now ---->", self.contents.get())
root = App()
root.master.title("Foo")
root.mainloop()