Como fazer uma aplicação de processador de texto com python

Dicionários será muito útil. Isto é Python 3.7 mas funcionará bem em 2.7 mudando o tkinter para Tkinter e perdendo o ttk. Este exemplo são definições, mas você pode tê-lo convertido para o que você quiser.

1. from tkinter import * 
2. from tkinter import ttk 
3. words = {'acre': 'An English measurement for a Lot of land', 
4. 'aurora': 'A bright hue over the northern hemisphere', 
5. 'absolom': 'An Israelite King from the Bible', 
6. 'acrobat': 'Someone who performs dangerous stunts', 
7. 'aircraft': 'Man made things that fly', 
8. 'aristotle': 'Some old pencil pusher', 
9. 'ape': 'A bully', 
10. 'abba': 'A 1980 glamour band'} 
11.  
12. def calculate(*args): <
13. try: 
14. value = int(word.get())#CHECKS IF Word is a number ! 
15. word_out.set('Word must not be a number !') 
16. except ValueError: 
17. try: 
18. value = str(word.get()) 
19. value = words.get(value) 
20. if value == None:# CHECKS IF WORD NOT IN DICTIONARY 
21. word_out.set('Word not listed !') 
22. else: 
23. word_out.set(value+'.') 
24. except ValueError: 
25. pass 
26.  
27. root=Tk() 
28. width = root.winfo_screenwidth()# USE if using WINDOWS 
29. height = root.winfo_screenheight() 
30. #root.geometry(str(width) + "x" + str(height))# WINDOWS 
31. root.geometry('900x500') 
32. root.title("Word Processor") 
33. mainframe = ttk.Frame(root, padding="13 13 12 12") 
34. mainframe.grid(column=0, row=0, sticky=(N, W, E, S)) 
35. mainframe.columnconfigure(0, weight=1) 
36. mainframe.rowconfigure(0, weight=1) 
37.  
38. word = StringVar() 
39. word_out = StringVar() 
40.  
41. word_entry = ttk.Entry(mainframe, width=12, textvariable = word) 
42. word_entry.grid(column=1, row=0, sticky=(W, E)) 
43.  
44. ttk.Label(mainframe, textvariable = word_out).grid(column=1, row=2, sticky=(W, E)) 
45. ttk.Button(mainframe, text="Calculate", command=calculate).grid(column=2, row=0, sticky=W) 
46.  
47. ttk.Label(mainframe, text="Enter Word").grid(column=0, row=0, sticky=W) 
48. ttk.Label(mainframe, text="Definition:").grid(column=0, row=2, sticky=E) 
49. #ttk.Label(mainframe, text="Definition").grid(column=3, row=2, sticky=W) 
50.  
51. for child in mainframe.winfo_children(): child.grid_configure(padx=5, pady=5) 
52.  
53. word_entry.focus() 
54. root.bind('', calculate) 
55.  
56. root.mainloop() 

If your dictionaries get too large place them into separate .py files and import them as filename.function() and inside the function() place the dictionary and return it as named.

1. inside filename 
2. def funtioname(): 
3. words = {'words':'values',etc} 
4. return words 
5. -------------------------------------------- 
6. imp tkinter etc. then 
7. import filename 
8. inside calculate add and replace--> 
9.  
10. value = str(word.get()) 
11. lib = filename.functionname() 
12. value = lib.get(value) 
13.  
14. do the app