1 import cPickle
   2 
   3 
   4 def write_file():       
   5     """
   6     Funcao que escreve num arquivo um dicionario.
   7     Isto eh, escreve um arquivo binario de um objeto
   8     Python usando o Pickle
   9     """
  10     CIT = ["Academic Computer Skills", "Database Management", "Intro to Computer scince",\
  11         "ACCESS","Systems Analysis and Design", "Visual Basic",\
  12         "Intermediate Visual Basic", "Decision Support Using Excel"]
  13     pickle_file = open("pickles1.dat","w")
  14 
  15     cPickle.dump(CIT, pickle_file)
  16     print "A file has been created and the required specifications have been added"
  17     pickle_file.close()
  18 
  19 
  20 def read_file():
  21     """
  22     Le o dicionario do arquivo.
  23     """
  24     pickle_file = open("pickles1.dat","r")
  25     CIT = cPickle.load(pickle_file)
  26     pickle_file.close()
  27    
  28     for course in CIT:
  29         print CIT.index(course), "-", course
  30 
  31 
  32 def delete_file():
  33     """
  34     Deleta uma entrada do dicionario
  35     Tambem atualiza no arquivo.
  36     """
  37     word_delete = int(raw_input("Which record do u want to delete?[key of the record]: "))
  38    
  39     pickle_file = open("pickles1.dat", "r")
  40     CIT = cPickle.load(pickle_file)
  41     pickle_file.close()
  42    
  43     try:
  44         CIT.pop(word_delete)
  45         pickle_file = open("pickles1.dat","w")
  46         cPickle.dump(CIT, pickle_file)
  47         pickle_file.close()
  48     except:
  49         print "There isnt a record with this key"
  50 
  51 
  52 def add_record():
  53     """
  54     Adiciona um registro ao dicionario.
  55     Tambem atualiza o arquivo
  56     """
  57     pickle_file = open("pickles1.dat", "r")
  58     CIT = cPickle.load(pickle_file)
  59     CIT.append("SQL Programming")
  60     CIT.append("Database Programming")
  61     pickle_file.close()
  62    
  63     pickle_file = open("pickles1.dat","w")
  64     cPickle.dump(CIT, pickle_file)
  65     print "New data was added to the file"
  66     pickle_file.close()
  67 
  68 
  69 def display_instructions():
  70     """Display the Main menue"""
  71     print \
  72           """
  73         Main Menu:
  74         
  75           1. Exit
  76           2. Create a new file and add specifications
  77           3. Add more courses to the file
  78           4. Read the file
  79           5. Delete a course
  80           6. Display instructions
  81 
  82           """
  83 
  84 
  85 # exit the program                               >>> 1 <<<
  86 def over_program():
  87     """Exit the program"""
  88     print "Good Bye!"
  89 
  90   
  91 def main():
  92     choice = None
  93     display_instructions()
  94   
  95   
  96     while choice != 1:
  97         choice = raw_input("\nChoice: ")
  98         if choice == "1":
  99             over_program()
 100             break
 101   
 102         elif choice == "2":
 103             write_file()
 104 
 105         elif choice == "3":
 106             add_record()
 107           
 108         elif choice == "4":
 109             read_file()
 110 
 111         elif choice == "5":
 112             delete_file()
 113        
 114         elif choice == "6":
 115             display_instructions()
 116 
 117         else:
 118             print "\nSorry, but %s isn! 't a valid choice."%(choice)
 119 
 120 
 121 main()
 122 raw_input("Press Enter Key to Exit.")