Thanks it works now
import os ClearScreen = os.system('clear') class library: def __init__(self): LibCode = Title = Price ='' FileName = '' def lib_method(self): LibCode = raw_input('Enter the library code: ') Title = raw_input('Enter the title: ') Price = raw_input('Enter the price( in $): ') return LibCode,Title,Price def empty_file_method(self, FileName): File = open(FileName,'a') File.seek(0,2) FileLen = File.tell() if FileLen == 0L: print print print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxx FILE ALREADY EMPTY xxxxxxx' print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print print else: File.truncate(0) if FileName == 'BookDetails': print print print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxx ALL BOOK RECORDS DELETED xxxxxxx' print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print print else: print print print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxx ALL SOFTAWARE RECORDS DELETED xxxxxxx' print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print print File.close() def clear_screen_method(self): KeyInput = 0 while not KeyInput: print ch = raw_input('Press Enter to continue ') if ch != '': print print print "Wrong key pressed. You can only press Enter" else: ClearScreen = os.system('clear') KeyInput = 1 class books(library): def __init__(self): Author = Publisher = pageCount = ISBN = '' def bks_method(self): BkFile = open('BookDetails', 'a') libM = self.lib_method() BkFile.write(libM[0] + ',') BkFile.write(libM[1] + ', ') Author = raw_input("Enter the name of the author: ") BkFile.write(Author + ',') Publisher = raw_input("Enter the name of the publisher: ") BkFile.write(Publisher + ',') ISBN = raw_input("Enter the ISBN: ") BkFile.write(ISBN + ',') PageCount = raw_input("Enter the page count: ") BkFile.write(PageCount + ',') BkFile.write(libM[2] + '\n') BkFile.close() print ''' Library Code: %s Title: %s Author: %s Publisher: %s ISBN: %s Page count: %s price: %s''' % (libM[0],libM[1], Author, Publisher, ISBN, PageCount, libM[2]) def bks_display(self): BkFile = open('BookDetails','a') BkFile.seek(0,2) BkFileLen = BkFile.tell() if BkFileLen == 0L: print print print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxx NO RECORDS AVAILABLE xxxxxxxxxxxxxxxx' print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print print BkFile.close() else: BkFile = open('BookDetails','r') print print print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxx BOOK DETAILS xxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print print end = 0 record = 1 while not end: BkDet = BkFile.readline() if BkDet != '': print print "Record number: %s" % (record) print "=================" print BkDet record = record + 1 else: print print print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxx END OF FILE xxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print print BkFile.close() class software(library): def __init__(self): ProductOf = Size = '' def sws_method(self): SwFile = open("SoftwareDetails",'a') libM = self.lib_method() SwFile.write(libM[0] + ',') SwFile.write(libM[1] + ',') ProductOf = raw_input("Enter the name of the software vendor") SwFile.write(ProductOf + ',') Size = raw_input("Enter the size of the software (in MB): ") SwFile.write(Size + ',') SwFile.write(libM[2] + '\n') SwFile.close() print ''' You have entered the following details for a book: ================================================= Library code: %s Title: %s Vendor: %s Size: %sMB Price: $%s''' % (libM[0],libM[1],ProductOf,Size,libM[2]) def sws_display(self): SwFile = open("SoftwareDetails",'a') SwFile.seek(0,2) SwFileLen = SwFile.tell() if SwFileLen == 0L: print print print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxx NO RECORDS AVAILABLE xxxxxxxxxxxxxxxxx' print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print print SwFile.close() else: SwFile = open('SoftwareDetails','r') print print print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxx SOFTWARE DETAILS xxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print print SwFile = open("SoftwareDetails",'r') end = 0 record = 1 while not end: SwDet = SwFile.readline() if SwDet != '': print print "Record number: %s " % (record) print "===================" print SwDet record = record + 1 else: print print print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxx END OF FILE xxxxxxxxxxxxxxxxxxxxxxxxx' print 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' print print end = 1 SwFile.close() def MainMenu(): MenuItems = ''' <#><#><#><#><#><#><#><#><#> <#><#><#><#><#><#><#><#><#> <#> <#> <#> Techsity university <#> <#> <#> <#><#><#><#><#><#><#><#><#> <#><#><#><#><#><#><#><#><#> MAIN MENU =========== 1 Enter details for books 2 Enter details for software 3 View details of books 4 View details of software 5 Delete all book records 6 Delete all software records 7 Quit Enter choice (1-7): ''' done = 0 while not done: MenuChoice = raw_input(MenuItems) ClearScreen = os.system('clear') print 'You entered: %s ' % MenuChoice if MenuChoice not in '1234567': print print 'Wrong choice. Enter 1,2,3,4,5,6 or 7' print else: if MenuChoice == '7': done = 1 if MenuChoice == '1': print print print ' Enter Book Details' print ' ===================' print bk.bks_method() bk.clear_screen_method() if MenuChoice == '2': print print print ' Enter SOFTWARE Details' print ' =======================' print sw.sws_method() sw.clear_screen_method() if MenuChoice == '3': bk.bks_display() bk.clear_screen_method if MenuChoice == '4': sw.sws_display() sw.clear_screen_method() if MenuChoice == '5': bk.empty_file_method('BookDetails') if MenuChoice == '6': sw.empty_file_method('SoftwareDetails') sw.clear_screen_method() bk = books() sw = software() MainMenu()