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| 1 | +import shelve |
| 2 | +import os.path |
| 3 | + |
| 4 | +class DataBase(object): |
| 5 | + |
| 6 | + def isEmpty(self, fileName): |
| 7 | + file_object = open(fileName, "r") |
| 8 | + for line in file_object: |
| 9 | + if(line.strip() != ""): |
| 10 | + file_object.close() |
| 11 | + return False |
| 12 | + file_object.close() |
| 13 | + return True |
| 14 | + |
| 15 | + def ifFile(self,fileName): |
| 16 | + if not os.path.isfile(fileName): |
| 17 | + #print "File does not exist" |
| 18 | + return False |
| 19 | + return True |
| 20 | + |
| 21 | + def write(self, fileName, string): |
| 22 | + file_object = open(fileName, "a") |
| 23 | + file_object.write(string+"\n") |
| 24 | + file_object.close() |
| 25 | + |
| 26 | + def read(self, fileName): |
| 27 | + if not self.ifFile(fileName): |
| 28 | + return |
| 29 | + file_object = open(fileName, "r") |
| 30 | + for line in file_object: |
| 31 | + print line, |
| 32 | + file_object.close() |
| 33 | + |
| 34 | + def getKey(self, fileName): |
| 35 | + if not self.ifFile(fileName): |
| 36 | + return |
| 37 | + file_object = open(fileName, 'r') |
| 38 | + lines = file_object.readlines() |
| 39 | + file_object.close() |
| 40 | + i = 0 |
| 41 | + while(lines[i].strip() == ""): |
| 42 | + i = i+1 |
| 43 | + key = lines[i] |
| 44 | + file_object = open(fileName, 'w') |
| 45 | + file_object.write(''.join(lines[i+1:])) |
| 46 | + file_object.close() |
| 47 | + #if file empty then delete it |
| 48 | + if(self.isEmpty(fileName)): |
| 49 | + os.remove(fileName) |
| 50 | + return key |
| 51 | + |
| 52 | + def writeToHash(self, fileName, key, value): |
| 53 | + hashFile_object = shelve.open(fileName) |
| 54 | + hashFile_object[key] = value |
| 55 | + hashFile_object.close() |
| 56 | + |
| 57 | + def readFromHash(self, fileName, key): |
| 58 | + hashFile_object = shelve.open(fileName) |
| 59 | + if (key in hashFile_object): |
| 60 | + value = hashFile_object[key] |
| 61 | + hashFile_object.close() |
| 62 | + return value |
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