fileHandling1.py

#Program to update marks with user entered percentage from student.txt to studentm.txt

def computeModeratedMarks(file1, file2, addPercent):
  '''
  Objective: To compute moderated marks of students
  Input Parameters: file1, file2: file names - string values addPercent – numeric value
  Return Value: None
  Side effect: A new file – file2 of moderated marks is produced
  '''

  try:
    fIn = open(file1, 'r')
    fOut = open(file2,'w')
  except IOError:
    print('Problem in opening the file');
    sys.exit()
  line = fIn.readline()

  while(line != ''):
    sList = line.split(',')
    try:
      rollNo = int(sList[0])
      name = sList[1]
      marks = int(sList[2])
    except IndexError:
      print('Undefined Index');
      sys.exit()
    except (ValueError, TypeError):
      print('Unsuccessful conversion to int');
      sys.exit()
    maxMarks=100
    moderatedMarks = int(marks) + ((addPercent * maxMarks)/100)

    if moderatedMarks > 100:
      moderatedMarks = 100
    fOut.write(str(rollNo) + ',' + name + ',' + str(moderatedMarks) + '\n')
    line = fIn.readline()

  fIn.close()
  fOut.close()


def main():
  '''
  Objective: To compute moderated marks based on user input
  Input Parameter: None
  Return Value: None
  '''
  import sys
  sys.path.append('/home/administrator/Desktop/')
  #To compute moderated marks of students
  file1 = input('Enter name of file containing marks:')
  file2 = input('Enter output file for moderated marks:')
  addPercent = int(input('Enter moderation percentage:'))
  computeModeratedMarks(file1, file2, addPercent)

if __name__=='__main__':
  main()