input: 
  import csv
  
  def get_average_salary(filename):
    total = 0
    count = 0
  
    with open(filename, 'r') as csvfile:
      csvreader = csv.reader(csvfile)
      next(csvreader) # skip header
  
      # loop through the CSV rows
      for row in csvreader:
        total += int(row[1])
        count += 1
    
    return total/count
  
  # Example output:
  # >>> get_average_salary('salary.csv')
  # 2000.0
  
output:     
    if count == 0:
      return 0
    return total / count
  