import re


def get_unique_emails(file_name):
 """
 Get all unique emails.
 """
 for line in read_file(file_name):
 match = re.findall(r'[\w\.-]+@[\w\.-]+', line)
 for email in match:
 yield email


def read_file(file_name):
 """
 Read file and yield each line.
 """
 with open(file_name) as fread:
 for line in fread:
 yield line

def print_email_list():
 """
 Print list of emails
 """
 for email in get_unique_emails('duplicate_emails'):
 print(email)