Can anyone help me figure out the code for this in Python?

Write a program to extract the email addresses from the mailbox file "NYC4-mbox-short. txt" and save them into another file "NYC4-emails .txt" with one extracted email address per line. The best way to find the emails in the mailbox file is to search for lines in the file that begin with "From:". When you find an email write just the address (not "From: and the address) to "NYC4-emails .txt", and don't worry about duplicates. The program should print the number of emails it wrote to the file. Example Run: Wrote 27 emails to NYC4-emails. txt