A simple python script to iterate through all the (html) files in a directory, extracting emails from each, and writing a comma-separated list to an outfile for each html file.

simple-email-extractor

import os
from bs4 import BeautifulSoup

# get a list of the files in the current directory
here = os.listdir(os.getcwd())

# define preprocessing method to extract email addresses from a given 
# html file

def preproc(infile, outfile):

  # open the infile for reading
  file = open(infile, 'r')
  
  # convert the contents of the infile to a Beautiful Soup object
  soup = BeautifulSoup(file)
  
  # extract email addresses from the soup 
  emails = soup.select('a[href^=mailto]')
  
  # open the outfile for writing, loop through the email addresses and 
  # write a comma-separated list to the outfile
  
  with open(outfile, 'w') as file:
    for i in emails:

      # to avoid certain Nonetype errors
      if i.string != None:

        # encode() to avoid throwing string errors, strip() to weed out 
        # whitespace and other junk, and add a 'comma'
        
        # to prevent the script writing a comma to the file after
        # the last email

        if emails.index(i) != len(emails)-1:
          file.write(i.string.encode('utf-8').strip()+',')
        else:
          file.write(i.string.encode('utf-8').strip())
    

# define method to iterate through the files in the directory
# and invoke the preproc() function above on each

def process(a):
  for i in (a):
    preproc(i, "out"+str(a.index(i))+".txt")