Python craigslist scraper

#!/usr/bin/python3

# Import libraries
from mechanicalsoup import StatefulBrowser
import smtplib
from os.path import expanduser

directory = expanduser("~")+'/craigslist-scraper/'

# Set message data

# set email address
name = 'Your Name'
sender = 'your@email.address'

receivers = [sender]
sender_full = 'Craigslistscraper <'+sender+'>'
receiver_full = name+' <'+sender+'>'
subject = 'New posts'

# set start of message start
message = """From: {}
To: {}
Subject: {}""".format(sender_full, receiver_full, subject)

# Try to read in list of post IDs
try:
    post_list = open(directory+'/post_list.txt').read().split('\n')
# If not set to empty list
except FileNotFoundError:
    post_list = []

# URL for seearch for bikes within 7.6 miles of 10005
# with a maximum price of $100
url = 'https://newyork.craigslist.org/d/bicycles/search/bia?postal=10005&search_distance=7.6&max_price=100'

# Create browser objects
br = StatefulBrowser()
br_post = StatefulBrowser()

# Open search URL and get page
br.open(url)
soup =  br.get_current_page()

# Loop through posts and append new posts to message
new_posts = 0
for link in soup.find_all('a'):
    href = link.get('href')
    if 'bik/d' in href:
        id = href.split('/')[-1].split('.')[0]
        if id not in post_list:
            new_posts += 1
            br_post.open(href)
            post_soup = br_post.get_current_page()
            title = post_soup.title.text
            post = post_soup.find(id='postingbody').text.split('\n')[-1]
            message = message+"\n\n\n{}\n\n{}\n\n{}".format(title, post, href)
            post_list.append(id)

# Send message if there are new posts
smtpObj = smtplib.SMTP('localhost')
if new_posts>0:
    smtpObj.sendmail(sender, receivers, message.encode('utf-8'))
    print('{} new posts sent'.format(new_posts))
    # Write updated list of posts to file
    open(directory+'post_list.txt','w').write('\n'.join(post_list[-200:]))
else:
    print('No new posts')