Add logging and more options

mail.py

@@ -1,10 +1,9 @@
+import logging
 import smtplib
 import time
-
-from string import Template
-
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
+from string import Template
 
 import pandas as pd
 
@@ -17,6 +16,8 @@ def get_contacts(filename):
     read from a file specified by filename.
     """
 
+    logging.debug(f'Loading contacts from {filename}...')
+
     return pd.read_csv(filename)
 
 
@@ -32,6 +33,10 @@ def read_template(filename):
 
 
 def main():
+    logging.basicConfig(level=LOGLEVEL, format='%(asctime)s - %(levelname)s - %(message)s')
+
+    logging.info('Starting pymail')
+
     contacts = get_contacts('contacts.csv')
     message_template = read_template('message.html')
 
@@ -39,10 +44,13 @@ def main():
     s = smtplib.SMTP(HOST, PORT)
     s.starttls()
     s.login(MY_ADDRESS, PASSWORD)
+    logging.debug('Mail server is set up.')
+
+    logging.info(f'Starting to send mails to {len(contacts.index)} recipients, this might take a while...')
 
     # For each contact, send the email:
     for i in contacts.index:
-        print(f"Sending email {i+1}\n")
+        logging.info(f"Sending email {i+1} of {len(contacts.index)}\n")
         msg = MIMEMultipart()       # create a message
 
         # add in the actual person name to the message template
@@ -50,7 +58,7 @@ def main():
         message = message_template.substitute(contact_dict)
 
         # Prints out the message body for our sake
-        print(f"{message}\n")
+        logging.debug(f"{message}\n")
 
         # setup the parameters of the message
         msg['From'] = MY_ADDRESS
@@ -60,16 +68,20 @@ def main():
         # add in the message body
         msg.attach(MIMEText(message, 'html'))
 
-        # send the message via the server set up earlier.
+        if not DRY_RUN:
-        s.send_message(msg)
+            # send the message via the server set up earlier.
+            s.send_message(msg)
         del msg
 
+        # Wait for DELAY_SEC seconds every WAIT_EVERY-th message
         if (i + 1) % WAIT_EVERY == 0:
             time.sleep(DELAY_SEC)
 
     # Terminate the SMTP session and close the connection
     s.quit()
 
+    logging.info('Done!')
+
 
 if __name__ == '__main__':
     main()

vars.py.example

@@ -7,4 +7,7 @@ HOST = 'mail.domain.tld'
 PORT = 587
 
 WAIT_EVERY = 5
-DELAY_SEC = 0
+DELAY_SEC = 0
+
+LOGLEVEL = 'INFO'
+DRY_RUN = True