E-mailing CSV + Rename + Archive

csv_email.py

import datetime
import os
import shutil
import sys
from envelopes import Envelope


def mail_send(files_to_send):
    right_now = datetime.datetime.now()

    envelope = Envelope(
        from_addr = ('EDITED@gmail.com', 'FROM_NAME'),
        to_addr = ('EDITED@gmail.com', 'TO_NAME'),
        subject = 'THIS_IS_A_SUBJECT,
        text_body = ""
    )

    full_files_to_send = []
    for each in files_to_send:
        full_files_to_send.append(archive_path + each)

    for each in full_files_to_send:
        envelope.add_attachment(each)

    envelope.send('smtp.googlemail.com', login='EDITED@gmail.com',
                  password='THIS_IS_A_PASSWORD', tls=True)


source_path = "/home/user/SendFolder/"
archive_path = "/home/user/SendFolder/Archive/"
log_path = "/home/user/SendFolder/Logs/"

#create archive folder if not existent
if not os.path.isdir(archive_path):
    )
    print("archive folder was not found, creating folder...")
    os.mkdir(archive_path)

# list to store .csv files
file_list = []

# list to store files to be e-mailed
files_to_send = []

for each in [x for x in os.listdir(source_path) if os.path.isfile(os.path.join(source_path, x))]:
    if each.endswith('csv'):
        file_list.append(each)

#check if csv files are found in file_list
if file_list != []:
    for each in file_list:
        # check if files already contain the timestamp of: "%Y%m%d_" (20160330)

        try:
            date_check = each.split('_')[0][:8]
            year_ = int(date_check[0:4])
            month_ = int(date_check[4:6])
            day_ = int(date_check[6:8])
            datetime.date(year_, month_, day_)

        # no timestamp
        except ValueError as e:
            value_error_message = str(e)
            if value_error_message in ['year is out of range', 'month must be in 1..12', 'day is out of range for month']:
                print('We have a timestamp, just not a valid one.')
                print('Stripping invalid date, and placing a valid one.')
                rename_file = each.split('_')[0][8:]

            print("Renaming {0}".format(each))
            change_name = datetime.datetime.now().strftime("%Y%m%d_") + each
            os.rename(source_path + each, source_path + change_name)
            shutil.move(source_path + change_name, archive_path + change_name)
            files_to_send.append(change_name)

        # timestamp found
        else:
            # list of archive folder files
            archive_files = [x for x in os.listdir(archive_path) if os.path.isfile(os.path.join(archive_path, x))]

            # if file is already in the archive, pass
            if each in archive_files:
                pass

            # it's not in the archive, send it there
            else:
                print("Renaming {0}".format(each))
                change_name = datetime.datetime.now().strftime("%Y%m%d_") + each
                os.rename(source_path + each, source_path + change_name)
                shutil.move(source_path + change_name, archive_path + change_name)
                files_to_send.append(change_name)
    mail_send(files_to_send)

# csv files don't exist in the source_dir
else:
    print("No csv files found, exiting...")
    sys.exit()