added support for sqlite database

.env.sample

@@ -1,9 +1,11 @@
 # Database
+DATABASE=sqlite
 DB_NAME=abcd
 DB_USER=abcd
 DB_PWD="abcd!#$"
 DB_HOST=localhost
 DB_PORT=5432
+DB_FILE="sample.sqlite"
 
 # Keys
 WORDBOT_TOKEN=0000000000:abcdefghij_kl_mn-op_qrst

word_bot.py

@@ -9,6 +9,7 @@ import logging
 import os
 import psycopg2
 import requests
+import sqlite3
 import telegram
 import telegram.ext
 import time
@@ -21,21 +22,28 @@ from telegram.ext import Updater, CommandHandler, MessageHandler, Filters, Callb
 
 load_dotenv()
 
-logging.basicConfig(filename='logs/word_bot.log', filemode='a', format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
+log_file_name = f"logs/wordbot_log_{datetime.date.today().strftime('%Y_%m_%d')}.log"
+logging.basicConfig(filename=log_file_name, filemode='a', format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
                      level=logging.DEBUG)
 logger = logging.getLogger()
 
 
 def connect_db():
-    pgcon = psycopg2.connect(
-        database=os.getenv("DB_NAME"), 
-        user=os.getenv("DB_USER"), 
-        password=os.getenv("DB_PWD"), 
-        host=os.getenv("DB_HOST"), 
-        port=os.getenv("DB_PORT")
-    )
+    database = os.getenv('DATABASE')
+    if database == 'postgres':
+        con = psycopg2.connect(
+            database=os.getenv("DB_NAME"), 
+            user=os.getenv("DB_USER"), 
+            password=os.getenv("DB_PWD"), 
+            host=os.getenv("DB_HOST"), 
+            port=os.getenv("DB_PORT")
+        )
+        print("connected to postgres")
+    elif database == 'sqlite':
+        con = sqlite3.connect(os.getenv('DB_FILE'))
+        print("connected to sqlite")
 
-    return pgcon
+    return con
 
 
 def start(
@@ -94,14 +102,14 @@ def word_def(
         Sends the message
     """
 
-    pgcon = connect_db()
-    if pgcon is None:
+    con = connect_db()
+    if con is None:
         print("Db connection failed")
 
     word_query = 'select * from gre_words order by random() limit 1'
 
     while True:
-        cur = pgcon.cursor()
+        cur = con.cursor()
         cur.execute(word_query)
         row = cur.fetchall()
         selected_word = row[0][1].lower()