def __init__(self, host=None, user=None, passwd=None):
"""@__init__
This constructor is responsible for defining class variables.
"""
self.db_settings = Database()
self.list_error = []
self.proceed = True
# host address
if host:
self.host = host
else:
self.host = self.db_settings.get_db_host()
# sql username for above host address
if user:
self.user = user
else:
self.user = self.db_settings.get_db_username()
# sql password for above username
if passwd:
self.passwd = passwd
else:
self.passwd = self.db_settings.get_db_password()
