OperationalErrorTraceback (most recent call last)
<ipython-input-19-7f3e32379345> in <module>()
----> 1 conn = get_conn('postgres','ubuntu','password')
      2 arr = fetch_data('2017-10-01','2017-10-02', conn)

<ipython-input-14-697f41c8afda> in get_conn(db, usr, password)
      2
      3 def get_conn(db, usr, password):
----> 4   conn = psycopg2.connect(dbname=db, user=usr, password=password)
      5   return conn
      6

/usr/local/lib/python2.7/dist-packages/psycopg2/__init__.pyc in connect(dsn, connection_factory, cursor_factory, **kwargs)
    128
    129     dsn = _ext.make_dsn(dsn, **kwargs)
--> 130     conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
    131     if cursor_factory is not None:
    132         conn.cursor_factory = cursor_factory

OperationalError: FATAL:  Peer authentication failed for user "ubuntu"