SQL Alchemy: kann nicht verbinden mit engine.connect()

Question

Ich benutze sqlalchemy und Pandas, um eine Verbindung zu db und erstellen Sie den Datenrahmen aus SQL-Tabelle. mein Code

Dies ist:

port=3306 
unix_socket='/var/lib/mysql/mysql.sock' 

conn = "mysql://user:pwd@localhost/dbname?port=3306?unix_socket=/var/lib/mysql/mysql.sock" 

_engine = create_engine(conn) 
print conn 
print _engine 

db_conn=_engine.connect() 

Ausgang:

Traceback (most recent call last): 
    File "runner_train_test.py", line 37, in <module> 
    _engine.connect() 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/base.                      py", line 2018, in connect 
    return self._connection_cls(self, **kwargs) 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/base.                      py", line 72, in __init__ 
    if connection is not None else engine.raw_connection() 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/base.                      py", line 2104, in raw_connection 
    self.pool.unique_connection, _connection) 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/base.                      py", line 2074, in _wrap_pool_connect 
    return fn() 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                      ne 318, in unique_connection 
    return _ConnectionFairy._checkout(self) 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                      ne 713, in _checkout 
    fairy = _ConnectionRecord.checkout(pool) 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                      ne 480, in checkout 
    rec = pool._do_get() 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                      ne 1060, in _do_get 
    self._dec_overflow() 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/util/langhel                      pers.py", line 60, in __exit__ 
    compat.reraise(exc_type, exc_value, exc_tb) 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                      ne 1057, in _do_get 
    return self._create_connection() 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                      ne 323, in _create_connection 
    return _ConnectionRecord(self) 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                      ne 449, in __init__ 
    self.connection = self.__connect() 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/pool.py", li                      ne 607, in __connect 
    connection = self.__pool._invoke_creator(self) 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/strat                      egies.py", line 97, in connect 
    return dialect.connect(*cargs, **cparams) 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/sqlalchemy/engine/defau                      lt.py", line 385, in connect 
    return self.dbapi.connect(*cargs, **cparams) 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/MySQLdb/__init__.py", l                      ine 81, in Connect 
    return Connection(*args, **kwargs) 
    File "/usr/local/anaconda2/lib/python2.7/site-packages/MySQLdb/connections.py"                      , line 193, in __init__ 
    super(Connection, self).__init__(*args, **kwargs2) 
TypeError: an integer is required 

Answer 1

Ihre Verbindungszeichenfolge sieht falsch. Die sqlalchemy documentation stellt die folgende Zeichenfolge: mysql+mysqldb://<user>:<password>@<host>[:<port>]/<dbname> oder ein Beispiel für Google Cloud: mysql+mysqldb://root@/<dbname>?unix_socket=/cloudsql/<projectid>:<instancename> so sollte die Zeichenfolge probabably sein:

mysql://user@/dbname?unix_socket=/var/lib/mysql/mysql.sock