[Python] With python-oracledb what does 'DPY-4027: no configuration directory to search for...

1. 
   With the python-oracledb driver the code:
   
   import oracledb
   
   cs = "MYDB"
   c = oracledb.connect(user='cj', password=mypw, dsn=cs)
   
   
   gives the error:
   
   oracledb.exceptions.DatabaseError: DPY-4027: no configuration directory to search for tnsnames.ora
2. 
   The same error also occurs in a second case:
   
   import oracledb
   
   cs = "MYDB = (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=orclpdb1)))"
   c = oracledb.connect(user='cj', password=mypw, dsn=cs)
   
   
   and with this:
   
   import oracledb
   
   cs = "MYDB = (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=orclpdb1)))"
   
   cp = oracledb.ConnectParams()
   cp.parse_connect_string(cs)

What does this mean?

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