sqlalchemy.exc.ProgrammingError: (ProgrammingError) ('42000', "[42000] [Microsoft][ODBC SQL Server Driver][SQL Server]'f2f68'

[nepaul]

=======================case1==============================:
import sqlalchemy 
test1 = "631f2f68-8731-4561-889b-88ab1ae7c95a"
cmdTest1 = "select * from analyseresult where uid = " + test1
engine = sqlalchemy.create_engine("mssql+pyodbc://DumpResult:123456@localhost/DumpResult")
c = engine.execute(cmdTest1)
======================case2===============================:
import sqlalchemy 
test2 = "123"
cmdTest2 = "select * from analyseresult where uid = " + test2
engine = sqlalchemy.create_engine("mssql+pyodbc://DumpResult:123456@localhost/DumpResult")
c = engine.execute(cmdTest1)


!!!!!
case1 :wrong,(sqlalchemy.exc.ProgrammingError: (ProgrammingError) ('42000', "[42000] [Microsoft][ODBC SQL Server Driver][SQL Server]'f2f68') case2:work!