def sqlServerConnect():
    jdbc_url = '127.0.0.1'
    username = "username"
    password = "password"
    driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver"

    try:
        conn = zxJDBC.connect(jdbc_url, username, password, driver)
        print "Connection successful"
    except zxJDBC.DatabaseError, e:
    print "Connection failed:", e

Connection failed: driver [com.microsoft.sqlserver.jdbc.SQLServerDriver] not found