ioerror

问题 I am trying to run the following bit of code: import java.sql.DriverManager; public class Connect { public static void main(String[] args){ try{ String databaseDriver = "net.sourceforge.jtds.jdbc.Driver"; Class.forName(databaseDriver); } catch (Exception e) { e.printStackTrace(); } try{ String url = "jdbc:jtds:sqlserver://BHX:1433/Forecast;instance=SQLEPXRESS"; java.sql.Connection con = DriverManager.getConnection(url); System.out.println("Connection"); } catch (Exception e){ e

问题 I am using a scientific software including a Python script that is calling os.system() which is used to run another scientific program. While the subprocess is running, Python at some point prints the following: close failed in file object destructor: IOError: [Errno 9] Bad file descriptor I believe that this message is printed at the same time as os.system() returns. My questions now are: Which conditions can lead to this type of IOError? What does it exactly mean? What does it mean for the

问题 I have a script where a user is prompted to type a filename (of a file that is to be opened), and if the file doesn't exist in the current directory, the user is prompted again. Here is the short version: file = input("Type filename: ") ... try: fileContent = open(filename, "r") ... except FileNotFoundError: ... When I tested my script on my MacOS X in Python 3.3x it worked perfectly fine when I type the wrong filename on purpose (it executes the suite under "expect"). However, when I wanted

问题 I\'m not sure why, but for some reason, whenever I have \"region\" in the file name of the output file, it gives me this error: IOError: [Errno 22] invalid mode (\'w\') or filename: \'path\\regionlog.txt\' It does this for \"region.txt\" , \"logregion.txt\" , etc. class writeTo: def __init__(self, stdout, name): self.stdout = stdout self.log = file(name, \'w\') #here is where it says the error occurs output = os.path.abspath(\'path\\regionlog.txt\') writer = writeTo(sys.stdout, output) #and