pdb.py 文件源码

def main():
    import getopt

    opts, args = getopt.getopt(sys.argv[1:], 'hc:', ['--help', '--command='])

    if not args:
        print(_usage)
        sys.exit(2)

    commands = []
    for opt, optarg in opts:
        if opt in ['-h', '--help']:
            print(_usage)
            sys.exit()
        elif opt in ['-c', '--command']:
            commands.append(optarg)

    mainpyfile = args[0]     # Get script filename
    if not os.path.exists(mainpyfile):
        print('Error:', mainpyfile, 'does not exist')
        sys.exit(1)

    sys.argv[:] = args      # Hide "pdb.py" and pdb options from argument list

    # Replace pdb's dir with script's dir in front of module search path.
    sys.path[0] = os.path.dirname(mainpyfile)

    # Note on saving/restoring sys.argv: it's a good idea when sys.argv was
    # modified by the script being debugged. It's a bad idea when it was
    # changed by the user from the command line. There is a "restart" command
    # which allows explicit specification of command line arguments.
    pdb = Pdb()
    pdb.rcLines.extend(commands)
    while True:
        try:
            pdb._runscript(mainpyfile)
            if pdb._user_requested_quit:
                break
            print("The program finished and will be restarted")
        except Restart:
            print("Restarting", mainpyfile, "with arguments:")
            print("\t" + " ".join(args))
        except SystemExit:
            # In most cases SystemExit does not warrant a post-mortem session.
            print("The program exited via sys.exit(). Exit status:", end=' ')
            print(sys.exc_info()[1])
        except:
            traceback.print_exc()
            print("Uncaught exception. Entering post mortem debugging")
            print("Running 'cont' or 'step' will restart the program")
            t = sys.exc_info()[2]
            pdb.interaction(None, t)
            print("Post mortem debugger finished. The " + mainpyfile +
                  " will be restarted")


# When invoked as main program, invoke the debugger on a script