如何在python

Question

假设用户在不同的行上提供输入，并且应该以不同的方式处理每一行。例如，如果我想计算给定输入的每个用户的字符数。比如，如果用户在不同的行上输入：

this is first line
this is second line
this is third line

如何将每一行作为新输入并将其存储在某处，然后对每个输入执行一些操作（计算字符数）。

Answer 1

public class MatchingDatabaseAdapter {
    ...
    ...
    ...

    public static void addKeypoints(MatOfKeyPoint keyPoints, Context context) {
        float[] data = new float[(int)keyPoints.total() * keyPoints.channels()]; // make a spot to save the data
        keyPoints.get(0,0,data); // load the data;
        ByteBuffer buffer = ByteBuffer.allocate(data.length * 4);
        for (int i = 0; i < data.length; i++){
            buffer.putFloat(data[i]);
        }
        byte[] byteArray = buffer.array();
        addBlob(byteArray, keyPoints.rows(), keyPoints.cols(), keyPoints.type(), context);
    }

    public static void addBlob(byte[] blob, int rows, int columns, int mattype, Context context) throws SQLException {
        if (mDb == null) mDb = openDb(context);
        ContentValues contentValues = new ContentValues();
        contentValues.put(DatabaseHelper.BLOB_FIELD_NAME, blob);
        contentValues.put(DatabaseHelper.ROWS_FIELD_NAME, rows);
        contentValues.put(DatabaseHelper.COLUMNS_FIELD_NAME, columns);
        contentValues.put(DatabaseHelper.MATTYPE_FIELD_NAME, mattype);
        long x = mDb.insert(DatabaseHelper.TABLE_NAME, null, contentValues);
        Log.v(TAG, "insert said " + x + " and blob was " + blob.length + " long.");
        closeDb();
    }

    public static Cursor getAllRecordsCursor(Context context) {
        if (mDb == null || !mDb.isOpen()) mDb = openDb(context);
        mCursor = mDb.query(DatabaseHelper.TABLE_NAME, null, null, null, null,null, null);
        boolean hasRecords = mCursor.moveToFirst();
        Log.v(TAG, "MatchingDatabaseAdapter.getAllRecordsCursor() cursor created. " + mCursor + " and " + (hasRecords?"has records":"has NO RECORDS"));
        return mCursor;
    }

     public static MatOfKeyPoint getKeypointsFromNextCursorPosition() {
        MatOfKeyPoint keyPoints = null;
        if (mCursor != null) {
            Log.v(TAG, "mCursor has " + mCursor.getCount());
            mCursor.moveToFirst();
            int rows = mCursor.getInt(DatabaseHelper.ROWS_FIELD_POSITION);
            int columns = mCursor.getInt(DatabaseHelper.COLUMNS_FIELD_POSITION);
            int mattype = mCursor.getInt(DatabaseHelper.MATTYPE_FIELD_POSITION);
            keyPoints = new MatOfKeyPoint();
            keyPoints.create(rows, columns, mattype);
            byte[] blob = mCursor.getBlob(DatabaseHelper.BLOB_FIELD_POSITION);
            ByteBuffer buffer = ByteBuffer.wrap(blob);
            FloatBuffer floatBuffer = buffer.asFloatBuffer();
            float[] floatArray = new float[floatBuffer.limit()];
            floatBuffer.get(floatArray);
            keyPoints.put(0, 0, floatArray);
        }
        return keyPoints;
    }

    // INNER CLASS DatabaseHelper
    static class DatabaseHelper extends SQLiteOpenHelper {
        private static DatabaseHelper mDatabaseHelper;
        private static final String DB_NAME = "blobDb";
        private static final String TABLE_NAME = "blobTable";
        private static final String ROWS_FIELD_NAME = "rowsField";
        public static final int ROWS_FIELD_POSITION = 1;
        private static final String COLUMNS_FIELD_NAME = "columnsField";
        public static final int COLUMNS_FIELD_POSITION = 2;
        private static final String MATTYPE_FIELD_NAME = "mattypeField";
        public static final int MATTYPE_FIELD_POSITION = 3;
        private static final String BLOB_FIELD_NAME = "blobField";
        private static final int BLOB_FIELD_POSITION = 4;

        private static final java.lang.String CREATE_TABLE_SQL =
                "CREATE TABLE " + TABLE_NAME + " ("
                        + "_id INTEGER PRIMARY KEY AUTOINCREMENT, "
                        + ROWS_FIELD_NAME + " INTEGER, "
                        + COLUMNS_FIELD_NAME + " INTEGER, "
                        + MATTYPE_FIELD_NAME + " INTEGER, "
                        + BLOB_FIELD_NAME + " BLOB"
                        + ");";

        private DatabaseHelper(Context context) {
            super(context, DB_NAME, null, DB_VERSION);
            mDatabaseHelper = this;
        }

        static synchronized DatabaseHelper getInstance(Context context) {
            if (mDatabaseHelper == null) {
                mDatabaseHelper = new DatabaseHelper(context.getApplicationContext());
            }
            return mDatabaseHelper;
        }

        @Override
        public void onCreate(SQLiteDatabase db) {
            Log.v(TAG, "Creating table: " + CREATE_TABLE_SQL);
            db.execSQL(CREATE_TABLE_SQL);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            Log.v(TAG, "onUpgrade() from " + oldVersion + " to " + newVersion);
            Log.v(TAG, "ALL DATA BEING REMOVED FROM THE DATABASE!!");
            db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME + ";");
            onCreate(db);
        }
    }
}

尝试上面的代码段，希望这有帮助