# 9 examples of 'convert list to numpy array' in Python

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``308def to_array_(v):309    return v.toArray().tolist()``
``17def to_nd_float_array(list_obj):18  return np.array(list_obj, dtype=np.float32)``
``162def _convert_to_numpy(data):163    """Returns tuple data with all elements converted to numpy ndarrays"""164    if data is None:165        return None166    elif isinstance(data, tuple):167        return tuple([_convert_to_numpy(d) for d in data])168    elif isinstance(data, np.ndarray):169        return data170    elif isinstance(data, (pd.DataFrame, pd.Series)):171        return data.to_numpy()172    else:173        raise Exception("Unsupported type %s" % str(type(data)))``
``95def to_list(v):96    if v is not None and np.isscalar(v):97        return [v]98    else:99        return v``
``151def list_of_pairs_to_numpy(l):152    return np.asarray([x[1] for x in l], np.float32), np.asarray([x[0] for x in l], np.int)``
``55def vec_to_array(vector: np.ndarray) -> np.ndarray:56    """57    Converts a 1D vector to 2D array with the length of the input vector5859    for example60    >>> x = np.linspace(0, 1, 10)61    >>> x.shape62    (10,)63    >>> vec_to_array(x).shape64    (10, 1)6566    :param vector:67    :return:68    """69    return vector.reshape((len(vector), 1))``
``356def to_ndarray(data, copy=True):357    if copy:358        cp = lambda x: np.copy(x)359    else:360        cp = lambda x: x361    if str(type(data)) == "<class 'chainer.variable.Variable'>":362        return cp(data.num)363    elif isinstance(data, np.ndarray):364        return cp(data)365    elif isinstance(data, numbers.Number):366        return data367    elif isinstance(data, collections.Iterable):368        return np.asarray(data)369    else:370        raise ValueError('Unknown type of data {}. Cannot add to list'371                         .format(type(data)))``
``20def scalar4_vec_to_np(array):21    npa = np.empty((len(array), 4))22    for i, e in enumerate(array):23        npa[i,0] = e.x24        npa[i,1] = e.y25        npa[i,2] = e.z26        npa[i,3] = e.w27    return npa``
``69def lst_2_array():70    """71    list, tuple to array72    :return: none73    """74    tp = (1, 2, 3)75    lst = [[1, 2], [3, 4]]76    print np.array(lst).shape77    # (2L, 2L)78    print np.array(lst)79    # [[1 2]80    #   [3 4]]81    print np.asarray(lst)82    # [[1 2]83    #   [3 4]]84    print np.asarray(tp)``