numpy.fromstring

numpy.fromstring(string, dtype=float, count=-1, sep='', *, like=None)

A new 1-D array initialized from text data in a string.

Parameters

stringstr

A string containing the data.

dtypedata-type, optional

The data type of the array; default: float. For binary input data, the data must be in exactly this format. Most builtin numeric types are supported and extension types may be supported.

New in version 1.18.0: Complex dtypes.

countint, optional

Read this number of dtype elements from the data. If this is negative (the default), the count will be determined from the length of the data.

sepstr, optional

The string separating numbers in the data; extra whitespace between elements is also ignored.

Deprecated since version 1.14: Passing sep='', the default, is deprecated since it will trigger the deprecated binary mode of this function. This mode interprets string as binary bytes, rather than ASCII text with decimal numbers, an operation which is better spelt frombuffer(string, dtype, count). If string contains unicode text, the binary mode of fromstring will first encode it into bytes using either utf-8 (python 3) or the default encoding (python 2), neither of which produce sane results.

likearray_like

Reference object to allow the creation of arrays which are not NumPy arrays. If an array-like passed in as like supports the __array_function__ protocol, the result will be defined by it. In this case, it ensures the creation of an array object compatible with that passed in via this argument.

Note

The like keyword is an experimental feature pending on acceptance of NEP 35.

New in version 1.20.0.

Returns

arrndarray

The constructed array.

Raises

ValueError

If the string is not the correct size to satisfy the requested dtype and count.

See also

frombuffer, fromfile, fromiter

Examples

>>> np.fromstring('1 2', dtype=int, sep=' ')
array([1, 2])
>>> np.fromstring('1, 2', dtype=int, sep=',')
array([1, 2])

numpy.fromiter numpy.loadtxt