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Module « numpy.matlib »

Fonction fromregex - module numpy.matlib

Signature de la fonction fromregex

def fromregex(file, regexp, dtype, encoding=None) 

Description

help(numpy.matlib.fromregex)

Construct an array from a text file, using regular expression parsing.

The returned array is always a structured array, and is constructed from
all matches of the regular expression in the file. Groups in the regular
expression are converted to fields of the structured array.

Parameters
----------
file : file, str, or pathlib.Path
    Filename or file object to read.

    .. versionchanged:: 1.22.0
        Now accepts `os.PathLike` implementations.

regexp : str or regexp
    Regular expression used to parse the file.
    Groups in the regular expression correspond to fields in the dtype.
dtype : dtype or list of dtypes
    Dtype for the structured array; must be a structured datatype.
encoding : str, optional
    Encoding used to decode the inputfile. Does not apply to input streams.

Returns
-------
output : ndarray
    The output array, containing the part of the content of `file` that
    was matched by `regexp`. `output` is always a structured array.

Raises
------
TypeError
    When `dtype` is not a valid dtype for a structured array.

See Also
--------
fromstring, loadtxt

Notes
-----
Dtypes for structured arrays can be specified in several forms, but all
forms specify at least the data type and field name. For details see
`basics.rec`.

Examples
--------
>>> import numpy as np
>>> from io import StringIO
>>> text = StringIO("1312 foo\n1534  bar\n444   qux")

>>> regexp = r"(\d+)\s+(...)"  # match [digits, whitespace, anything]
>>> output = np.fromregex(text, regexp,
...                       [('num', np.int64), ('key', 'S3')])
>>> output
array([(1312, b'foo'), (1534, b'bar'), ( 444, b'qux')],
      dtype=[('num', '<i8'), ('key', 'S3')])
>>> output['num']
array([1312, 1534,  444])

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