/usr/lib64/python2.6/site-packages/numpy/lib
Edit: /usr/lib64/python2.6/site-packages/numpy/lib/io.pyc (44102B)
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import on gzip.
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BagObj(obj)
Convert attribute lookups to getitems on the object passed in.
Parameters
----------
obj : class instance
Object on which attribute lookup is performed.
Examples
--------
>>> class BagDemo(object):
... def __getitem__(self, key):
... return key
...
>>> demo_obj = BagDemo()
>>> bagobj = np.lib.io.BagObj(demo_obj)
>>> bagobj.some_item
'some_item'
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NpzFile(fid)
A dictionary-like object with lazy-loading of files in the zipped
archive provided on construction.
`NpzFile` is used to load files in the NumPy ``.npz`` data archive
format. It assumes that files in the archive have a ".npy" extension,
other files are ignored.
The arrays and file strings are lazily loaded on either
getitem access using ``obj['key']`` or attribute lookup using
``obj.f.key``. A list of all files (without ".npy" extensions) can
be obtained with ``obj.files`` and the ZipFile object itself using
``obj.zip``.
Attributes
----------
files : list of str
List of all files in the archive with a ".npy" extension.
zip : ZipFile instance
The ZipFile object initialized with the zipped archive.
f : BagObj instance
An object on which attribute can be performed as an alternative
to getitem access on the `NpzFile` instance itself.
Parameters
----------
fid : file or str
The zipped archive to open. This is either a file-like object
or a string containing the path to the archive.
Examples
--------
>>> from tempfile import TemporaryFile
>>> outfile = TemporaryFile()
>>> x = np.arange(10)
>>> y = np.sin(x)
>>> np.savez(outfile, x=x, y=y)
>>> outfile.seek(0)
>>> npz = np.load(outfile)
>>> isinstance(npz, np.lib.io.NpzFile)
True
>>> npz.files
['y', 'x']
>>> npz['x'] # getitem access
array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
>>> npz.f.x # attribute lookup
array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
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Return a list of tuples, with each tuple (filename, array in file).
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| i S( s1 Return an iterator over the files in the archive.( RP ( R ( ( s2 /usr/lib64/python2.6/site-packages/numpy/lib/io.pyt iterkeys s c C s | i i | S( N( R> t __contains__( R R5 ( ( s2 /usr/lib64/python2.6/site-packages/numpy/lib/io.pyRV s ( R6 R7 R8 R0 RN RP RR RS RT RU RV ( ( ( s2 /usr/lib64/python2.6/site-packages/numpy/lib/io.pyR9 ^ s 4 c C s d d k } t | t o t | d } n* t | | i o t | } n | } d } t t i } | i | } | i
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Load a pickled, ``.npy``, or ``.npz`` binary file.
Parameters
----------
file : file-like object or string
The file to read. It must support ``seek()`` and ``read()`` methods.
If the filename extension is ``.gz``, the file is first decompressed.
mmap_mode: {None, 'r+', 'r', 'w+', 'c'}, optional
If not None, then memory-map the file, using the given mode
(see `numpy.memmap`). The mode has no effect for pickled or
zipped files.
A memory-mapped array is stored on disk, and not directly loaded
into memory. However, it can be accessed and sliced like any
ndarray. Memory mapping is especially useful for accessing
small fragments of large files without reading the entire file
into memory.
Returns
-------
result : array, tuple, dict, etc.
Data stored in the file.
Raises
------
IOError
If the input file does not exist or cannot be read.
See Also
--------
save, savez, loadtxt
memmap : Create a memory-map to an array stored in a file on disk.
Notes
-----
- If the file contains pickle data, then whatever is stored in the
pickle is returned.
- If the file is a ``.npy`` file, then an array is returned.
- If the file is a ``.npz`` file, then a dictionary-like object is
returned, containing ``{filename: array}`` key-value pairs, one for
each file in the archive.
Examples
--------
Store data to disk, and load it again:
>>> np.save('/tmp/123', np.array([[1, 2, 3], [4, 5, 6]]))
>>> np.load('/tmp/123.npy')
array([[1, 2, 3],
[4, 5, 6]])
Mem-map the stored array, and then access the second row
directly from disk:
>>> X = np.load('/tmp/123.npy', mmap_mode='r')
>>> X[1, :]
memmap([4, 5, 6])
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Save an array to a binary file in NumPy ``.npy`` format.
Parameters
----------
file : file or string
File or filename to which the data is saved. If the filename
does not already have a ``.npy`` extension, it is added.
arr : array_like
Array data to be saved.
See Also
--------
savez : Save several arrays into a ``.npz`` compressed archive
savetxt, load
Notes
-----
For a description of the ``.npy`` format, see `format`.
Examples
--------
>>> from tempfile import TemporaryFile
>>> outfile = TemporaryFile()
>>> x = np.arange(10)
>>> np.save(outfile, x)
>>> outfile.seek(0) # only necessary in this example (with tempfile)
>>> np.load(outfile)
array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
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>> from tempfile import TemporaryFile
>>> outfile = TemporaryFile()
>>> x = np.arange(10)
>>> y = np.sin(x)
Using `savez` with \*args, the arrays are saved with default names.
>>> np.savez(outfile, x, y)
>>> outfile.seek(0) # only necessary in this example (with tempfile)
>>> npz = np.load(outfile)
>>> npz.files
['arr_1', 'arr_0']
>>> npz['arr_0']
array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
Using `savez` with \*\*kwds, the arrays are saved with the keyword names.
>>> outfile = TemporaryFile()
>>> np.savez(outfile, x=x, y=y)
>>> outfile.seek(0)
>>> npz = np.load(outfile)
>>> npz.files
['y', 'x']
>>> npz['x']
array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
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qqXXn | | | >> from StringIO import StringIO # StringIO behaves like a file object
>>> c = StringIO("0 1\n2 3")
>>> np.loadtxt(c)
array([[ 0., 1.],
[ 2., 3.]])
>>> d = StringIO("M 21 72\nF 35 58")
>>> np.loadtxt(d, dtype={'names': ('gender', 'age', 'weight'),
... 'formats': ('S1', 'i4', 'f4')})
array([('M', 21, 72.0), ('F', 35, 58.0)],
dtype=[('gender', '|S1'), ('age', '>> c = StringIO("1,0,2\n3,0,4")
>>> x, y = np.loadtxt(c, delimiter=',', usecols=(0, 2), unpack=True)
>>> x
array([ 1., 3.])
>>> y
array([ 2., 4.])
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Save an array to a text file.
Parameters
----------
fname : filename or file handle
If the filename ends in ``.gz``, the file is automatically saved in
compressed gzip format. `loadtxt` understands gzipped files
transparently.
X : array_like
Data to be saved to a text file.
fmt : str or sequence of strs
A single format (%10.5f), a sequence of formats, or a
multi-format string, e.g. 'Iteration %d -- %10.5f', in which
case `delimiter` is ignored.
delimiter : str
Character separating columns.
See Also
--------
save : Save an array to a binary file in NumPy ``.npy`` format
savez : Save several arrays into a ``.npz`` compressed archive
Notes
-----
Further explanation of the `fmt` parameter
(``%[flag]width[.precision]specifier``):
flags:
``-`` : left justify
``+`` : Forces to preceed result with + or -.
``0`` : Left pad the number with zeros instead of space (see width).
width:
Minimum number of characters to be printed. The value is not truncated
if it has more characters.
precision:
- For integer specifiers (eg. ``d,i,o,x``), the minimum number of
digits.
- For ``e, E`` and ``f`` specifiers, the number of digits to print
after the decimal point.
- For ``g`` and ``G``, the maximum number of significant digits.
- For ``s``, the maximum number of characters.
specifiers:
``c`` : character
``d`` or ``i`` : signed decimal integer
``e`` or ``E`` : scientific notation with ``e`` or ``E``.
``f`` : decimal floating point
``g,G`` : use the shorter of ``e,E`` or ``f``
``o`` : signed octal
``s`` : string of characters
``u`` : unsigned decimal integer
``x,X`` : unsigned hexadecimal integer
This explanation of ``fmt`` is not complete, for an exhaustive
specification see [1]_.
References
----------
.. [1] `Format Specification Mini-Language
`_, Python Documentation.
Examples
--------
>>> savetxt('test.out', x, delimiter=',') # X is an array
>>> savetxt('test.out', (x,y,z)) # x,y,z equal sized 1D arrays
>>> savetxt('test.out', x, fmt='%1.4e') # use exponential notation
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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 : str or file
File name or file object to read.
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.
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
`doc.structured_arrays`.
Examples
--------
>>> f = open('test.dat', 'w')
>>> f.write("1312 foo\n1534 bar\n444 qux")
>>> f.close()
>>> regexp = r"(\d+)\s+(...)" # match [digits, whitespace, anything]
>>> output = np.fromregex('test.dat', regexp,
[('num', np.int64), ('key', 'S3')])
>>> output
array([(1312L, 'foo'), (1534L, 'bar'), (444L, 'qux')],
dtype=[('num', '>> output['num']
array([1312, 1534, 444], dtype=int64)
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j o |k |> |! qq~k } x( | D] }l |a |j c |` |j |l j O>> from StringIO import StringIO
>>> import numpy as np
Comma delimited file with mixed dtype
>>> s = StringIO("1,1.3,abcde")
>>> data = np.genfromtxt(s, dtype=[('myint','i8'),('myfloat','f8'),
('mystring','S5')], delimiter=",")
>>> data
array((1, 1.3, 'abcde'),
dtype=[('myint', '>> s.seek(0) # needed for StringIO example only
>>> data = np.genfromtxt(s, dtype=None,
names = ['myint','myfloat','mystring'], delimiter=",")
>>> data
array((1, 1.3, 'abcde'),
dtype=[('myint', '>> s.seek(0)
>>> data = np.genfromtxt(s, dtype="i8,f8,S5",
names=['myint','myfloat','mystring'], delimiter=",")
>>> data
array((1, 1.3, 'abcde'),
dtype=[('myint', '>> s = StringIO("11.3abcde")
>>> data = np.genfromtxt(s, dtype=None, names=['intvar','fltvar','strvar'],
delimiter=[1,3,5])
>>> data
array((1, 1.3, 'abcde'),
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