Current File : //opt/alt/python27/lib64/python2.7/site-packages/numpy/lib/_datasource.pyo
�
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e f d � � YZ d S( s� A file interface for handling local and remote data files.
The goal of datasource is to abstract some of the file system operations
when dealing with data files so the researcher doesn't have to know all the
low-level details. Through datasource, a researcher can obtain and use a
file with one function call, regardless of location of the file.
DataSource is meant to augment standard python libraries, not replace them.
It should work seemlessly with standard file IO operations and the os
module.
DataSource files can originate locally or remotely:
- local files : '/home/guido/src/local/data.txt'
- URLs (http, ftp, ...) : 'http://www.scipy.org/not/real/data.txt'
DataSource files can also be compressed or uncompressed. Currently only
gzip and bz2 are supported.
Example::
>>> # Create a DataSource, use os.curdir (default) for local storage.
>>> ds = datasource.DataSource()
>>>
>>> # Open a remote file.
>>> # DataSource downloads the file, stores it locally in:
>>> # './www.google.com/index.html'
>>> # opens the file and returns a file object.
>>> fp = ds.open('http://www.google.com/index.html')
>>>
>>> # Use the file as you normally would
>>> fp.read()
>>> fp.close()
i ( t divisiont absolute_importt print_functionNt _FileOpenersc B` s2 e Z d Z d � Z d � Z d � Z d � Z RS( s�
Container for different methods to open (un-)compressed files.
`_FileOpeners` contains a dictionary that holds one method for each
supported file format. Attribute lookup is implemented in such a way
that an instance of `_FileOpeners` itself can be indexed with the keys
of that dictionary. Currently uncompressed files as well as files
compressed with ``gzip`` or ``bz2`` compression are supported.
Notes
-----
`_file_openers`, an instance of `_FileOpeners`, is made available for
use in the `_datasource` module.
Examples
--------
>>> np.lib._datasource._file_openers.keys()
[None, '.bz2', '.gz']
>>> np.lib._datasource._file_openers['.gz'] is gzip.open
True
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Return the keys of currently supported file openers.
Parameters
----------
None
Returns
-------
keys : list
The keys are None for uncompressed files and the file extension
strings (i.e. ``'.gz'``, ``'.bz2'``) for supported compression
methods.
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Open `path` with `mode` and return the file object.
If ``path`` is an URL, it will be downloaded, stored in the
`DataSource` `destpath` directory and opened from there.
Parameters
----------
path : str
Local file path or URL to open.
mode : str, optional
Mode to open `path`. Mode 'r' for reading, 'w' for writing, 'a' to
append. Available modes depend on the type of object specified by
path. Default is 'r'.
destpath : str, optional
Path to the directory where the source file gets downloaded to for
use. If `destpath` is None, a temporary directory will be created.
The default path is the current directory.
Returns
-------
out : file object
The opened file.
Notes
-----
This is a convenience function that instantiates a `DataSource` and
returns the file object from ``DataSource.open(path)``.
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DataSource(destpath='.')
A generic data source file (file, http, ftp, ...).
DataSources can be local files or remote files/URLs. The files may
also be compressed or uncompressed. DataSource hides some of the
low-level details of downloading the file, allowing you to simply pass
in a valid file path (or URL) and obtain a file object.
Parameters
----------
destpath : str or None, optional
Path to the directory where the source file gets downloaded to for
use. If `destpath` is None, a temporary directory will be created.
The default path is the current directory.
Notes
-----
URLs require a scheme string (``http://``) to be used, without it they
will fail::
>>> repos = DataSource()
>>> repos.exists('www.google.com/index.html')
False
>>> repos.exists('http://www.google.com/index.html')
True
Temporary directories are deleted when the DataSource is deleted.
Examples
--------
::
>>> ds = DataSource('/home/guido')
>>> urlname = 'http://www.google.com/index.html'
>>> gfile = ds.open('http://www.google.com/index.html') # remote file
>>> ds.abspath(urlname)
'/home/guido/www.google.com/site/index.html'
>>> ds = DataSource(None) # use with temporary file
>>> ds.open('/home/guido/foobar.txt')
<open file '/home/guido.foobar.txt', mode 'r' at 0x91d4430>
>>> ds.abspath('/home/guido/foobar.txt')
'/tmp/tmpy4pgsP/home/guido/foobar.txt'
c C` sO | r' t j j | � | _ t | _ n$ d d l } | j � | _ t | _ d S( s2 Create a DataSource with a local path at destpath.i N( t osR t abspatht _destpathR t
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� s c C` s | j r t j | j � n d S( N( R! t shutilt rmtreeR ( R ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/numpy/lib/_datasource.pyt __del__� s c C` s( t j j | � \ } } | t j � k S( sN Test if the filename is a zip file by looking at the file extension.
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c C` s- | j | � r t j j | � S| d f Sd S( sx Split zip extension from filename and return filename.
*Returns*:
base, zip_ext : {tuple}
N( R+ R R R' R ( R R( ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/numpy/lib/_datasource.pyt _splitzipext� s c C` sP | g } | j | � sL x1 t j � D] } | r% | j | | � q% q% Wn | S( s9 Return a tuple containing compressed filename variations.( R+ R R t append( R R( t namest zipext( ( sH /opt/alt/python27/lib64/python2.7/site-packages/numpy/lib/_datasource.pyt _possible_names� s c C` sd t j d d k r& d d l m } n d d l m } | | � \ } } } } } } t | o` | � S( s= Test if path is a net location. Tests the scheme and netloc.i i ( t urlparse( t syst version_infot urllib.parseR6 t bool( R R R6 t schemet netloct upatht uparamst uqueryt ufrag( ( sH /opt/alt/python27/lib64/python2.7/site-packages/numpy/lib/_datasource.pyt _isurl s
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r | d | � � q0Xn t j | | � | S( sh Cache the file specified by path.
Creates a copy of the file in the datasource cache.
i i ( t urlopen( t URLErrort wbNs URL not found: %s( R7 R8 t urllib.requestRB t urllib.errorRC t urllib2R R R t existst dirnamet makedirsRA t _openR$ t copyfileobjt closet copyfile( R R RB RC R= t openedurlt f( ( sH /opt/alt/python27/lib64/python2.7/site-packages/numpy/lib/_datasource.pyt _cache s(
c C` s� | j | � s= | j | � } | | j | j | � � 7} n+ | j | j | � � } | | j | � } xB | D]: } | j | � ro | j | � r� | j | � } n | Sqo Wd S( sx Searches for ``path`` and returns full path if found.
If path is an URL, _findfile will cache a local copy and return the
path to the cached file. If path is a local file, _findfile will
return a path to that local file.
The search will include possible compressed versions of the file
and return the first occurence found.
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Return absolute path of file in the DataSource directory.
If `path` is an URL, then `abspath` will return either the location
the file exists locally or the location it would exist when opened
using the `open` method.
Parameters
----------
path : str
Can be a local file or a remote URL.
Returns
-------
out : str
Complete path, including the `DataSource` destination directory.
Notes
-----
The functionality is based on `os.path.abspath`.
i i ( R6 i i ( R7 R8 R9 R6 t splitR t lent _sanitize_relative_pathR R t join(
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Test if path exists.
Test if `path` exists as (and in this order):
- a local file.
- a remote URL that has been downloaded and stored locally in the
`DataSource` directory.
- a remote URL that has not been downloaded, but is valid and
accessible.
Parameters
----------
path : str
Can be a local file or a remote URL.
Returns
-------
out : bool
True if `path` exists.
Notes
-----
When `path` is an URL, `exists` will return True if it's either
stored locally in the `DataSource` directory, or is a valid remote
URL. `DataSource` does not discriminate between the two, the file
is accessible if it exists in either location.
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Open and return file-like object.
If `path` is an URL, it will be downloaded, stored in the
`DataSource` directory and opened from there.
Parameters
----------
path : str
Local file path or URL to open.
mode : {'r', 'w', 'a'}, optional
Mode to open `path`. Mode 'r' for reading, 'w' for writing,
'a' to append. Available modes depend on the type of object
specified by `path`. Default is 'r'.
Returns
-------
out : file object
File object.
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Repository(baseurl, destpath='.')
A data repository where multiple DataSource's share a base
URL/directory.
`Repository` extends `DataSource` by prepending a base URL (or
directory) to all the files it handles. Use `Repository` when you will
be working with multiple files from one base URL. Initialize
`Repository` with the base URL, then refer to each file by its filename
only.
Parameters
----------
baseurl : str
Path to the local directory or remote location that contains the
data files.
destpath : str or None, optional
Path to the directory where the source file gets downloaded to for
use. If `destpath` is None, a temporary directory will be created.
The default path is the current directory.
Examples
--------
To analyze all files in the repository, do something like this
(note: this is not self-contained code)::
>>> repos = np.lib._datasource.Repository('/home/user/data/dir/')
>>> for filename in filelist:
... fp = repos.open(filename)
... fp.analyze()
... fp.close()
Similarly you could use a URL for a repository::
>>> repos = np.lib._datasource.Repository('http://www.xyz.edu/data')
c C` s t j | d | �| | _ d S( s> Create a Repository with a shared url or directory of baseurl.R N( R R
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c C` s t j | | j | � � S( s8 Extend DataSource method to prepend baseurl to ``path``.( R RT Rn ( R R ( ( sH /opt/alt/python27/lib64/python2.7/site-packages/numpy/lib/_datasource.pyRT 1 s c C` s t j | | j | � � S( sk
Return absolute path of file in the Repository directory.
If `path` is an URL, then `abspath` will return either the location
the file exists locally or the location it would exist when opened
using the `open` method.
Parameters
----------
path : str
Can be a local file or a remote URL. This may, but does not
have to, include the `baseurl` with which the `Repository` was
initialized.
Returns
-------
out : str
Complete path, including the `DataSource` destination directory.
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Test if path exists prepending Repository base URL to path.
Test if `path` exists as (and in this order):
- a local file.
- a remote URL that has been downloaded and stored locally in the
`DataSource` directory.
- a remote URL that has not been downloaded, but is valid and
accessible.
Parameters
----------
path : str
Can be a local file or a remote URL. This may, but does not
have to, include the `baseurl` with which the `Repository` was
initialized.
Returns
-------
out : bool
True if `path` exists.
Notes
-----
When `path` is an URL, `exists` will return True if it's either
stored locally in the `DataSource` directory, or is a valid remote
URL. `DataSource` does not discriminate between the two, the file
is accessible if it exists in either location.
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Open and return file-like object prepending Repository base URL.
If `path` is an URL, it will be downloaded, stored in the
DataSource directory and opened from there.
Parameters
----------
path : str
Local file path or URL to open. This may, but does not have to,
include the `baseurl` with which the `Repository` was
initialized.
mode : {'r', 'w', 'a'}, optional
Mode to open `path`. Mode 'r' for reading, 'w' for writing,
'a' to append. Available modes depend on the type of object
specified by `path`. Default is 'r'.
Returns
-------
out : file object
File object.
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List files in the source Repository.
Returns
-------
files : list of str
List of file names (not containing a directory part).
Notes
-----
Does not currently work for remote repositories.
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