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# -*- coding: utf-8 -*-
# _____ ______ ______ _________
# __ /_______ ____ /_ ___ /_ _____ ______ /
# _ __/_ __ `/__ __ \__ __ \_ _ \_ __ /
# / /_ / /_/ / _ /_/ /_ /_/ // __// /_/ /
# \__/ \__,_/ /_.___/ /_.___/ \___/ \__,_/
import csv
import itertools
import os
from helpers import *
from packages import simplejson as json
from packages import xlwt
try:
import yaml
except ImportError, why:
from packages import yaml
__all__ = ['Dataset', 'source']
__version__ = '0.0.3'
__build__ = '0x000003'
__author__ = 'Kenneth Reitz'
__license__ = 'MIT'
__copyright__ = 'Copyright 2010 Kenneth Reitz'
FILE_EXTENTIONS = ('csv', 'json', 'xls', 'yaml')
class Dataset(object):
"""Amazing Tabular Dataset object. """
def __init__(self, *args, **kwargs):
self._data = None
self._saved_file = None
self._saved_format = None
self._data = list(args)
try:
self.headers = kwargs['headers']
except KeyError, why:
self.headers = None
try:
self.title = kwargs['title']
except KeyError, why:
self.title = None
def __len__(self):
return self.height
def __getitem__(self, key):
if is_string(key):
if key in self.headers:
pos = self.headers.index(key) # get 'key' index from each data
return [row[pos] for row in self._data]
else:
raise KeyError
else:
return self._data[key]
def __setitem__(self, key, value):
self.validate(value)
self._data[key] = tuple(value)
def __delitem__(self, key):
del self._data[key]
def __repr__(self):
if self.title:
return '<%s dataset>' % (self.title.lower())
else:
return '<dataset object>'
def validate(self, row=None, safety=False):
"""Assures size of every row in dataset is of proper proportions."""
if row:
is_valid = (len(row) == self.width) if self.width else True
else:
is_valid = all((len(x)== self.width for x in self._data))
if is_valid:
return True
else:
if not safety:
raise InvalidDimensions
return False
def digest(self):
"""Retruns digest information of dataset in human-readable format."""
digest_text = ''
if self.title:
digest_text += 'Title: %s \n' % (self.title)
if self.headers:
digest_text += 'Headers: %s\n' % [self.headers]
digest_text += 'Height: %s\nWidth: %s\n' % (self.height, self.width)
return digest_text
@property
def height(self):
"""Returns the height of the Dataset."""
return len(self._data)
@property
def width(self):
"""Returns the width of the Dataset."""
try:
return len(self._data[0])
except KeyError, why:
return 0
@property
def json(self):
"""Returns JSON representation of Dataset."""
data = []
if self.headers:
# for (i, header) in enumerate()
data = [dict(zip(self.headers, data_row)) for data_row in self ._data]
else:
data = self._data
return json.dumps(data)
@property
def yaml(self):
"""Returns YAML representation of Dataset."""
# TODO: YAML Export
pass
@property
def csv(self):
"""Returns CSV representation of Dataset."""
# TODO: CSV Export
pass
@property
def xls(self):
"""Returns XLS representation of Dataset."""
# TODO: XLS Export
pass
def append(self, row, index=None):
# todo: impliment index
self.validate(row)
self._data.append(tuple(row))
def sort_by(self, key):
"""SORTS datastet by given key"""
# todo: accpept string if headers, or index nubmer
pass
def save(self, filename=None, format=None):
if not format:
# set format from filename
# format = filename
pass
if format not in FILE_EXTENTIONS:
raise UnsupportedFormat
# note export format
# open file, save the bitch
class InvalidDimensions(Exception):
"Invalid size"
class UnsupportedFormat(NotImplementedError):
"Format is not supported"
def source(io_string=None, filename=None):
"""docstring for import"""
#open by filename
pass
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