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153 lines (123 loc) · 4.42 KB
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from __future__ import absolute_import, division, print_function
import os
from pandas import ExcelWriter
from larray.core import LArray, read_csv, read_excel, read_hdf
def check_pattern(k, pattern):
return k.startswith(pattern)
def read_multi_csv(fname, name):
return read_csv(fname)
class Session(object):
def __init__(self, *args, **kwargs):
# self._objects = {}
object.__setattr__(self, '_objects', {})
if len(args) == 1 and not hasattr(args[0], 'name') and not \
isinstance(args[0], dict):
# assume we have an iterable of tuples
arg = args[0]
for k, v in arg:
self[k] = v
elif len(args) == 1 and isinstance(args[0], dict):
self.add(**args[0])
else:
self.add(*args, **kwargs)
# XXX: behave like a dict and return keys instead?
def __iter__(self):
return iter(self._objects[k] for k in self.names)
def add(self, *args, **kwargs):
for arg in args:
self[arg.name] = arg
for k, v in kwargs.items():
self[k] = v
def __getitem__(self, key):
return self._objects[key]
def __setitem__(self, key, value):
self._objects[key] = value
def __getattr__(self, key):
return self._objects[key]
def __setattr__(self, key, value):
self._objects[key] = value
def load(self, fname, names):
"""Load LArray objects from a file.
Parameters
----------
fname : str
Path to the file.
names : list of str
List of arrays to load.
"""
# TODO: add support for names=None for .h5 or .xlsx => all in file
# TODO: support path + *.csv
funcs = {'.h5': read_hdf, '.xls': read_excel, '.xlsx': read_excel,
'.csv': read_multi_csv}
_, ext = os.path.splitext(fname)
func = funcs[ext]
for name in names:
self[name] = func(fname, name)
def dump(self, fname, fmt='auto'):
"""Dumps all LArray objects to a file.
Parameters
----------
fname : str
Path for the dump.
fmt : str, optional
Dump to the `fmt` format. Defaults to 'auto' (guess from
filename).
"""
if fmt == 'auto':
_, ext = os.path.splitext(fname)
fmt = ext.strip('.')
funcs = {'h5': self.dump_hdf, 'hdf': self.dump_hdf,
'xlsx': self.dump_excel, 'xls': self.dump_excel,
'csv': self.dump_csv}
funcs[fmt](fname)
def dump_hdf(self, fname, *args, **kwargs):
for k, v in self.filter(kind=LArray).items():
v.to_hdf(fname, k, *args, **kwargs)
def dump_excel(self, fname, *args, **kwargs):
writer = ExcelWriter(fname)
for k, v in self.filter(kind=LArray).items():
v.to_excel(writer, k, *args, **kwargs)
writer.save()
def dump_csv(self, path, *args, **kwargs):
for k, v in self.filter(kind=LArray).items():
v.to_csv(os.path.join(path, '{}.csv'.format(k)), *args, **kwargs)
def filter(self, pattern=None, kind=None):
"""Return a new Session with objects which match some criteria.
Parameters
----------
pattern : str, optional
Only keep objects whose key match `pattern`.
kind : type, optional
Only keep objects which are instances of type `kind`.
Returns
-------
Session
The filtered session.
"""
if pattern is not None:
items = [(k, self._objects[k]) for k in self._objects.keys()
if check_pattern(k, pattern)]
else:
items = self._objects.items()
if kind is not None:
return Session([(k, v) for k, v in items if isinstance(v, kind)])
else:
return Session(items)
# XXX: would having an option/another function for returning this unsorted
# be any useful?
@property
def names(self):
"""Returns the list of names of the objects in the session
Returns
-------
list of str
"""
return sorted(self._objects.keys())
# XXX: sorted?
def values(self):
return self._objects.values()
# XXX: sorted?
def items(self):
return self._objects.items()
def __repr__(self):
return 'Session({})'.format(', '.join(self.names))