Source code for statsmodels.datasets.utils

from statsmodels.compat.python import (StringIO, urlopen, HTTPError, URLError,
                                       lrange, cPickle, urljoin, long)
import shutil
from os import environ, makedirs
from os.path import expanduser, exists, dirname, abspath, join

import numpy as np
from pandas import read_stata, read_csv, DataFrame, Series, Index


[docs]def webuse(data, baseurl='https://www.stata-press.com/data/r11/', as_df=True): """ Download and return an example dataset from Stata. Parameters ---------- data : str Name of dataset to fetch. baseurl : str The base URL to the stata datasets. as_df : bool Deprecated. Always returns a DataFrame Returns ------- dta : DataFrame A DataFrame containing the Stata dataset. Examples -------- >>> dta = webuse('auto') Notes ----- Make sure baseurl has trailing forward slash. Doesn't do any error checking in response URLs. """ url = urljoin(baseurl, data+'.dta') return read_stata(url)
class Dataset(dict): def __init__(self, **kw): # define some default attributes, so pylint can find them self.endog = None self.exog = None self.data = None self.names = None dict.__init__(self, kw) self.__dict__ = self # Some datasets have string variables. If you want a raw_data # attribute you must create this in the dataset's load function. try: # some datasets have string variables self.raw_data = self.data.astype(float) except: pass def __repr__(self): return str(self.__class__) def process_pandas(data, endog_idx=0, exog_idx=None, index_idx=None): names = data.columns if isinstance(endog_idx, (int, long)): endog_name = names[endog_idx] endog = data[endog_name].copy() if exog_idx is None: exog = data.drop([endog_name], axis=1) else: exog = data[names[exog_idx]].copy() else: endog = data.loc[:, endog_idx].copy() endog_name = list(endog.columns) if exog_idx is None: exog = data.drop(endog_name, axis=1) elif isinstance(exog_idx, (int, long)): exog = data[names[exog_idx]].copy() else: exog = data[names[exog_idx]].copy() if index_idx is not None: # NOTE: will have to be improved for dates index = Index(data.iloc[:, index_idx]) endog.index = index exog.index = index.copy() data = data.set_index(names[index_idx]) exog_name = list(exog.columns) dataset = Dataset(data=data, names=list(names), endog=endog, exog=exog, endog_name=endog_name, exog_name=exog_name) return dataset def _maybe_reset_index(data): """ All the Rdatasets have the integer row.labels from R if there is no real index. Strip this for a zero-based index """ if data.index.equals(Index(lrange(1, len(data) + 1))): data = data.reset_index(drop=True) return data def _get_cache(cache): if cache is False: # do not do any caching or load from cache cache = None elif cache is True: # use default dir for cache cache = get_data_home(None) else: cache = get_data_home(cache) return cache def _cache_it(data, cache_path): import zlib data = data.decode('utf-8') open(cache_path, "wb").write(zlib.compress(cPickle.dumps(data))) def _open_cache(cache_path): import zlib data = zlib.decompress(open(cache_path, 'rb').read()) # return as bytes object encoded in utf-8 for cross-compat of cached data = cPickle.loads(data).encode('utf-8') return data def _urlopen_cached(url, cache): """ Tries to load data from cache location otherwise downloads it. If it downloads the data and cache is not None then it will put the downloaded data in the cache path. """ from_cache = False if cache is not None: cache_path = join(cache, url.split("://")[-1].replace('/', ',') + ".zip") try: data = _open_cache(cache_path) from_cache = True except: pass # not using the cache or didn't find it in cache if not from_cache: data = urlopen(url, timeout=3).read() if cache is not None: # then put it in the cache _cache_it(data, cache_path) return data, from_cache def _get_data(base_url, dataname, cache, extension="csv"): url = base_url + (dataname + ".%s") % extension try: data, from_cache = _urlopen_cached(url, cache) except HTTPError as err: if '404' in str(err): raise ValueError("Dataset %s was not found." % dataname) else: raise err data = data.decode('utf-8', 'strict') return StringIO(data), from_cache def _get_dataset_meta(dataname, package, cache): # get the index, you'll probably want this cached because you have # to download info about all the data to get info about any of the data... index_url = ("https://raw.githubusercontent.com/vincentarelbundock/" "Rdatasets/master/datasets.csv") data, _ = _urlopen_cached(index_url, cache) data = data.decode('utf-8', 'strict') index = read_csv(StringIO(data)) idx = np.logical_and(index.Item == dataname, index.Package == package) dataset_meta = index.loc[idx] return dataset_meta["Title"].item()
[docs]def get_rdataset(dataname, package="datasets", cache=False): """download and return R dataset Parameters ---------- dataname : str The name of the dataset you want to download package : str The package in which the dataset is found. The default is the core 'datasets' package. cache : bool or str If True, will download this data into the STATSMODELS_DATA folder. The default location is a folder called statsmodels_data in the user home folder. Otherwise, you can specify a path to a folder to use for caching the data. If False, the data will not be cached. Returns ------- dataset : Dataset instance A `statsmodels.data.utils.Dataset` instance. This objects has attributes: * data - A pandas DataFrame containing the data * title - The dataset title * package - The package from which the data came * from_cache - Whether not cached data was retrieved * __doc__ - The verbatim R documentation. Notes ----- If the R dataset has an integer index. This is reset to be zero-based. Otherwise the index is preserved. The caching facilities are dumb. That is, no download dates, e-tags, or otherwise identifying information is checked to see if the data should be downloaded again or not. If the dataset is in the cache, it's used. """ # NOTE: use raw github bc html site might not be most up to date data_base_url = ("https://raw.githubusercontent.com/vincentarelbundock/Rdatasets/" "master/csv/"+package+"/") docs_base_url = ("https://raw.githubusercontent.com/vincentarelbundock/Rdatasets/" "master/doc/"+package+"/rst/") cache = _get_cache(cache) data, from_cache = _get_data(data_base_url, dataname, cache) data = read_csv(data, index_col=0) data = _maybe_reset_index(data) title = _get_dataset_meta(dataname, package, cache) doc, _ = _get_data(docs_base_url, dataname, cache, "rst") return Dataset(data=data, __doc__=doc.read(), package=package, title=title, from_cache=from_cache)
# The below function were taken from sklearn
[docs]def get_data_home(data_home=None): """Return the path of the statsmodels data dir. This folder is used by some large dataset loaders to avoid downloading the data several times. By default the data dir is set to a folder named 'statsmodels_data' in the user home folder. Alternatively, it can be set by the 'STATSMODELS_DATA' environment variable or programatically by giving an explit folder path. The '~' symbol is expanded to the user home folder. If the folder does not already exist, it is automatically created. """ if data_home is None: data_home = environ.get('STATSMODELS_DATA', join('~', 'statsmodels_data')) data_home = expanduser(data_home) if not exists(data_home): makedirs(data_home) return data_home
[docs]def clear_data_home(data_home=None): """Delete all the content of the data home cache.""" data_home = get_data_home(data_home) shutil.rmtree(data_home)
def check_internet(url=None): """Check if internet is available""" url = "https://github.com" if url is None else url try: urlopen(url) except URLError as err: return False return True def strip_column_names(df): """ Remove leading and trailing single quotes Parameters ---------- df : DataFrame DataFrame to process Returns ------- df : DataFrame Dataframe with stripped column names Notes ----- In-place modification """ columns = [] for c in df: if c.startswith('\'') and c.endswith('\''): c = c[1:-1] elif c.startswith('\''): c = c[1:] elif c.endswith('\''): c = c[:-1] columns.append(c) df.columns = columns return df def load_csv(base_file, csv_name, sep=',', convert_float=False): """Standard simple csv loader""" filepath = dirname(abspath(base_file)) filename = join(filepath,csv_name) engine = 'python' if sep != ',' else 'c' float_precision = {} if engine == 'c': float_precision = {'float_precision': 'high'} data = read_csv(filename, sep=sep, engine=engine, **float_precision) if convert_float: data = data.astype(float) return data def as_numpy_dataset(ds, as_pandas=None, retain_index=False): """Convert a pandas dataset to a NumPy dataset""" if as_pandas: return ds if as_pandas is None: import warnings warnings.warn('load will return datasets containing pandas DataFrames and Series ' 'in the Future. To suppress this message, specify as_pandas=False', FutureWarning) ds.data = ds.data.to_records(index=retain_index) for d in dir(ds): if d.startswith('_'): continue attr = getattr(ds, d) if isinstance(attr, (Series, DataFrame)): setattr(ds, d, np.asarray(attr)) return ds