ENH: Add readers for Tiingo data

docs/source/readers/index.rst

@@ -17,5 +17,6 @@ Data Readers
    quandl
    robinhood
    stooq
+   tiingo
    tsp
    world-bank

docs/source/readers/tiingo.rst

@@ -0,0 +1,18 @@
+Tiingo
+------
+
+.. py:module:: pandas_datareader.tiingo
+
+.. autoclass:: TiingoDailyReader
+   :members:
+   :inherited-members:
+
+.. autoclass:: TiingoQuoteReader
+   :members:
+   :inherited-members:
+
+.. autoclass:: TiingoMetaDataReader
+   :members:
+   :inherited-members:
+
+.. autofunction:: get_tiingo_symbols

docs/source/remote_data.rst

@@ -66,6 +66,24 @@ Google Finance
     f = web.DataReader('F', 'google', start, end)
     f.ix['2010-01-04']
 
+.. _remote_data.tiingo:
+
+Tiingo
+======
+`Tiingo <https://www.tiingo.com>`__ is a tracing platform that provides a data
+api with historical end-of-day prices on equities, mutual funds and ETFs.
+Free registration is required to get an API key.  Free accounts are rate
+limited and can access a limited number of symbols (500 at the time of
+writing).
+
+.. ipython:: python
+
+    import os
+    import pandas_datareader as pdr
+
+    df = pdr.get_data_tiingo('GOOG', api_key=os.getenv('TIINGO_API_KEY'))
+    df.head()
+
 .. _remote_data.morningstar:
 
 Morningstar

docs/source/whatsnew/v0.6.0.txt

@@ -24,6 +24,10 @@ Highlights include:
   have been removed.  PDR would like to restore these features, and pull
   requests are welcome.
 
+- A new connector for Tiingo was introduced.  Tiingo provides
+  historical end-of-day data for a large set of equities, ETFs and mutual
+  funds. Free registration is required to get an API key (:issue:`478`).
+
 - A new connector for Robinhood was introduced.  This provides
   up to 1 year of historical end-of-day data. It also provides near
   real-time quotes.  (:issue:`477`).
@@ -72,6 +76,9 @@ Enhancements
 - A new data connector for stock pricing data provided by
   `Robinhood <https://www.robinhood.com>`__ was introduced. (:issue:`477`)
 
+- A new data connector for stock pricing data provided by
+  `Tiingo <https://api.tiingo.com/docs>`__ was introduced. (:issue:`478`)
+
 .. _whatsnew_060.api_breaking:
 
 Backwards incompatible API changes

pandas_datareader/data.py

@@ -27,6 +27,7 @@
 from pandas_datareader.robinhood import RobinhoodHistoricalReader, \
     RobinhoodQuoteReader
 from pandas_datareader.stooq import StooqDailyReader
+from pandas_datareader.tiingo import TiingoDailyReader, TiingoQuoteReader
 from pandas_datareader.yahoo.actions import (YahooActionReader, YahooDivReader)
 from pandas_datareader.yahoo.components import _get_data as \
     get_components_yahoo
@@ -114,6 +115,14 @@ def get_quotes_robinhood(*args, **kwargs):
     return RobinhoodQuoteReader(*args, **kwargs).read()
 
 
+def get_data_tiingo(*args, **kwargs):
+    return TiingoDailyReader(*args, **kwargs).read()
+
+
+def get_quotes_tiingo(*args, **kwargs):
+    return TiingoQuoteReader(*args, **kwargs).read()
+
+
 def get_markets_iex(*args, **kwargs):
     """
     Returns near-real time volume data across markets segregated by tape
@@ -384,6 +393,11 @@ def DataReader(name, data_source=None, start=None, end=None,
         return RobinhoodHistoricalReader(symbols=name, start=start, end=end,
                                          retry_count=retry_count, pause=pause,
                                          session=session).read()
+    elif data_source == 'tiingo':
+        return TiingoDailyReader(symbols=name, start=start, end=end,
+                                 retry_count=retry_count, pause=pause,
+                                 session=session,
+                                 api_key=access_key).read()
     else:
         msg = "data_source=%r is not implemented" % data_source
         raise NotImplementedError(msg)

pandas_datareader/tests/test_tiingo.py

@@ -0,0 +1,44 @@
+import os
+
+import pandas as pd
+import pytest
+
+from pandas_datareader.tiingo import TiingoDailyReader, TiingoMetaDataReader, \
+    TiingoQuoteReader
+
+TEST_API_KEY = os.getenv('TIINGO_API_KEY')
+
+syms = ['GOOG', ['GOOG', 'XOM']]
+ids = list(map(str, syms))
+
+
+@pytest.fixture(params=syms, ids=ids)
+def symbols(request):
+    return request.param
+
+
+@pytest.mark.skipif(TEST_API_KEY is None, reason="TIINGO_API_KEY not set")
+def test_tiingo_quote(symbols):
+    df = TiingoQuoteReader(symbols=symbols).read()
+    assert isinstance(df, pd.DataFrame)
+    if isinstance(symbols, str):
+        symbols = [symbols]
+    assert df.shape[0] == len(symbols)
+
+
+@pytest.mark.skipif(TEST_API_KEY is None, reason="TIINGO_API_KEY not set")
+def test_tiingo_historical(symbols):
+    df = TiingoDailyReader(symbols=symbols).read()
+    assert isinstance(df, pd.DataFrame)
+    if isinstance(symbols, str):
+        symbols = [symbols]
+    assert df.index.levels[0].shape[0] == len(symbols)
+
+
+@pytest.mark.skipif(TEST_API_KEY is None, reason="TIINGO_API_KEY not set")
+def test_tiingo_metadata(symbols):
+    df = TiingoMetaDataReader(symbols=symbols).read()
+    assert isinstance(df, pd.DataFrame)
+    if isinstance(symbols, str):
+        symbols = [symbols]
+    assert df.shape[1] == len(symbols)

pandas_datareader/tiingo.py

@@ -0,0 +1,191 @@
+import os
+
+import pandas as pd
+
+from pandas_datareader.base import _BaseReader
+
+
+def get_tiingo_symbols():
+    """
+    Get the set of stock symbols supported by Tiingo
+
+    Returns
+    -------
+    symbols : DataFrame
+        DataFrame with symbols (ticker), exchange, asset type, currency and
+        start and end dates
+
+    Notes
+    -----
+    Reads https://apimedia.tiingo.com/docs/tiingo/daily/supported_tickers.zip
+    """
+    url = 'https://apimedia.tiingo.com/docs/tiingo/daily/supported_tickers.zip'
+    return pd.read_csv(url)
+
+
+class TiingoDailyReader(_BaseReader):
+    """
+    Historical daily data from Tiingo on equities, ETFs and mutual funds
+
+    Parameters
+    ----------
+    symbols : {str, List[str]}
+        String symbol of like of symbols
+    start : str, (defaults to '1/1/2010')
+        Starting date, timestamp. Parses many different kind of date
+        representations (e.g., 'JAN-01-2010', '1/1/10', 'Jan, 1, 1980')
+    end : str, (defaults to today)
+        Ending date, timestamp. Same format as starting date.
+    retry_count : int, default 3
+        Number of times to retry query request.
+    pause : float, default 0.1
+        Time, in seconds, of the pause between retries.
+    session : Session, default None
+        requests.sessions.Session instance to be used
+    freq : {str, None}
+        Not used.
+    api_key : str, optional
+        Tiingo API key . If not provided the environmental variable
+        TIINGO_API_KEY is read. The API key is *required*.
+    """
+
+    def __init__(self, symbols, start=None, end=None, retry_count=3, pause=0.1,
+                 timeout=30, session=None, freq=None, api_key=None):
+        super(TiingoDailyReader, self).__init__(symbols, start, end,
+                                                retry_count, pause, timeout,
+                                                session, freq)
+        if isinstance(self.symbols, str):
+            self.symbols = [self.symbols]
+        self._symbol = ''
+        if api_key is None:
+            api_key = os.environ.get('TIINGO_API_KEY', None)
+        if api_key is None:
+            raise ValueError('The tiingo API key must be provided either '
+                             'through the api_key variable or through the '
+                             'environmental variable TIINGO_API_KEY.')
+        self.api_key = api_key
+        self._concat_axis = 0
+
+    @property
+    def url(self):
+        """API URL"""
+        _url = 'https://api.tiingo.com/tiingo/daily/{ticker}/prices'
+        return _url.format(ticker=self._symbol)
+
+    @property
+    def params(self):
+        """Parameters to use in API calls"""
+        return {'startDate': self.start.strftime('%Y-%m-%d'),
+                'endDate': self.end.strftime('%Y-%m-%d'),
+                'format': 'json'}
+
+    def _get_crumb(self, *args):
+        pass
+
+    def _read_one_data(self, url, params):
+        """ read one data from specified URL """
+        headers = {'Content-Type': 'application/json',
+                   'Authorization': 'Token ' + self.api_key}
+        out = self._get_response(url, params=params, headers=headers).json()
+        return self._read_lines(out)
+
+    def _read_lines(self, out):
+        df = pd.DataFrame(out)
+        df['symbol'] = self._symbol
+        df['date'] = pd.to_datetime(df['date'])
+        df = df.set_index(['symbol', 'date'])
+        return df
+
+    def read(self):
+        """Read data from connector"""
+        dfs = []
+        for symbol in self.symbols:
+            self._symbol = symbol
+            try:
+                dfs.append(self._read_one_data(self.url, self.params))
+            finally:
+                self.close()
+        return pd.concat(dfs, self._concat_axis)
+
+
+class TiingoMetaDataReader(TiingoDailyReader):
+    """
+    Read metadata about symbols from Tiingo
+
+    Parameters
+    ----------
+    symbols : {str, List[str]}
+        String symbol of like of symbols
+    start : str, (defaults to '1/1/2010')
+        Not used.
+    end : str, (defaults to today)
+        Not used.
+    retry_count : int, default 3
+        Number of times to retry query request.
+    pause : float, default 0.1
+        Time, in seconds, of the pause between retries.
+    session : Session, default None
+        requests.sessions.Session instance to be used
+    freq : {str, None}
+        Not used.
+    api_key : str, optional
+        Tiingo API key . If not provided the environmental variable
+        TIINGO_API_KEY is read. The API key is *required*.
+    """
+
+    def __init__(self, symbols, start=None, end=None, retry_count=3, pause=0.1,
+                 timeout=30, session=None, freq=None, api_key=None):
+        super(TiingoMetaDataReader, self).__init__(symbols, start, end,
+                                                   retry_count, pause, timeout,
+                                                   session, freq, api_key)
+        self._concat_axis = 1
+
+    @property
+    def url(self):
+        """API URL"""
+        _url = 'https://api.tiingo.com/tiingo/daily/{ticker}'
+        return _url.format(ticker=self._symbol)
+
+    @property
+    def params(self):
+        return None
+
+    def _read_lines(self, out):
+        s = pd.Series(out)
+        s.name = self._symbol
+        return s
+
+
+class TiingoQuoteReader(TiingoDailyReader):
+    """
+    Read quotes (latest prices) from Tiingo
+
+    Parameters
+    ----------
+    symbols : {str, List[str]}
+        String symbol of like of symbols
+    start : str, (defaults to '1/1/2010')
+        Not used.
+    end : str, (defaults to today)
+        Not used.
+    retry_count : int, default 3
+        Number of times to retry query request.
+    pause : float, default 0.1
+        Time, in seconds, of the pause between retries.
+    session : Session, default None
+        requests.sessions.Session instance to be used
+    freq : {str, None}
+        Not used.
+    api_key : str, optional
+        Tiingo API key . If not provided the environmental variable
+        TIINGO_API_KEY is read. The API key is *required*.
+
+    Notes
+    -----
+    This is a special case of the daily reader which automatically selected
+    the latest data available for each symbol.
+    """
+
+    @property
+    def params(self):
+        return None

requirements.txt

@@ -10,3 +10,4 @@ matplotlib
 ipython
 sphinx
 sphinx_rtd_theme
+requests-cache