Enable stooq dates (#569)

Passthrough start and end dates

Author: mustyoshi

docs/source/whatsnew/v0.7.0.txt

@@ -74,4 +74,5 @@ Bug Fixes
 - Fixed Yahoo! time offset (:issue:`487`).
 - Fix Yahoo! quote reader (:issue: `540`)
 - Remove import of deprecated `tm.get_data_path` (:issue: `566`)
+- Allow full usage of stooq url parameters
 - Removed unused requests-file and requests-ftp dependencies

pandas_datareader/stooq.py

@@ -12,6 +12,8 @@ class StooqDailyReader(_DailyBaseReader):
     symbols : string, array-like object (list, tuple, Series), or DataFrame
         Single stock symbol (ticker), array-like object of symbols or
         DataFrame with index containing stock symbols.
+    start: string, date which to start interval at YYYYMMDD.
+    end: string, date which to end interval at YYYYMMDD.
     retry_count : int, default 3
         Number of times to retry query request.
     pause : int, default 0.1
@@ -21,7 +23,7 @@ class StooqDailyReader(_DailyBaseReader):
         Number of symbols to download consecutively before initiating pause.
     session : Session, default None
         requests.sessions.Session instance to be used
-
+    freq: string, d, w, m ,q, y for daily, weekly, monthly, quarterly, yearly
 
     Notes
     -----
@@ -33,17 +35,20 @@ def url(self):
         """API URL"""
         return 'https://stooq.com/q/d/l/'
 
-    def _get_params(self, symbol, country="US"):
+    def _get_params(self, symbol, country='US'):
         symbol_parts = symbol.split(".")
         if len(symbol_parts) == 1:
             symbol = ".".join([symbol, country])
         else:
             if symbol_parts[1].lower() not in ['de', 'hk', 'hu', 'jp',
                                                'pl', 'uk', 'us']:
-                symbol = ".".join([symbol, "US"])
+                symbol = ".".join([symbol, 'US'])
 
         params = {
             's': symbol,
-            'i': "d"
+            'i': self.freq or 'd',
+            'd1': self.start.strftime('%Y%m%d'),
+            'd2': self.end.strftime('%Y%m%d')
         }
+
         return params

pandas_datareader/tests/test_stooq.py

@@ -10,3 +10,8 @@ def test_stooq_dji():
 def test_get_data_stooq_dji():
     f = get_data_stooq('AMZN')
     assert f.shape[0] > 0
+
+
+def test_get_data_stooq_dates():
+    f = get_data_stooq('SPY', start='20180101', end='20180115')
+    assert f.shape[0] == 9