Fixed issue ranaroussi#1305. Added test case to test for trailingPegI…

…nfo statistic retrieval

tests/ticker.py

@@ -720,6 +720,18 @@ def test_info(self):
             self.assertIn("symbol", data.keys(), f"Did not find expected key '{k}' in info dict")
         self.assertEqual(self.symbols[0], data["symbol"], "Wrong symbol value in info dict")
 
+    def test_complementary_info(self):
+        # This test is to check that we can successfully retrieve the trailing PEG ratio
+
+        # We don't expect this one to have a trailing PEG ratio
+        data1 = self.tickers[0].info
+        self.assertEqual(data1['trailingPegRatio'], None)
+
+        # This one should have a trailing PEG ratio
+        data2 = self.tickers[2].info
+        self.assertEqual(data2['trailingPegRatio'], 1.2713)
+        pass
+
     # def test_fast_info_matches_info(self):
     #     fast_info_keys = set()
     #     for ticker in self.tickers:

yfinance/scrapers/quote.py

@@ -700,14 +700,12 @@ def _fetch_complementary(self, proxy):
 
             json_str = self._data.cache_get(url=url, proxy=proxy).text
             json_data = json.loads(json_str)
-            try:
-                key_stats = json_data["timeseries"]["result"][0]
-                if k not in key_stats:
-                    # Yahoo website prints N/A, indicates Yahoo lacks necessary data to calculate
-                    v = None
+            if json_data["timeseries"]["error"] is not None:
+                raise YFinanceException(f"Failed to parse json response from Yahoo Finance: " + json_data["error"])
+            for k in keys:
+                keydict = json_data["timeseries"]["result"][0]
+                if k in keydict:
+                    self._info[k] = keydict[k][-1]["reportedValue"]["raw"]
                 else:
-                    # Select most recent (last) raw value in list:
-                    v = key_stats[k][-1]["reportedValue"]["raw"]
-            except Exception:
-                v = None
-            self._info[k] = v
+                    self.info[k] = None
+