MAINT: Fixes for Python 3.9 and older pandas

Author: bashtage

pandas_datareader/fred.py

@@ -58,8 +58,13 @@ def fetch_data(url, name):
                     ) from exc
                 raise
 
+        try:
+            data = [fetch_data(url, n) for url, n in zip(urls, names, strict=True)]
+        except TypeError:
+            # Python 3.9 only
+            data = [fetch_data(url, n) for url, n in zip(urls, names)]  # noqa: B905
         df = concat(
-            [fetch_data(url, n) for url, n in zip(urls, names, strict=True)],
+            data,
             axis=1,
             join="outer",
         )

pandas_datareader/tests/test_bankofcanada.py

@@ -41,10 +41,15 @@ def check_bankofcanada_inverted(self, code):
             date.today() - timedelta(days=30),
             date.today(),
         )
-
-        pairs = zip(
-            (1 / df)[symbol].tolist(), df_i[symbol_inverted].tolist(), strict=True
-        )
+        try:
+            pairs = zip(
+                (1 / df)[symbol].tolist(), df_i[symbol_inverted].tolist(), strict=True
+            )
+        except TypeError:
+            # Python 3.9 only
+            pairs = zip(  # noqa: B905
+                (1 / df)[symbol].tolist(), df_i[symbol_inverted].tolist()
+            )
         assert all(a - b < 0.01 for a, b in pairs)
 
     def test_bankofcanada_usd_count(self):

pandas_datareader/tests/test_famafrench.py

@@ -32,8 +32,10 @@ def test_get_available_datasets(self):
 
     def test_index(self):
         ff = web.DataReader("F-F_Research_Data_Factors", "famafrench")
-        assert ff[0].index.freq.name == "ME"
-        assert ff[1].index.freq.name == "YE-DEC"
+        # M is for legacy pandas < 2
+        assert ff[0].index.freq.name in ("ME", "M")
+        # A-DEC is for legacy pandas < 2
+        assert ff[1].index.freq.name in ("YE-DEC", "A-DEC")
 
     def test_f_f_research(self):
         results = web.DataReader(

pandas_datareader/tests/test_stooq.py

@@ -43,5 +43,5 @@ def test_stooq_googl():
 
 
 def test_get_data_ibm():
-    f = get_data_stooq("IBM.UK")
+    f = get_data_stooq("IBM.DE")
     assert f.shape[0] > 0