arrays/period: allow parsing of PeriodDtype columns from read_csv

Fixes: #26934

Signed-off-by: Antonio Gutierrez <[email protected]>

Author: chibby0ne

doc/source/whatsnew/v0.25.0.rst

@@ -1186,6 +1186,7 @@ ExtensionArray
 - :meth:`Series.count` miscounts NA values in ExtensionArrays (:issue:`26835`)
 - Added ``Series.__array_ufunc__`` to better handle NumPy ufuncs applied to Series backed by extension arrays (:issue:`23293`).
 - Keyword argument ``deep`` has been removed from :meth:`ExtensionArray.copy` (:issue:`27083`)
+- Allow parsing of `PeriodDType` columns when using `read_csv()` (:issue:`26934`)
 
 Other
 ^^^^^

pandas/core/arrays/period.py

@@ -253,6 +253,10 @@ def _from_sequence(
         ordinals = libperiod.extract_ordinals(periods, freq)
         return cls(ordinals, freq=freq)
 
+    @classmethod
+    def _from_sequence_of_strings(cls, strings, dtype=None, copy=False):
+        return cls._from_sequence(strings, dtype, copy)
+
     @classmethod
     def _from_datetime64(cls, data, freq, tz=None):
         """

pandas/tests/extension/test_period.py

@@ -158,6 +158,4 @@ class TestPrinting(BasePeriodTests, base.BasePrintingTests):
 class TestParsing(BasePeriodTests, base.BaseParsingTests):
     @pytest.mark.parametrize("engine", ["c", "python"])
     def test_EA_types(self, engine, data):
-        expected_msg = r".*must implement _from_sequence_of_strings.*"
-        with pytest.raises(NotImplementedError, match=expected_msg):
-            super().test_EA_types(engine, data)
+        super().test_EA_types(engine, data)