fix enum typing from _lib

pandas/_libs/tslibs/dtypes.pyi

@@ -28,33 +28,35 @@ class PeriodDtypeBase:
     def _td64_unit(self) -> str: ...
 
 class FreqGroup(Enum):
-    FR_ANN: int
-    FR_QTR: int
-    FR_MTH: int
-    FR_WK: int
-    FR_BUS: int
-    FR_DAY: int
-    FR_HR: int
-    FR_MIN: int
-    FR_SEC: int
-    FR_MS: int
-    FR_US: int
-    FR_NS: int
-    FR_UND: int
+    _value_: int
+    FR_ANN = ...
+    FR_QTR = ...
+    FR_MTH = ...
+    FR_WK = ...
+    FR_BUS = ...
+    FR_DAY = ...
+    FR_HR = ...
+    FR_MIN = ...
+    FR_SEC = ...
+    FR_MS = ...
+    FR_US = ...
+    FR_NS = ...
+    FR_UND = ...
     @staticmethod
     def from_period_dtype_code(code: int) -> FreqGroup: ...
 
 class Resolution(Enum):
-    RESO_NS: int
-    RESO_US: int
-    RESO_MS: int
-    RESO_SEC: int
-    RESO_MIN: int
-    RESO_HR: int
-    RESO_DAY: int
-    RESO_MTH: int
-    RESO_QTR: int
-    RESO_YR: int
+    _value_: int
+    RESO_NS = ...
+    RESO_US = ...
+    RESO_MS = ...
+    RESO_SEC = ...
+    RESO_MIN = ...
+    RESO_HR = ...
+    RESO_DAY = ...
+    RESO_MTH = ...
+    RESO_QTR = ...
+    RESO_YR = ...
     def __lt__(self, other: Resolution) -> bool: ...
     def __ge__(self, other: Resolution) -> bool: ...
     @property
@@ -67,17 +69,18 @@ class Resolution(Enum):
     def attr_abbrev(self) -> str: ...
 
 class NpyDatetimeUnit(Enum):
-    NPY_FR_Y: int
-    NPY_FR_M: int
-    NPY_FR_W: int
-    NPY_FR_D: int
-    NPY_FR_h: int
-    NPY_FR_m: int
-    NPY_FR_s: int
-    NPY_FR_ms: int
-    NPY_FR_us: int
-    NPY_FR_ns: int
-    NPY_FR_ps: int
-    NPY_FR_fs: int
-    NPY_FR_as: int
-    NPY_FR_GENERIC: int
+    _value_: int
+    NPY_FR_Y = ...
+    NPY_FR_M = ...
+    NPY_FR_W = ...
+    NPY_FR_D = ...
+    NPY_FR_h = ...
+    NPY_FR_m = ...
+    NPY_FR_s = ...
+    NPY_FR_ms = ...
+    NPY_FR_us = ...
+    NPY_FR_ns = ...
+    NPY_FR_ps = ...
+    NPY_FR_fs = ...
+    NPY_FR_as = ...
+    NPY_FR_GENERIC = ...

pandas/core/arrays/period.py

@@ -1435,11 +1435,11 @@ def _range_from_fields(
     if quarter is not None:
         if freq is None:
             freq = to_offset("Q", is_period=True)
-            base = FreqGroup.FR_QTR.value
+            base = cast(int, FreqGroup.FR_QTR.value)
         else:
             freq = to_offset(freq, is_period=True)
             base = libperiod.freq_to_dtype_code(freq)
-            if base != FreqGroup.FR_QTR.value:
+            if base != cast(int, FreqGroup.FR_QTR.value):
                 raise AssertionError("base must equal FR_QTR")
 
         freqstr = freq.freqstr

pandas/core/dtypes/dtypes.py

@@ -1030,7 +1030,10 @@ class PeriodDtype(PeriodDtypeBase, PandasExtensionDtype):
     # "Dict[int, PandasExtensionDtype]", base class "PandasExtensionDtype"
     # defined the type as "Dict[str, PandasExtensionDtype]")  [assignment]
     _cache_dtypes: dict[BaseOffset, int] = {}  # type: ignore[assignment]
-    __hash__ = PeriodDtypeBase.__hash__
+    # error: Incompatible types in assignment (expression has type
+    # "Callable[[PeriodDtypeBase], int]", base class "PandasExtensionDtype"
+    # defined the type as "Callable[[PandasExtensionDtype], int]")
+    __hash__ = PeriodDtypeBase.__hash__  # type: ignore[assignment]
     _freq: BaseOffset
     _supports_2d = True
     _can_fast_transpose = True

pandas/core/tools/datetimes.py

@@ -528,7 +528,7 @@ def _to_datetime_with_unit(arg, unit, name, utc: bool, errors: str) -> Index:
                 utc=utc,
                 errors=errors,
                 unit_for_numerics=unit,
-                creso=NpyDatetimeUnit.NPY_FR_ns.value,
+                creso=cast(int, NpyDatetimeUnit.NPY_FR_ns.value),
             )
 
     result = DatetimeIndex(arr, name=name)