TYP: annotation of __init__ return type (PEP 484) (pandas/utils)

Author: nafarya

pandas/core/indexes/multi.py

@@ -1088,9 +1088,7 @@ def _engine(self):
         # equivalent to sorting lexicographically the codes themselves. Notice
         # that each level needs to be shifted by the number of bits needed to
         # represent the _previous_ ones:
-        offsets = np.concatenate([lev_bits[1:], [0]]).astype(  # type: ignore[arg-type]
-            "uint64"
-        )
+        offsets = np.concatenate([lev_bits[1:], [0]]).astype("uint64")
 
         # Check the total number of bits needed for our representation:
         if lev_bits[0] > 64:

pandas/util/_decorators.py

@@ -435,7 +435,7 @@ def some_function(x):
         "%s %s wrote the Raven"
     """
 
-    def __init__(self, *args, **kwargs):
+    def __init__(self, *args, **kwargs) -> None:
         if args and kwargs:
             raise AssertionError("Only positional or keyword args are allowed")
 
@@ -475,7 +475,7 @@ def my_dog(has='fleas'):
 
     addendum: str | None
 
-    def __init__(self, addendum: str | None, join: str = "", indents: int = 0):
+    def __init__(self, addendum: str | None, join: str = "", indents: int = 0) -> None:
         if indents > 0:
             self.addendum = indent(addendum, indents=indents)
         else:

pandas/util/_doctools.py

@@ -16,7 +16,7 @@ def __init__(
         cell_width: float = 0.37,
         cell_height: float = 0.25,
         font_size: float = 7.5,
-    ):
+    ) -> None:
         self.cell_width = cell_width
         self.cell_height = cell_height
         self.font_size = font_size