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[WIP] Annotate DataFrame (Part 3) #28575

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[WIP] Annotate DataFrame (Part 3) #28575

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c642cf7
annotate method style
vaibhavhrt Sep 23, 2019
035d28a
initial type annotations of all methods (has errors)
vaibhavhrt Sep 23, 2019
0bbd370
Merge branch 'master' into annotate-DF-p3
vaibhavhrt Oct 29, 2019
a640588
use Iterator instead of generator and np.ndarray to dot
vaibhavhrt Oct 29, 2019
d1e92f9
Merge branch 'master' of https://github.com/pandas-dev/pandas into an…
vaibhavhrt Dec 2, 2019
cc767b3
changes
vaibhavhrt Dec 2, 2019
fd5ddd5
format black
vaibhavhrt Dec 2, 2019
ca64736
fix Styler import
vaibhavhrt Dec 2, 2019
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16 changes: 9 additions & 7 deletions pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -812,7 +812,7 @@ def to_string(
# ----------------------------------------------------------------------

@property
def style(self):
def style(self) -> "Styler":
"""
Returns a Styler object.

Expand Down Expand Up @@ -890,7 +890,7 @@ def items(self) -> Iterable[Tuple[Optional[Hashable], Series]]:
def iteritems(self):
yield from self.items()

def iterrows(self):
def iterrows(self) -> Iterable[Tuple[Index, Series]]:
"""
Iterate over DataFrame rows as (index, Series) pairs.

Expand Down Expand Up @@ -1022,13 +1022,15 @@ def itertuples(self, index=True, name="Pandas"):
# fallback to regular tuples
return zip(*arrays)

def __len__(self):
def __len__(self) -> int:
"""
Returns length of info axis, but here we use the index.
"""
return len(self.index)

def dot(self, other):
def dot(
self, other: Union[Series, DataFrame, np.ndarray]
) -> Union[Series, DataFrame, np.ndarray]:
"""
Compute the matrix multiplication between the DataFrame and other.

Expand Down Expand Up @@ -1139,13 +1141,13 @@ def dot(self, other):
else: # pragma: no cover
raise TypeError("unsupported type: {oth}".format(oth=type(other)))

def __matmul__(self, other):
def __matmul__(self, other: Union[Series, DataFrame]) -> Union[Series, DataFrame]:
"""
Matrix multiplication using binary `@` operator in Python>=3.5.
"""
return self.dot(other)

def __rmatmul__(self, other):
def __rmatmul__(self, other: Union[Series, DataFrame]) -> Union[Series, DataFrame]:
"""
Matrix multiplication using binary `@` operator in Python>=3.5.
"""
Expand Down Expand Up @@ -4825,7 +4827,7 @@ def drop_duplicates(self, subset=None, keep="first", inplace=False):
duplicated = self.duplicated(subset, keep=keep)

if inplace:
inds, = (-duplicated)._ndarray_values.nonzero()
(inds,) = (-duplicated)._ndarray_values.nonzero()
new_data = self._data.take(inds)
self._update_inplace(new_data)
else:
Expand Down