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update the docstring of diff #3909

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merged 3 commits into from
Mar 28, 2020
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update the docstring of diff #3909

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fa97774
don't document the dim parameter as optional
keewis Mar 28, 2020
66e0ded
update whats-new.rst
keewis Mar 28, 2020
6933f4c
fix the reference syntax
keewis Mar 28, 2020
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4 changes: 4 additions & 0 deletions doc/whats-new.rst
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Expand Up @@ -46,6 +46,10 @@ Bug fixes

Documentation
~~~~~~~~~~~~~
- update the docstring of :py:meth:`Dataset.diff` and
:py:meth:`DataArray.diff` so it does document the ``dim``
parameter as required. (:issue:`1040`, :pull:`3909`)
By `Justus Magin <https://github.com/keewis>`_.


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2 changes: 1 addition & 1 deletion xarray/core/dataarray.py
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Expand Up @@ -2696,7 +2696,7 @@ def diff(self, dim: Hashable, n: int = 1, label: Hashable = "upper") -> "DataArr

Parameters
----------
dim : hashable, optional
dim : hashable
Dimension over which to calculate the finite difference.
n : int, optional
The number of times values are differenced.
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2 changes: 1 addition & 1 deletion xarray/core/dataset.py
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Expand Up @@ -4901,7 +4901,7 @@ def diff(self, dim, n=1, label="upper"):

Parameters
----------
dim : str, optional
dim : str
Dimension over which to calculate the finite difference.
n : int, optional
The number of times values are differenced.
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