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Missing Intro

doc/source/getting_started/comparison/includes/missing_intro.rst

3.1.0.dev0344 B
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pandas represents missing data with the special float value NaN (not a number). Many of the semantics are the same; for example missing data propagates through numeric operations, and is ignored by default for aggregations.

.. ipython:: python

outer_join outer_join["value_x"] + outer_join["value_y"] outer_join["value_x"].sum()