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ENH: DataFrame.explode() multiple columns #4

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Merged
merged 2 commits into from
Sep 16, 2019
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ENH: DataFrame.explode() multiple columns #4

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6326745
ENH: DataFrame.explode() multiple columns
Sep 16, 2019
fa0df42
ENH: explode multiple columns
Sep 16, 2019
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9 changes: 5 additions & 4 deletions pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6207,14 +6207,15 @@ def stack(self, level=-1, dropna=True):

def explode(self, columns: Union[str, List[str]]) -> "DataFrame":
"""
Transform each element of a list-like to a row, replicating the index values.
Transform each element of a list-like to a row, replicating index values.

.. versionadded:: 0.25.0

Parameters
----------
column : str or tuple

columns : str or list
the column(s) to be exploded

Returns
-------
DataFrame
Expand Down Expand Up @@ -6298,7 +6299,7 @@ def explode(self, columns: Union[str, List[str]]) -> "DataFrame":
lengths_equal = []

for row in self[columns].iterrows():
# converts non-lists into 1 element lists
# converts non-lists into 1 element lists so len() is valid
r=row[1].apply(lambda x: x if type(x) in (list,tuple) else [x])

# make sure all lists in the same record are the same length
Expand Down