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ENH: Allow to sort on index level by name #141

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ENH: Allow to sort on index level by name #141

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c5d4ec6
ENH: Allow to sort on index level by name
jseabold Sep 14, 2011
cf2ef6e
BUG: Allow int to pass with sort on index level
jseabold Sep 14, 2011
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10 changes: 9 additions & 1 deletion pandas/core/index.py
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Original file line number Diff line number Diff line change
Expand Up @@ -790,7 +790,8 @@ def sortlevel(self, level=0, ascending=True):

Parameters
----------
level : int, default 0
level : int or str, default 0
If a string is given, must be a name of the level
ascending : boolean, default True
False to sort in descending order

Expand All @@ -799,8 +800,15 @@ def sortlevel(self, level=0, ascending=True):
sorted_index : MultiIndex
"""
labels = list(self.labels)
if not isinstance(level, int):
try:
level = self.names.index(level)
except:
raise ValueError("level %s not in index names" % level)

primary = labels.pop(level)


# Lexsort starts from END
indexer = np.lexsort(tuple(labels[::-1]) + (primary,))

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