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Update frame.py #42667

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32 changes: 31 additions & 1 deletion pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6788,7 +6788,37 @@ def reorder_levels(self, order: Sequence[Axis], axis: Axis = 0) -> DataFrame:
Returns
-------
DataFrame
"""

Examples
--------
>>> data={'class':['Mammals','Mammals','Reptiles','Reptiles','Amphibians','Amphibians'],
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i don't think this is pep8 formatted, can you add spaces where needed

'diet':['Omnivore','Carnivore','Carnivore','Herbivore','Omnivore','Herbivore'],
'species':['Humans','Dogs','Snakes','Iguanas','Frogs','Aquatic Salamanders']
}

>>> df=pd.DataFrame(data,columns=['class','diet','species'])
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space around the equals


>>> df.set_index(['class','diet'],drop=True,inplace=True)

>>> df.reorder_levels(["diet", "class"])
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is this how it actually renders?

diet class species
Omnivore Mammals Humans
Carnivore Mammals Dogs
Reptiles Snakes
Herbivore Reptiles Iguanas
Omnivore Amphibians Frogs
Herbivore Amphibians Aquatic Salamanders

>>> df.reorder_levels(["class","diet"])
class diet species
Mammals Omnivore Humans
Carnivore Dogs
Reptiles Carnivore Snakes
Herbivore Iguanas
Amphibians Omnivore Frogs
Herbivore Aquatic Salamanders
"""

axis = self._get_axis_number(axis)
if not isinstance(self._get_axis(axis), MultiIndex): # pragma: no cover
raise TypeError("Can only reorder levels on a hierarchical axis.")
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