Add example

[madhuri-15]

Add example to reorder_levels function of Pandas DataFrame

[pep8speaks]

Hello @madhuri-15! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file pandas/core/frame.py:

Line 6818:14: W291 trailing whitespace
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Line 6848:75: W291 trailing whitespace
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Comment last updated at 2021-08-15 11:29:15 UTC

[attack68]

reorder_levels seems to break a lexsort. Can it be documented how to reorder and maintain the lexsorted property, i.e. by calling a sort method.

As a follow-on it might be worth proposing an issue to add a sort keyword arg to the method so that it can sort if necessary.

[MarcoGorelli]

This looks duplicative of #42935 , which was opened first - let's close in favour of that one for the time being, we can come back to this if that one goes stale - thanks anyway for your PR, and sorry to do this