DOC: fixup link for lookup example

[MarcoGorelli]

Location of the documentation

https://pandas.pydata.org/pandas-docs/dev/reference/api/pandas.DataFrame.lookup.html?highlight=lookup#pandas.DataFrame.lookup

Documentation problem

It says

For an example see lookup() in the user guide.

but the hyperlink doesn't send to the user guide

Suggested fix for documentation

link to https://pandas.pydata.org/pandas-docs/stable/user_guide/indexing.html#looking-up-values-by-index-column-labels instead

[morrme]

Since it can be a little challenging for newcomers to find the relevant files (see #39859 ), the affected files/lines are:

pandas/pandas/core/frame.py

Line 4069 in 94e2982

For an example see :meth:`~pandas.DataFrame.lookup`

https://github.com/pandas-dev/pandas/blob/master/doc/source/user_guide/indexing.rst#looking-up-values-by-indexcolumn-labels

[MarcoGorelli]

Thanks @morrme

Just to be clear, this issue can be done independently of #39859

[morrme]

Thanks @morrme

Just to be clear, this issue can be done independently of #39859

Updated my comment for clarity. 🙂

[MarcoGorelli]

Thanks :)

Since it can be a little challenging to find the relevant files (see #39859

Though in this case, wouldn't the [source] button already give you the file location?