用另一列中的值替换pandas列中的值

Question

I have a Dataframe like so, lets say x:

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And there is another dataframe with descriptions for the labelNames like so, lets say y:

enter image description here

Now, How do I replace the LabelNames in the x with the description in the y? Know that LabelNames in x is not unique

Answer 1

You can use index matching:

x = x.set_index('LabelName')
y = y.set_index('LabelName')

Then

x['Description'] = y.ClassDescription