Union of two pandas DataFrames Languages

Union of two pandas DataFrames

Say I have two data frames:df1:df2:I want the result to be the union of the two frames with an extra column showing the source data frame that the row belongs to. In case of duplicates, duplicates should be removed and the respective extra column should show both sources:
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Pandas Merging 101 Languages

Pandas Merging 101

... and more. I've seen these recurring questions asking about various facets of the pandas merge functionality. Most of the information regarding merge and its various use cases today is fragmented across dozens of badly worded, unsearchable posts. The aim here is to collate some of the more important points...
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