If I have a dataframe structure like that:
AA1_123.zip
BB2_456.txt
CCC_789.doc
How can I change it to this:
AA1
BB2
CCC
See Question&Answers more detail:osIf I have a dataframe structure like that:
AA1_123.zip
BB2_456.txt
CCC_789.doc
How can I change it to this:
AA1
BB2
CCC
See Question&Answers more detail:os