Want to ask how to delete the data frame has specific characters in line, such as the first line of a message 1 column, content is ABC, the second line of a message 2 columns, content is the alphabet, the third line 1 is a message, the message is 2 b, how in view of the characters' ABC 'to delete the bank, is the first the second line, no matter how few lines, only the characters' ABC' delete the bank, I use of df. Drop (' ABC 'in df [' message 1] & amp; 'ABC' in df [' message 2 ']) no, excuse me, how can,