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  • ▪ go through every rows of a dataframe without iteration
  • ▪ Pandas: check a sequence in one column for each unique value in another column
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  • ▪ Assign new value to a cell in pandas DataFrame which is a pandas.core.series.Series
  • ▪ How do you create a dummy variable based on the presence of a string by date, but on a different row
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