Pandas: convert dtype 'object' to int

Question

I\'ve read an SQL query into Pandas and the values are coming in as dtype \'object\', although they are strings, dates and integers. I am able to convert the date \'object\'

Answer 1

It's simple

pd.factorize(df.purchase)[0]

Example:

labels, uniques = pd.factorize(['b', 'b', 'a', 'c', 'b'])`

labels
# array([0, 0, 1, 2, 0])

uniques
# array(['b', 'a', 'c'], dtype=object)