How can I count how many diverse item in the column 'item'?

Question

How can I count how many diverse items in the column 'item'?

               item
index
0              lm792
1       sotl085-pu01
2              lm792
3       sotl085-pu01
4          ym11-3527
            ...     
9991        Hang tag
9992        Hang tag
9993        Hang tag
9994          Thread
9995          Thread

Answer 1

Try:

df.item.value_counts()

(Assuming your dataframe is named df ).

Answer 2

Assuming your dataframe name is df, you could do

print(len(pd.unique(df.item)))
print(len(df.item.unique()))

Basically you create a list of unqiue items and then get the length of list. Documentation is here https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.unique.html and https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.unique.html#pandas.Series.unique