pandas list unique values in column with count code example
Example 1: count unique pandas
df['column'].nunique()
Example 2: unique values in dataframe column count
df.groupby('mID').agg(['count', 'size', 'nunique']).stack()
dID hID uID
mID
A count 5 5 5
size 5 5 5
nunique 3 5 5
B count 2 2 2
size 2 2 2
nunique 2 2 2
C count 1 1 1
size 1 1 1
nunique 1 1 1
Example 3: python - count how many unique in a column
df['var_1'].nunique()
Example 4: dataframe number of unique rows
1
2
df.drop_duplicates(keep='last')