pandas column count code example
Example 1: pandas get count of column
df['column_name'].value_counts()
Example 2: pandas count rows in column
>>> df.count(axis='columns')
0 3
1 2
2 3
3 3
4 3
dtype: int64
Example 3: python count variable and put the count in a column of data frame
df['freq'] = df.groupby('myvar')['myvar'].transform('count')