Count the frequency that a value occurs in a dataframe column

Here is an example code snippet that counts the frequency of values in a column of a Pandas DataFrame:

Count the frequency of values in a column of a Pandas DataFrame in Python

This will output:

output

1    3
2    3
3    3
Name: A, dtype: int64

You can also use .value_counts(normalize=True) to get the frequency as a percentage.