使用轴时 count() 中出现意外的关键字错误

Question

I'm getting the error:

count() got an unexpected keyword argument 'axis'

From what I've researched, this is caused by an outdated version of pandas, but when I run pd.__version__ I get version 1.2.3

Code where the error is occuring:

bdf = df.loc[df['Responsible Party'] == name]
bdf = bdf.sort_values('Date')
bdf['Patient'] = bdf['Patient'].str.replace(' ', '')
num_patients = bdf['Patient'].count(axis='columns')

Any ideas? I'm curious if this is some kind of PATH error but as far as I can tell there's no other older instalations of pandas on the system.

Answer 1

DataFrame[<column name>] returns the column values as a Pandas-Series . Count function of Series doesn't have the axis parameter like a DataFrame .

To get total count of values in the column simply use count()

num_patients = bdf['Patient'].count()

To get count of unique values in the column use nunique()

num_patients = bdf['Patient'].nunique()

For practical applications I would recommend considering SeaBean's suggestion to not use names as unique identifiers