What is the difference between print(np.median(aqi_array)) and print(aqi_array.median)

Question

I wonder what is the difference between

print(np.median(aqi_array)) 

and

print(aqi_array.median())

I can use

print(aqi_array.std()) 

or

print(aqi_array.max()) 

but not

print(aqi_array.median())

Can you please explain why?

Answer 1

np.median(aqi_array) uses the NumPy library to calculate the median of the array aqi_array, aqi_array.median() is used with Pandas DataFrame or Series objects to calculate the median, but it seems aqi_array is not a Pandas object.

You can still use std() and max()onaqi_array` because those methods are available for NumPy arrays and other data structures in Python.