Setting number of lags

Question

I am teaching myself the use of time series in Python.

I was following

https://arch.readthedocs.io/en/latest/unitroot/unitroot_examples.html

I performed

adf = ADF(default)
print(adf.summary().as_text())

It worked perfectly.

However, when I wanted to change lags like

adf.lags = 5
print(adf.summary().as_text())

or change the type of trend as in the snip below

it gives me the following error (same for the trend):

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Input In [11], in <module>
----> 1 adf.lags = 5
      2 print(adf.summary().as_text())

AttributeError: can't set attribute

Even when I follow all instructions on the exercise page and recreate it with the data used there I cannot get the lags to change. What am I doing wrong?