What does the last () in a function mean in Python?

(Since the question is almost inexperienced, there may be some inadequacies in the way you ask ...

〇 Question content In Python, for example rgs=linear_model.LinearRegression() Is the understanding that declares an object called rgs. What does the last () mean?

〇 Background

from sklearn import linear_model rgs=linear_model.LinearRegression rgs.fit(train_X, train_Y) print(rgs.coef_) print(rgs.intercept_)

I wrote the code, and the following error occurred.

TypeError Traceback (most recent call last) in 1 from sklearn import linear_model 2 rgs=linear_model.LinearRegression ----> 3 rgs.fit(train_X, train_Y) 4 print(rgs.coef_) 5 print(rgs.intercept_)

TypeError: fit() missing 1 required positional argument: 'y'

In conclusion, the second line of code rgs=linear_model.LinearRegression() If so, no error occurred and the correct result was obtained, but I'm not sure why it happened ... I'm sorry that the question is hard to see, but I would appreciate it if you could answer! Thank you.

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