Meaning of X = X[:, 1] in Python

Question

I am studying this snippet of python code. What does X = X[:, 1] mean in last line?

def linreg(X,Y):
    # Running the linear regression
    X = sm.         


        

Answer 1

Something you shoud know

The term you need to search for is slice. x[start:end:step] is the full form, Here we can omit to use a default value: start defaults to 0 , end defaults to the length of the list, and step defaults to 1. And hence x[:] means same as x[0:len(x):1]