What does .shape[] do in “for i in range(Y.shape[0])”?

Question

I\'m trying to break down a program line by line. Y is a matrix of data but I can\'t find any concrete data on what .shape[0] does exactly.

Answer 1

In Python shape() is use in pandas to give number of row/column:

Number of rows is given by:

train = pd.read_csv('fine_name') //load the data
train.shape[0]

Number of columns is given by

train.shape[1]