import numpy as np

A = [[ 1. , 2. ],
[ 1.5 , 2.5],
[ 2. , 3. ],
[ 2.6 , 3.6]]

print(type(A))

A=np.array(A) ; print(type(A))

print(A[0]);print(A[1]);print(type(A[0]))

print(A[0,0]);print(A[0,1]);print(type(A[0,0]))

print(A[:,0]);print(A[:,1]);print(type(A[:,0]))

print(A[0,:]);print(A[2,:]);

Un=np.ones([2,2]) ; print(Un)

Ze=np.zeros([2,2]) ; print(Ze)

dim_A=A.shape ; print(dim_A) ; print(type(dim_A))