Four basic data types

# use numpy Realize the expression of basic data 
import numpy as np
# Scalar ( One dimensional tensor ）
a = 1
print('a:',a)
print('')
# vector ( Two dimensional tensor ）
b = np.array([1,2])
print('b:',b,'\n','b_shape:',b.shape)
print('')
# matrix ( Three dimensional tensor ）
c = np.array([[1,1],[1,2]])
print('c:',c,'\n','c_shape:',c.shape)