import numpy as np

print(np.corrcoef([1,2,3,4], [4,3,2,1]))  #负相关，变化方向相反
print(np.corrcoef([1,2,3,4], [8,3,2,1]))  #负相关，变化方向相反
print(np.corrcoef([1,2,3,4], [1,2,3,4]))  #正相关，变化方向一致
print(np.corrcoef([1,2,3,4], [1,2,3,40])) #正相关，变化趋势接近