import time
import numpy as np
t0 = time.time()
world_distance = [25,50,100,150,200,250,300,350,400,450]  # 真实世界距离
raw_distance = [97,145,250,320,377,437,467,511,571, 620]  # 计算距离
coff = np.polyfit(raw_distance,world_distance,2)  # 拟合函数：Ax^2 + Bx + C
A, B, C = coff  # 获取函数参数
print(time.time()-t0)