写段python代码，根据三点坐标计算角度

Sure, here's the Python code to calculate the angle between three points:

import math

def calculate_angle(x1, y1, x2, y2, x3, y3):
    
    # calculate distances between the points
    a = math.sqrt((x2-x1)**2 + (y2-y1)**2)
    b = math.sqrt((x3-x2)**2 + (y3-y2)**2)
    c = math.sqrt((x3-x1)**2 + (y3-y1)**2)

    # calculate angle using law of cosines
    angle_in_radians = math.acos((a**2 + b**2 - c**2) / (2 * a * b))

    # convert angle from radians to degrees
    angle_in_degrees = math.degrees(angle_in_radians)

    return angle_in_degrees

# example usage
x1, y1 = 0, 0
x2, y2 = 1, 1
x3, y3 = 2, 0
angle = calculate_angle(x1, y1, x2, y2, x3, y3)
print(f"The angle between ({x1}, {y1}), ({x2}, {y2}), and ({x3}, {y3}) is {angle} degrees.")

Hope this helps! Let me know if you have any more questions.