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【opencv】:TypeError: 'cv2.CascadeClassifier' object is not callable 问题

最近刚开始学Python 在采用蒙特卡罗方法求解π值的时候遇到了一个Error from random import random from math import sqrt from time import clock DARTS = 1200 hits = 0 clock() for i in range(1,DARTS): x, y = random(), random() dist = sqrt(x**2 + y**2) if dist <= 1.0:

Python绘制一个红色五角星 from turtle import * fillcolor("red") begin_fill() while True: forward(200) right(144) if abs(pos()) < 1: break end_fill()