利用Pycharm断点调试Python程序的方法

#!/usr/bin/pythonimport numpy as npclass Network: def __init__(self,sizes): self.num_layers=len(sizes) self.sizes=sizes self.biases=[np.random.randn(y,1) for y in sizes[1:]] self.weights=[np.random.randn(x,y) /   for x,y in zip(sizes[1:],sizes[:-1])] self.null=[]net=Network([2,3,1])def sigmoid(z): return 1.0/(1.0+np.exp(-z))