from random import choice

class RandomWalk():
	"""生产随机漫步数据的类"""
	def __init__(self,num_points=5000):
		"""初始化随机漫步的属性"""
		self.num_points = num_points
		
		#所有随机漫步的属性
		self.x=[0]
		self.y=[0]
		
	def  fill_walk(self):
		"""计算随机漫步包含的所有点"""
		
		#不断漫步，直到列表达到指定的长度
		while len(self.x)<self.num_points:
			
			#决定前进方向及沿着个方向前进的距离
			x_direction = choice([1,-1])
			x_distance = choice([0,1,2,3,4])
			x_step = x_direction * x_distance
			
			y_direction = choice([1,-1])
			y_distance = choice([0,1,2,3,4])
			y_step = y_direction * y_distance
			
			#拒绝原地踏步
			if x_step == 0 and y_step==0:
				continue
				
			#计算下一个点的X和Y值
			next_x = self.x[-1] +x_step
			next_y = self.y[-1]+y_step
			
			self.x.append(next_x)
			self.y.append(next_y)
			
			
			
			
			
			
			
			
			
			
			
