/
random_walk.py
41 lines (28 loc) · 1.12 KB
/
random_walk.py
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from random import choice
class RandomWalk:
"""A class to generate random walks."""
def __init__(self, num_points=5000):
"""Initialize attributes of a walk."""
self.num_points = num_points
# All walks start at (0, 0).
self.x_values = [0]
self.y_values = [0]
def fill_walk(self):
"""Calculate all the points in the walk."""
# Keep taking steps until the walk reaches the desired length.
while len(self.x_values) < self.num_points:
# Decide which direction to go and how far to go in that direction.
x_step = get_step()
y_step = get_step()
# Reject moves that go nowhere.
if x_step != 0 or y_step != 0:
# continue
# Calculate the next x and y values.
next_x = self.x_values[-1] + x_step
next_y = self.y_values[-1] + y_step
self.x_values.append(next_x)
self.y_values.append(next_y)
def get_step():
direction = choice([1, -1])
distance = choice([0, 1, 2, 3, 4])
return direction * distance