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Losowy spacer Pythona

# Python code for 1-D random walk.
import random
import numpy as np
import matplotlib.pyplot as plt
 
# Probability to move up or down
prob = [0.05, 0.95] 
 
# statically defining the starting position
start = 2 
positions = [start]
 
# creating the random points
rr = np.random.random(1000)
downp = rr < prob[0]
upp = rr > prob[1]
 
 
for idownp, iupp in zip(downp, upp):
    down = idownp and positions[-1] > 1
    up = iupp and positions[-1] < 4
    positions.append(positions[-1] - down + up)
 
# plotting down the graph of the random walk in 1D
plt.plot(positions)
plt.show()