I have removed the first image. The other images were generated in Python.

From here:

### Multiple Random Walks

nwalks = 200
nsteps = 100

draws = np.random.randint(0, 2, size=(nwalks, nsteps)) # 0 or 1
steps = np.where(draws == 1, 1, -1)
walks = steps.cumsum(1)

I randomly generate 0s and 1s with numpy's random.randint. Any ones stay a one which represent up jumps in the random walk. Anything other than a 1 in numpy's where function (i.e 0) turns into a -1 for a down jump. The where() function is like an if-else statement.