code: def randompaths(request, num_paths=1, size=250, mu=0, sigma=1):
      '''Lists of random walks.'''
      r = []
      for p in range(num_paths):
          v = 0
          path = [v]
          r.append(path)
          for t in range(size):
              v += normalvariate(mu, sigma)
              path.append(v)
      return f randompaths(request, num_paths=1, size=250, mu=0, sigma=1):
      '''Lists of random walks.'''
      r = []
      for p in range(num_paths):
          v = 0
          path = [v]
          r.append(path)
          for t in range(size):
              v += normalvariate(mu, sigma)
              path.append(v)
      return r
docs: Lists of random walks.