Rage inducing code snippets from lectures and homework

Lec7.py

# How many of these lines actually do something?
if (U < A):
  x[i] = x_star
  i = i + 1
  x_prev = x_star
else: 
  x[i] = x_prev
  x_prev = x[i]
  i = i + 1
i=i-1

... later ...

if U < A:
  y[i] = y_star
  i = i + 1
  y_prev = y_star
else: 
  y[i] = y_prev
  y_prev = y[i];  
  i = i + 1

... or you could, y'know, just write ...

if (U < A):
  x[i] = x_star
  x_prev = x_star
else: 
  x[i] = x_prev
i += 1