000AppendSum.py

# Write a function named append_sum that has one parameter — a list named named lst.
# The function should add the last two elements of lst together and append the result to lst. It should do this process three times and then return lst.
# For example, if lst started as [1, 1, 2], the final result should be [1, 1, 2, 3, 5, 8].

def append_sum(lst):
  lst.append(lst[-1] + lst[-2])
  lst.append(lst[-1] + lst[-2])
  lst.append(lst[-1] + lst[-2])
  return lst
  
print(append_sum([1, 1, 2]))