Lecture "Brute-force argorithms", exercise 5

[essepuntato]

Write in Python the function def my_reversed(input_list), which behaves like the built-in function reversed() introduced in Section "Insertion sort" and returns a proper list, and accompany the function with the related test case. It is not possible to use the built-in function reversed() in the implementation.

[n1kg0r]

def test_my_reversed(input_reversed_list, expected):
    return input_reversed_list == expected

def my_reversed(input_list):
    output_list = []
    for _ in range(len(input_list)):
        output_list.append(input_list.pop())
    return output_list

# Expect True
print(test_my_reversed(my_reversed([0,1,2,3]), [3, 2, 1, 0]))
print(test_my_reversed(my_reversed([0,1,2,3]), list(reversed([0, 1, 2, 3]))))
# Console output: True

[delete4ever]

def my_reversed(input_list):
    result= list()
    for i in range(len(input_list)):
        result.insert(i-1, input_list[-i])
    return result
#Test case
def test_reversed(input_list, expected):
    if my_reversed(input_list)== expected:
        return True
    else:
        return False
# Three test runs
print(test_reversed([0, 1, 2, 3], [3, 2, 1, 0]))
print(test_reversed(["Alice", "Bob", "Carl", "Danielle"], ["Danielle", "Carl", "Bob", "Alice"]))
print(test_reversed([0, 1, 2, 3], [1, 2, 3, 0]))

Second try:

def my_reversed(input_list):
    result= list()
    for item in input_list:
        result.insert(0, item)
    return result
#Test case
def test_reversed(input_list, expected):
    if my_reversed(input_list)== expected:
        return True
    else:
        return False
# Three test runs
print(test_reversed([0, 1, 2, 3], [3, 2, 1, 0]))
print(test_reversed(["Alice", "Bob", "Carl", "Danielle"], ["Danielle", "Carl", "Bob", "Alice"]))
print(test_reversed([0, 1, 2, 3], [1, 2, 3, 0]))

Third try:

def my_reversed(input_list):
    result=list()
    for item in input_list:
        result= [item]+ result
    return result

[lucia1299]

def test_my_reversed (input_list, expected):
    result = my_reversed(input_list)
    if result == expected:
        return True
    else:
        return False

def my_reversed(input_list):
    output_list = []
    i = len(input_list)-1
    while i >= 0: 
        output_list.append(input_list[i])
        i -= 1
    return output_list 

#Test case
print(test_my_reversed([0, 1, 2, 3], [3, 2, 1, 0]))

#Console output
True

[matteo-guenci]

def test_my_reverse(input_list, expected):
    result = my_reverse(input_list)
    if result == expected:
        return True
    else:
        return False

def my_reverse(input_list):
    reversed_list = input_list[::-1]
    return reversed_list

print(test_my_reverse([0, 1, 2, 3], [3, 2, 1, 0]))

[SpedicatiDaniele]

def test_my_reversed(input_list, expected): result = my_reversed(input_list) if result == expected: return True else: return False

def my_reversed(input_list): output_list = list() last_index = len(input_list)-1 for item in input_list: output_list.append(input_list[last_index]) last_index -= 1 return output_list

print(test_my_reversed([1, 2, 3, 4], [4, 3, 2, 1])) print(test_my_reversed([], []))

[EricaAndreose]

def test_my_reversed(input_list, expected):
    result = my_reversed(input_list)
    if expected == result:
        return True
    else:
        return False

def my_reversed(input_list):
    reverse_list = []
    pen = len(input_list) - 1
    for item in input_list:
        reverse_list.append(input_list[pen])
        pen -= 1
    return reverse_list

# Test runs that return True
print(test_my_reversed([1, 2, 3, 4, 5], [5, 4, 3, 2, 1]))
print(test_my_reversed([0, 1, 2, 3, 4, 5], [5, 4, 3, 2, 1, 0]))
print(test_my_reversed(["Sherlock", "John", "Microft", "Moriarty"], ["Moriarty", "Microft", "John", "Sherlock"]))

# Another idea come after the night!

def test_my_reversed(input_list, expected):
  result = my_reversed(input_list)
  if expected == result:
      return True
  else:
      return False

def my_reversed(input_list):
  reversed_list=[]
  for item in input_list:
      reversed_list.insert(0, item)
  return reversed_list

print(test_my_reversed(["a", "b", "c"], ["c", "b", "a"]))
print(test_my_reversed([1, 2, 3], [3, 2, 1]))

[ranacoskun]

def my_reversed(input_list):
  output_list = []
  for i in range(len(input_list)):
    output_list.append(input_list[len(input_list)-i-1])

  return output_list

def test_my_reversed(input_list, expected):
  if my_reversed(input_list) == expected:
    return True
  else: 
    return False 

print(test_my_reversed(['a','b','c','d'],['d', 'c', 'b', 'a']))
print(test_my_reversed(['1','2','3','4'],['4', '3', '2', '1']))

Or:

def my_reversed(input_list):
  output_list = []
  for item in input_list:
    output_list.insert(0, item)

  return output_list

def test_my_reversed(input_list, expected):
  if my_reversed(input_list) == expected:
    return True
  else: 
    return False 

print(test_my_reversed(['a','b','c','d'],['d', 'c', 'b', 'a']))
print(test_my_reversed(['1','2','3','4'],['4', '3', '2', '1']))

[corrado877]

def test_case_my_reverse(input_list, expected):
# Test case Algorithm
    result=my_reverse(input_list)
    if result==expected:
        return True
    else:
        return False

# Code of algorithm
def my_reverse (input_list):
    output_list=[]
    for item in range (len(input_list)):
        output_list.insert(0, input_list [item])
    return output_list

#Three test runs
print (test_case_my_reverse(["ab", "bc","de", "ef"], ['ef', 'de', 'bc', 'ab']))
print (test_case_my_reverse ([1,2,3,4], [4,3,2,1]))
print (test_case_my_reverse (["Moon", "Earth", "Venus", "Mars"], ['Mars', 'Venus', 'Earth', 'Moon']))

[ChiaraParravicini]

def test_my_reversed(input_list, expected):
    result = my_reversed(input_list)
    if expected == result:
        return True
    else:
        return False
def my_reversed(input_list):
    my_iterator = []
    i = len(input_list)
    for item in input_list:
        current_item = input_list[i-1]
        my_iterator.append(current_item)
        i -= 1
    return my_iterator
print(test_my_reversed(["Harry", "Ron", "Hermione", "Hagrid"], ["Hagrid", "Hermione", "Ron", "Harry"]))
print(test_my_reversed([1, 2, "tre", 4], [4, "tre", 2, 1]))
print(test_my_reversed([], []))

[falaimo99]

def test_my_reversed(input, expected):
    result = my_reversed(input)
    if result == expected:
        return True
    else:
        return False

def my_reversed(input):
    result = list()

    item = len(input)
    for i in range(item):
        item = item - 1
        result.append(input[item])

    return result

print(test_my_reversed([0,1,2,3,4,5], [5,4,3,2,1,0]))
print(test_my_reversed(["Aragorn", "Frodo", "Samwise"], ["Samwise", "Frodo", "Aragorn"]))
print(test_my_reversed([0,1,1,2,2,3], [3,2,2,1,1,0]))
print(test_my_reversed(["Uruk-hai", "Saruman", "Sauron", "Uruk-hai"], ["Uruk-hai", "Sauron", "Saruman","Uruk-hai"]))

[alka2696]

# Test case for the function
def test_my_reversed(input_list, expected):
    result = my_reversed(input_list)
    if expected == result:
        return True
    else:
        return False

# Code of the function
def my_reversed(input_list):
    l = list()
    for item in input_list:
        l.insert(0, item)
    return l

# Tests
print(test_my_reversed([], []))
print(test_my_reversed([1, 2, 5, 6, 4, 7, 2], [2, 7, 4, 6, 5, 2, 1]))