Python 3 Programming Questions

1. A Python dev must verify if key x is stored in a dictionary my_dict. If x is in dict, set value found to True; otherwise, set found to False. Which of the following code snippets will achieve this?

• Options:
  • found = my_dict.has_key(x)
  • :heavy_check_mark: found = x in my_dict
  • found = my_dict.contains(x)
  • found = x.is_elem(my_dict)
  • :heavy_check_mark:

      found = True
      try:
          y = my_dict[x]
      except KeyError as e:
          found = False
    

1. Which of the following lines python of code generate the same “result” value as the following Python code snippnet

Code Snippet:

    data = [1,2,3,4,5,6]

    def f1(x):
        return 3*x

    def f2(x):
        try:
            return x > 3
        except:
            return 0
    
    result = list(map(f1, filter(f2, data)))

Note: filter() takes 2 arguments, a function and an iterable (e.g. list)
The function passed to filter() should return a boolean value (True/False)
filter(func, iter) --> keep items if bool is True

• Options:
  • :heavy_check_mark: result = [3*i for i in data if i > 3]
  • result = [3*i for i in data(i) if i > 3]
  • :heavy_check_mark: result = list(map(lambda r: 3*r, filter(f2,data)))
  • result = list(map(lambda r: 3*r, filter(lambda f: f>3 or 0, data)))
  • result = [3*i for i in data(i) if i > 3 else 0]