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    • #947
      Abhishek TyagiAbhishek Tyagi
      Keymaster

      1. The format_address function separates out parts of the address string into new strings: house_number and street_name, and returns: “house number X on street named Y”. The format of the input string is: numeric house number, followed by the street name which may contain numbers, but never by themselves, and could be several words long. For example, “123 Main Street”, “1001 1st Ave”, or “55 North Center Drive”.
      Fill in the gaps to complete this function.

      Answer-

      def format_address(address_string):
        # Declare variables
        house_no = ""
        street_no = ""
        # Separate the address string into parts
        sep_addr = address_string.split()
        # Traverse through the address parts
        for addr in sep_addr:
          # Determine if the address part is the
          if addr.isdigit():
            house_no = addr
          else:
            street_no = street_no+addr
            street_no = street_no + " "
          # house number or part of the street name
      
        # Does anything else need to be done 
        # before returning the result?
        
        # Return the formatted string  
        return "house number {} on street named {}".format(house_no,street_no)
      
      print(format_address("123 Main Street"))
      # Should print: "house number 123 on-street named Main Street"
      
      print(format_address("1001 1st Ave"))
      # Should print: "house number 1001 on-street named 1st Ave"
      
      print(format_address("55 North Center Drive"))
      # Should print "house number 55 on-street named North Center Drive"

      2. The highlight_word function changes the given word in a sentence to its upper-case version. For example, highlight_word(“Have a nice day”, “nice”) returns “Have a NICE day”.
      Can you write this function in just one line?

      Answer-

      def highlight_word(sentence, word):
      	return(sentence.replace(word,word.upper()))
      
      print(highlight_word("Have a nice day", "nice"))
      print(highlight_word("Shhh, don't be so loud!", "loud"))
      print(highlight_word("Automating with Python is fun", "fun"))

      3. A professor with two assistants, Jamie and Drew, wants an attendance list of the students,
      in the order that they arrived in the classroom. Drew was the first one to note which students arrived, and then Jamie took over. After the class, they each entered their lists into the computer and emailed them to the professor, who needs to combine them into one, in the order of each student’s arrival. Jamie emailed a follow-up, saying that her list is in reverse order. Complete the steps to combine them into one list as follows: the contents of Drew’s list, followed by Jamie’s list in reverse order,
      to get an accurate list of the students as they arrived.

      Answer-

      def combine_lists(list1, list2):
        # Generate a new list containing the elements of list2
        # Followed by the elements of list1 in reverse order
        new_list = list2
        for i in reversed(range(len(list1))):
          new_list.append(list1[i])
        return new_list
      
      Jamies_list = ["Alice", "Cindy", "Bobby", "Jan", "Peter"]
      Drews_list = ["Mike", "Carol", "Greg", "Marcia"]

      4. Use a list comprehension to create a list of squared numbers (n*n).
      The function receives the variables start and end and returns a list of squares of consecutive numbers
      between start and end inclusively.
      For example, squares(2, 3) should return [4, 9]

      Answer-

      def squares(start, end):
          return [(x*x) for x in range(start,end+1)]
      
      print(squares(2, 3)) # Should be [4, 9]
      print(squares(1, 5)) # Should be [1, 4, 9, 16, 25]
      print(squares(0, 10)) # Should be [0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

      5. Complete the code to iterate through the keys and values of the car_prices dictionary, printing out some information about each one.

      Answer-

      def car_listing(car_prices):
        result = ""
        for key,value in car_prices.items():
          result += "{} costs {} dollars".format(key,value) + "\n"
        return result
      
      print(car_listing({"Kia Soul":19000, "Lamborghini Diablo":55000, "Ford Fiesta":13000, "Toyota Prius":24000}))

      6. Taylor and Rory are hosting a party. They sent out invitations, and each one collected responses into dictionaries, with names of their friends and how many guests each friend is bringing.
      Each dictionary is a partial list, but Rory’s list has more current information about the number of guests.
      Fill in the blanks to combine both dictionaries into one, with each friend listed only once, and the number of guests from Rory’s dictionary taking precedence, if a name is included in both dictionaries.
      Then print the resulting dictionary.

      Answer-

      from copy import deepcopy
      
      def combine_guests(guests1, guests2):
          backup = deepcopy(guests1)
          guests1.update(guests2)
          for guest in guests1:
              if guest in backup:
                  guests1[guest] = backup[guest]
          return guests1
      
      Rorys_guests = { "Adam":2, "Brenda":3, "David":1, "Jose":3, "Charlotte":2, "Terry":1, "Robert":4}
      Taylors_guests = { "David":4, "Nancy":1, "Robert":2, "Adam":1, "Samantha":3, "Chris":5}
      
      print(combine_guests(Rorys_guests, Taylors_guests))

      7. Use a dictionary to count the frequency of letters in the input string. Only letters should be counted, not blank spaces, numbers, or punctuation. Upper case should be considered the same as lower case. For example, count_letters(“This is a sentence.”) should return {‘t’: 2, ‘h’: 1, ‘i’: 2, ‘s’: 3, ‘a’: 1, ‘e’: 3, ‘n’: 2, ‘c’: 1}.

      Answer-

      def count_letters(text):
          elements = text.replace(" ","").lower()
          result = {}
          for letter in elements:
              if letter.isalpha():            
                  if letter not in result:
                      result[letter] = 1
                  else:
                      result[letter] +=1
          return result        
      print(count_letters("AaBbCc"))
      # Should be {'a': 2, 'b': 2, 'c': 2}
      
      print(count_letters("Math is fun! 2+2=4"))
      # Should be {'m': 1, 'a': 1, 't': 1, 'h': 1, 'i': 1, 's': 1, 'f': 1, 'u': 1, 'n': 1}
      
      print(count_letters("This is a sentence."))
      # Should be {'t': 2, 'h': 1, 'i': 2, 's': 3, 'a': 1, 'e': 3, 'n': 2, 'c': 1}
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