lab3.py

#   7.13 LAB: Artwork label (classes/constructors)
#   Define the Artist class with a constructor to initialize an artist's information and a print_info() method. 
#   The constructor should by default initialize the artist's name to "unknown" and the years of birth and death to -1. 
#   print_info() displays "Artist:", then a space, then the artist's name, then another space, then the birth and death
#   dates in one of three formats:
#   
#   (XXXX to YYYY) if both the birth and death years are nonnegative
#   (XXXX to present) if the birth year is nonnegative and the death year is negative
#   (unknown) otherwise
#   Define the Artwork class with a constructor to initialize an artwork's information and a print_info() method. 
#   The constructor should by default initialize the title to "unknown", the year created to -1, and the artist 
#   to use the Artist default constructor parameter values.
#   
#   Ex: If the input is:
#   
#   Pablo Picasso
#   1881
#   1973
#   Three Musicians
#   1921
#   the output is:
#   
#   Artist: Pablo Picasso (1881 to 1973)
#   Title: Three Musicians, 1921
#   Ex: If the input is:
#   
#   Brice Marden
#   1938
#   -1
#   Distant Muses
#   2000
#   the output is:
#   
#   Artist: Brice Marden (1938 to present)
#   Title: Distant Muses, 2000
#   Ex: If the input is:
#   
#   Banksy
#   -1
#   -1
#   Balloon Girl
#   2002
#   the output is:
#   
#   Artist: Banksy (unknown)
#   Title: Balloon Girl, 2002

# Solution:

class Artist:
    # Define constructor with parameters to initialize instance attributes
    #   (name, birth_year, death_year)
    def __init__(self, name='unknown', birth_year=-1, death_year=-1):
        self.name = name
        self.birth_year = birth_year
        self.death_year = death_year
        
    # Define print_info() method

    def print_info(self):
        print(f'Artist: {self.name} {self.get_age_range()}')

    # Helper function to return the age range string
    def get_age_range(self):
        age_range = '('
        if self.birth_year < 0 :
            return age_range + 'unknown)'
        else:
            age_range += str(self.birth_year) + ' to '
            if self.death_year < 0:
                return age_range + 'present)'
            else:
                return age_range + f'{self.death_year})'

      
class Artwork:
    # TODO: Define constructor with parameters to initialize instance attributes
    #       (title, year_created, artist)
    def __init__(self, title='unknown', year_created=-1, artist=Artist()):
        self.title = title
        self.year_created = year_created
        self.artist = artist
     
    # Prints the artist info and artwork label
    def print_info(self):
        self.artist.print_info()
        self.print_art_label()

    # Helper function to print artwork label
    def print_art_label(self):
        year_str = ''
        if self.year_created < 0:
            year_str = '(unknown)'
        else:
            year_str = str(self.year_created)
        print(f'Title: {self.title}, {year_str}')
        
# END OF CHANGES

if __name__ == "__main__":
    user_artist_name = input()
    user_birth_year = int(input())
    user_death_year = int(input())
    user_title = input()
    user_year_created = int(input())

    user_artist = Artist(user_artist_name, user_birth_year, user_death_year)

    new_artwork = Artwork(user_title, user_year_created, user_artist)
  
    new_artwork.print_info()