Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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May I please have your assistance with this lab:
2.15 LAB: Artwork label ( modules)
Part of the code is correct. I am only needing the code to be correct for the following errors:
This is the current code & errors at bottom of code:
# Artist.py
class Artist:
# below is the comstructor to initializez artist infomration
# constructor initialize the artist's name to "None" and the years of birth and death to 0
def __init__(self, name='None', birth_year=0, death_year=0):
self.name = name
self.birth_year = birth_year
self.death_year = death_year
def print_info(self):
if self.birth_year >= 0 and self.death_year >= 0:
print(f'Artist: {self.name} ({self.birth_year} to {self.death_year})')
elif self.birth_year >= 0:
print(f'Artist: {self.name} ({self.birth_year} - present)')
else:
print(f'Artist: {self.name} (unkown)')
# Artwork.py
class Artwork:
def __init__(self, title= "None", year_created=0, artist=Artist()):
self.title = title
self.year_created = year_created
self.artist = artist
def print_info(self):
self.artist.print_info()
print(f'Title: {self.title}, {self.year_created}')
# Main.py
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()
Current Errors:
4:Unit testkeyboard_arrow_up
0 / 2
Tests Artist constructor with default param values
AttributeError: 'Artist' object has no attribute 'name'
5:Unit testkeyboard_arrow_up
0 / 2
Tests that Artist('Pablo Picasso', 1881, 1973) correctly initializes artist
TypeError: Artist() takes no arguments
6:Unit testkeyboard_arrow_up
0 / 2
Tests that Artist('Brice Marden', 1938, -1) correctly initializes artist
TypeError: Artist() takes no arguments
7:Unit testkeyboard_arrow_up
0 / 1
Tests Artwork constructor with default param values
AttributeError: 'Artwork' object has no attribute 'title'
Please see attached lab and error messages.
Thank you.
Transcribed Image Text:2.15 LAB: Artwork label (modules)
Define the Artist class in Artist.py with a constructor to initialize an artist's information. The constructor should by default initialize the artist's name to "unknown" and the years of birth and death to -1.
Define the Artwork class in Artwork.py with a constructor to initialize an artwork's information. The constructor should by default initialize the title to "unknown", the year created to -1, and the artist to use the Artist class's default constructor parameter values. Add an import statement to import the Artist class.
Add import statements to main.py to import the Artist and Artwork classes.
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
```
Transcribed Image Text:The image shows the results of a series of unit tests related to the construction of `Artist` and `Artwork` objects.
### Detailed Explanation:
1. **4th Unit Test (0/2):**
- **Test Description:** Tests the `Artist` constructor with default parameter values.
- **Error Message:** `AttributeError: 'Artist' object has no attribute 'name'`
- **Explanation:** This error indicates that there is an attempt to access an attribute `name` that does not exist in the `Artist` class when using default parameters.
2. **5th Unit Test (0/2):**
- **Test Description:** Tests that `Artist(Pablo Picasso, 1881, 1973)` correctly initializes the artist.
- **Error Message:** `TypeError: Artist() takes no arguments`
- **Explanation:** The error suggests that the `Artist` class constructor is not designed to accept arguments, but arguments were provided during initialization.
3. **6th Unit Test (0/2):**
- **Test Description:** Tests that `Artist(Brice Marden, 1938, -1)` correctly initializes the artist.
- **Error Message:** `TypeError: Artist() takes no arguments`
- **Explanation:** Similar to the 5th test, the constructor is not accepting arguments as expected, leading to a `TypeError`.
4. **7th Unit Test (0/1):**
- **Test Description:** Tests the `Artwork` constructor with default parameter values.
- **Error Message:** `AttributeError: 'Artwork' object has no attribute 'title'`
- **Explanation:** This error points out that the `Artwork` class is missing a `title` attribute when default parameters are used.
### Additional Information:
- Below the unit tests, there is a section labeled "5 previous submissions" with two time stamps: 11:27 AM on 10/24/22 and 11:18 AM on 10/24/22. The submissions scored 3/10 and 0/10 respectively, with an option to view more information.
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