COMP 215 Homework 2: Python Object System

Overview

Implement Java classes that represent Python objects. This forms the foundation of a testing framework for Python programs.

Files to Implement

All files are in skeleton_code/src/main/rice/obj/:

APyObj.java - Abstract base class for all Python objects
PyBoolObj.java - Boolean objects (True/False)
PyIntObj.java - Integer objects
PyFloatObj.java - Float objects
PyCharObj.java - Character objects
AIterablePyObj.java - Abstract base for iterable objects
PyListObj.java - List objects
PySetObj.java - Set objects
PyTupleObj.java - Tuple objects
PyDictObj.java - Dictionary objects
PyStringObj.java - String objects

Requirements

For each PyObj class, implement:

1. Constructor - Initialize with the appropriate Java value 2. getValue() - Return the underlying Java value 3. toString() - Return Python-style string representation: - Booleans: "True" or "False" - Strings: surrounded by single quotes, e.g., 'hello' - Lists: [elem1, elem2] - Tuples: (elem1, elem2) - Sets: {elem1, elem2} - Dicts: {key1: val1, key2: val2} 4. equals(Object) - Check equality with another object 5. hashCode() - Return consistent hash code

Key Design Points

Two APyObj instances are equal if they have the same type AND equal values
Collections must properly handle nested objects
String representation must match Python's format exactly

Testing

Run the grade tool to execute JUnit tests covering:

All primitive types (bool, int, float, char)
All iterable types (list, set, tuple, dict, string)
Mixed/nested structures

Grading

Total: 59 points across multiple test classes

--- *COMP 215: Program Design, Rice University*

APyObj.java73 B

java

package main.rice.obj;

// TODO: implement the abstract APyObj class here

APyObj.java73 B

java

package main.rice.obj;

// TODO: implement the abstract APyObj class here

AIterablePyObj.java592 B

java

package main.rice.obj;

import java.util.Collection;
import java.util.Iterator;
import java.util.stream.Collectors;

/**
 * Abstract base class for iterable Python objects (list, tuple, set, dict, string).
 *
 * @param <T> the element type stored in this iterable
 */
public abstract class AIterablePyObj<T> extends APyObj<Collection<T>> {

    /**
     * Builds a comma-separated string of elements joined with delimiters.
     */
    protected String buildContents() {
        return value.stream()
            .map(Object::toString)
            .collect(Collectors.joining(", "));
    }
}

AIterablePyObj.java592 B

java

package main.rice.obj;

import java.util.Collection;
import java.util.Iterator;
import java.util.stream.Collectors;

/**
 * Abstract base class for iterable Python objects (list, tuple, set, dict, string).
 *
 * @param <T> the element type stored in this iterable
 */
public abstract class AIterablePyObj<T> extends APyObj<Collection<T>> {

    /**
     * Builds a comma-separated string of elements joined with delimiters.
     */
    protected String buildContents() {
        return value.stream()
            .map(Object::toString)
            .collect(Collectors.joining(", "));
    }
}

.mcp.json

diff --git a/.mcp.json b/.mcp.json
deleted file mode 100644
index 917044b..0000000
--- a/.mcp.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "mcpServers": {
-    "bscs-bench": {
-      "command": "/Users/bebe/Code/bscs-bench/bin/bscs-mcp",
-      "args": [
-        "--workspace",
-        "/Users/bebe/Code/bscs-bench/workspaces/comp215_homework2_sonnet"
-      ]
-    }
-  }
-}
\ No newline at end of file

Loading trace...

Duration

2m 25s

Turns

52

Cost

$1.37

Status

Success

API Time

2m 23s

Tokens

1.8M

Claude Code

v2.1.63

Sub-Model Usage

Model	Input	Output	Cache Read	Cost
claude-sonnet-4-6	40	10.2K	1.7M	$1.37

Agent Work: Python Object System

COMP 215 Homework 2: Python Object System

Overview

Files to Implement

Requirements

For each PyObj class, implement:

Key Design Points

Testing

Grading

Sub-Model Usage