file_handling_exercises.py

# ==========================================
# Python Learning Lab: 07 File Handling
# ==========================================

import os
import json

print("--- Running File Handling Exercises ---")

# Setup folder variables
CURRENT_DIR = os.path.dirname(os.path.abspath(__file__))
TEXT_FILE = os.path.join(CURRENT_DIR, "test_file.txt")
JSON_FILE = os.path.join(CURRENT_DIR, "test_data.json")

# ==========================================
# Challenge 1: Write and Read Text File
# ==========================================
# Write the string "Python File Handling" to a file named `TEXT_FILE`.
# Then, open the file, read the contents, and verify it matches.

def write_and_read():
    # TODO: Open TEXT_FILE in write mode and write text.
    # Use context manager: with open(...) as f:
    with open(TEXT_FILE, "w") as f:
        f.write("Python File Handling")
    
    # TODO: Open TEXT_FILE in read mode and read text.
    with open(TEXT_FILE, "r") as f:
        content = f.read()
    return content

# --- Verification ---
result_text = write_and_read()
assert os.path.exists(TEXT_FILE), "File was not created"
assert result_text.strip() == "Python File Handling", f"Expected 'Python File Handling', got '{result_text}'"
print("✓ Challenge 1 passed!")


# ==========================================
# Challenge 2: JSON Handling
# ==========================================
# Dump the `user_profile` dictionary as JSON to `JSON_FILE`.
# Then, read it back from `JSON_FILE` and load it into a Python dictionary.

user_profile = {
    "username": "ritshea",
    "course": "Python",
    "is_active": True
}

def json_operations():
    # TODO: Write user_profile to JSON_FILE using json.dump()
    with open(JSON_FILE, "w") as f:
        json.dump(user_profile, f)
    
    # TODO: Read JSON_FILE and parse it using json.load()
    with open(JSON_FILE, "r") as f:
        loaded_dict = json.load(f)
    return loaded_dict

# --- Verification ---
loaded_profile = json_operations()
assert os.path.exists(JSON_FILE), "JSON file was not created"
assert loaded_profile == user_profile, f"Parsed JSON dictionary doesn't match original. Got {loaded_profile}"
print("✓ Challenge 2 passed!")


# Clean up test files
if os.path.exists(TEXT_FILE):
    os.remove(TEXT_FILE)
if os.path.exists(JSON_FILE):
    os.remove(JSON_FILE)

print("\n🎉 All tests passed successfully (and clean-up completed)!")