List Files

1. Update your existing get_files_info function. After the path validation succeeds, iterate over the items in the target directory. For each item, record:

   1. The name
   2. The file size
   3. Whether it's a directory

2. Use that data to build and return a string representing the contents of the target directory. It should use this format:

   - README.md: file_size=1032 bytes, is_dir=False
   - src: file_size=128 bytes, is_dir=True
   - package.json: file_size=1234 bytes, is_dir=False
   

   I've listed some useful standard library functions in the Tips section below.

   The exact file sizes and even the order of files may vary depending on your operating system and file system. Your output doesn't need to match the example byte-for-byte, just the overall format.

3. If any errors are raised by the standard library functions that you call, catch them and instead return a string describing the error. When returning an error string, always prefix it with Error:.

4. Replace the test calls in test_get_files_info.py. When executed directly (uv run test_get_files_info.py) it should run the following function calls and print the results matching the formatting below (not necessarily the exact numbers).

   1. get_files_info("calculator", "."):

      Result for current directory:
        - main.py: file_size=719 bytes, is_dir=False
        - tests.py: file_size=1331 bytes, is_dir=False
        - pkg: file_size=44 bytes, is_dir=True
      

   2. get_files_info("calculator", "pkg"):

      Result for 'pkg' directory:
        - calculator.py: file_size=1721 bytes, is_dir=False
        - render.py: file_size=376 bytes, is_dir=False
      

   3. get_files_info("calculator", "/bin"):

      Result for '/bin' directory:
          Error: Cannot list "/bin" as it is outside the permitted working directory
      

   4. get_files_info("calculator", "../"):

      Result for '../' directory:
          Error: Cannot list "../" as it is outside the permitted working directory
      

   To import from a subdirectory, use this syntax: from DIRNAME.FILENAME import FUNCTION_NAME

   Where DIRNAME is the name of the subdirectory, FILENAME is the name of the file without the .py extension, and FUNCTION_NAME is the name of the function you want to import.

5. Run uv run test_get_files_info.py, and ensure your function works as expected.

Run and submit the CLI tests.

Here are some standard library functions you'll find helpful:

• os.listdir(): List the contents of a directory
• os.path.isdir(): Check if a path points to an existing directory
• os.path.getsize(): Get the size of a file (in bytes)
• .join(): Join a list of strings together with a given separator