Errors/Python

TypeError: Cannot Use Path with Legacy Function

TypeError: expected str, bytes or os.PathLike object, not PosixPath

Quick Answer

The function does not accept pathlib.Path objects. Convert with str(path). Most stdlib functions support Path since Python 3.6.

Why This Happens

pathlib.Path implements os.PathLike since Python 3.6, so most functions accept them. However, some third-party libraries may not. str(path) is a universal fallback.

The Problem

from pathlib import Path
import old_library
old_library.load(Path('/tmp/data.csv'))

The Fix

from pathlib import Path
import old_library
old_library.load(str(Path('/tmp/data.csv')))

Step-by-Step Fix

  1. 1

    Convert to string

    Use str(path) for functions that do not support Path.

  2. 2

    Use os.fspath()

    os.fspath(path) works with any PathLike object.

  3. 3

    Update the library

    Check if a newer version supports Path objects.

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Related Errors

FileNotFoundError: No Such File or Directory

FileNotFoundError: [Errno 2] No such file or directory: 'data.csv'

TypeError: Unsupported Operand Types

TypeError: unsupported operand type(s) for +: 'int' and 'str'