builtin-open (PTH123)

Derived from the flake8-use-pathlib linter.

What it does

Checks for uses of the open builtin.

Why is this bad?

pathlib offers a high-level API for path manipulation. When possible, using Path object methods such as Path.open() can improve readability over the open builtin.

Examples

with open("f1.py", "wb") as fp:
    ...

Use instead:

from pathlib import Path

with Path("f1.py").open("wb") as fp:
    ...

References

• Python documentation: Path.open
• Python documentation: open
• PEP 428 – The pathlib module – object-oriented filesystem paths
• Correspondence between os and pathlib
• Why you should be using pathlib
• No really, pathlib is great