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open-file-with-context-handler (SIM115)#

Derived from the flake8-simplify linter.

What it does#

Checks for uses of the builtin open() function without an associated context manager.

Why is this bad?#

If a file is opened without a context manager, it is not guaranteed that the file will be closed (e.g., if an exception is raised), which can cause resource leaks.


file = open("foo.txt")

Use instead:

with open("foo.txt") as file: