.. _bad-open-mode:

bad-open-mode / W1501
=====================

**Message emitted:**

"%s" is not a valid mode for open.

**Description:**

*Python supports: r, w, a[, x] modes with b, +, and U (only with r) options. See https://docs.python.org/3/library/functions.html#open*


**Correct code:**

.. code-block:: python

  def foo(file_path):
      with open(file_path, "r") as file:
          contents = file.read()


**Problematic code:**

.. code-block:: python

  def foo(file_path):
      with open(file_path, "rwx") as file:  # [bad-open-mode]
          contents = file.read()




Created by ``stdlib`` checker