The `setattr` function in the `MonkeyPatch` class of the `_pytest.monkeypatch` module in Python allows us to set a new value to an attribute of an object or a module during testing. This function is used for monkey-patching, which means modifying an object or a module at runtime to alter its behavior temporarily for testing purposes. The `setattr` function takes three arguments: the target object or module, the name of the attribute to be modified, and the new value to be assigned.
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