Function safe_setitem

xarray/coding/common.py:112–121

(dest, key: Hashable, value, name: T_Name = None)

def safe_setitem(dest, key: Hashable, value, name: T_Name = None):
    if key in dest:
        var_str = f" on variable {name!r}" if name else ""
        raise ValueError(
            f"Key '{key}' already exists in attrs{var_str}, and will not be overwritten. "
            "This is probably an encoding field used by xarray to describe "
            "how a variable is serialized. To proceed, remove this key from "
            "the variable's attributes manually."
        )
    dest[key] = value


def pop_to(