Function meta_warning

dask/dataframe/core.py:410–434

Provide an informative message when the user is asked to provide metadata

(df: Any, method: str)

def meta_warning(df: Any, method: str) -> str:
    """
    Provide an informative message when the user is asked to provide metadata
    """
    if is_dataframe_like(df):
        meta_str: object = {k: str(v) for k, v in df.dtypes.to_dict().items()}
    elif is_series_like(df):
        meta_str = (df.name, str(df.dtype))
    else:
        meta_str = None
    msg = (
        "\nYou did not provide metadata, so Dask is running your "
        "function on a small dataset to guess output types. "
        "It is possible that Dask will guess incorrectly.\n"
        "To provide an explicit output types or to silence this message, "
        f"please provide the `meta=` keyword, as described in the {method} function "
        f"that you are using."
    )
    if meta_str:
        msg += (
            "\n"
            f"  Before: .{method}(func)\n"
            f"  After:  .{method}(func, meta={meta_str}\n"
        )
    return msg


def _convert_to_numeric(series, skipna):