def argmax(iterable):
    """
    Find the first index of the biggest value in the iterable.

    Parameters
    ----------
    iterable : iterable

    Returns
    -------
    argmax : int

    Examples
    --------
    >>> argmax([0, 0, 0])
    0
    >>> argmax([1, 0, 0])
    0
    >>> argmax([0, 1, 0])
    1
    >>> argmax([])
    """
    max_value = None
    max_index = None
    for index, value in enumerate(iterable):
        if max_value is None or max_value < value:
            max_value = value
            max_index = index
    return max_index
