Locate the leftmost value exactly equal to x.

    :type array: list
    :param array: an iterable object that support inex

    :param x: a comparable value

    **中文文档**

    返回第一个值等于x的元素的索引。

def find_index(array, x):
    """
    Locate the leftmost value exactly equal to x.

    :type array: list
    :param array: an iterable object that support inex

    :param x: a comparable value

    **中文文档**

    返回第一个值等于x的元素的索引。
    """
    i = bisect.bisect_left(array, x)
    if i != len(array) and array[i] == x:
        return i
    raise ValueError