1.说明
Python long() 函数将数字或字符串转换为一个长整型。
2.语法
class long(x, base=10)
3.参数
x -- 字符串或数字。
base -- 可选，进制数，默认十进制。
4.返回值
返回长整型数。
5.实例
def _is_integer(x): """Determine whether some object ``x`` is an integer type (int, long, etc). This is part of the ``fixes`` module, since Python 3 removes the long datatype, we have to check the version major. Parameters ---------- x : object The item to assess whether is an integer. Returns ------- bool True if ``x`` is an integer type """ return (not isinstance(x, (bool, np.bool))) and \ isinstance(x, (numbers.Integral, int, np.int, np.long, long)) # no long type in python 3
（推荐操作系统：windows7系统、Python 3.9.1，DELL G3电脑。）
