Window 10家庭中文版，Python 3.6.4，
当一个路径以多个斜杠（/）或反斜杠字符（\）结尾时，os.path.isdir(path)函数仍然将它们判断为目录：
>>> os.path.isdir('C:/Python36/Lib/sqlite3//')
True
>>> os.path.isdir('C:/Python36/Lib/sqlite3///')
True
>>> os.path.isdir('C:/Python36/Lib/sqlite3///////')
True
>>> os.path.isdir('C:\Python36\Lib\sqlite3\\\\') # 8个反斜杠（转义后是4个反斜杠 ）
True
孤的判断是返回False的，为何会如此？后续会继续dig~
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Python官文信息：
os.path.isdir(path)
Return True if path is an existing directory. This follows symbolic links, so both islink() and isdir() can be true for the same path.
path-like object
An object representing a file system path. A path-like object is either a str or bytes object representing a path, or an object implementing the os.PathLike protocol. An object that supports the os.PathLike protocol can be converted to a str or bytes file system path by calling the os.fspath() function; os.fsdecode() and os.fsencode() can be used to guarantee a str or bytes result instead, respectively. Introduced by PEP 519.
class os.PathLike
An abstract base class for objects representing a file system path, e.g. pathlib.PurePath.