python - 为什么 os.path.join() 在这种情况下不起作用？

Question

下面的代码不会加入，调试时该命令不存储整个路径，而只存储最后一个条目。

os.path.join('/home/build/test/sandboxes/', todaystr, '/new_sandbox/')

当我测试它时，它只存储代码的 /new_sandbox/ 部分。

Answer 1

后面的字符串不应以斜杠开头。如果它们以斜线开头，则它们被视为“绝对路径”，并且它们之前的所有内容都将被丢弃。

引用 Python docs for os.path.join :

If a component is an absolute path, all previous components are thrown away and joining continues from the absolute path component.

注意在 Windows 上，与驱动器号相关的行为，与早期的 Python 版本相比似乎发生了变化:

On Windows, the drive letter is not reset when an absolute path component (e.g., r'\foo') is encountered. If a component contains a drive letter, all previous components are thrown away and the drive letter is reset. Note that since there is a current directory for each drive, os.path.join("c:", "foo") represents a path relative to the current directory on drive C: (c:foo), not c:\foo.