Windows 上的 python os.path.join 忽略第一个路径元素？
考虑以下内容：
>>> from django.conf import settings
>>> import os
>>> settings.VIRTUAL_ENV
'C:/Users/Marcin/Documents/oneclickcos'
>>> settings.EXTRA_BASE
'/oneclickcos/'
>>> os.path.join(settings.VIRTUAL_ENV,settings.EXTRA_BASE)
'/oneclickcos/'
正如您可以想象的那样，我既不期望也不希望将 'C:/Users/Marcin/Documents/oneclickcos' 和 '/oneclickcos/' 连接起来为'/oneclickcos/'。
奇怪的是，反转路径组件再次显示 python 忽略第一个路径组件：
>>> os.path.join(settings.EXTRA_BASE,settings.VIRTUAL_ENV)
'C:/Users/Marcin/Documents/oneclickcos'
虽然这工作起来与预期类似：
>>> os.path.join('/foobar',settings.VIRTUAL_ENV,'barfoo')
'C:/Users/Marcin/Documents/oneclickcos\\barfoo'
我当然是在 Windows (Windows 7) 上运行，使用本机 python。
为什么会发生这种情况，我该怎么办？
Consider the following:
>>> from django.conf import settings
>>> import os
>>> settings.VIRTUAL_ENV
'C:/Users/Marcin/Documents/oneclickcos'
>>> settings.EXTRA_BASE
'/oneclickcos/'
>>> os.path.join(settings.VIRTUAL_ENV,settings.EXTRA_BASE)
'/oneclickcos/'
As you can imagine, I neither expect nor want the concatenation of 'C:/Users/Marcin/Documents/oneclickcos' and '/oneclickcos/' to be '/oneclickcos/'.
Oddly enough, reversing the path components once again shows python ignoring the first path component:
>>> os.path.join(settings.EXTRA_BASE,settings.VIRTUAL_ENV)
'C:/Users/Marcin/Documents/oneclickcos'
While this works something like expected:
>>> os.path.join('/foobar',settings.VIRTUAL_ENV,'barfoo')
'C:/Users/Marcin/Documents/oneclickcos\\barfoo'
I am of course, running on Windows (Windows 7), with the native python.
Why is this happening, and what can I do about it?
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这几乎就是 os.path.join 的定义方式（引用 文档）：
，我想说这通常是一件好事，因为它避免创建无效路径。如果您想避免这种行为，请不要为其提供绝对路径。是的，以斜线开头的就是绝对路径。一个快速而肮脏的解决方案就是删除前导斜杠（如果您想以编程方式执行此操作，则为
settings.EXTRA_BASE.lstrip('/')）。That's pretty much how
os.path.joinis defined (quoting the docs):And I'd say it's usually a good thing, as it avoids creating invalid paths. If you want to avoid this behavior, don't feed it absolute paths. Yes, starting with a slash qualifies as absolute path. A quick and dirty solution is just removing the leading slash (
settings.EXTRA_BASE.lstrip('/')if you want to do it programmatically).从第二个字符串中删除前导
/：这是因为
os.path.join一旦遇到绝对路径就会丢弃所有先前的组件，而/oneclickos/< /code> 是绝对路径。以下是 os.path.join 文档的摘录：
Remove the leading
/from the second string:This is because
os.path.joindiscards all previous components once it meets an absolute path, and/oneclickos/is an absolute path.Here's an excerpt from the doc of
os.path.join: