如何使用 pytest tmpdir.as_cwd 获取临时路径

Question

在一个python测试函数中

def test_something(tmpdir):
    with tmpdir.as_cwd() as p:
        print('here', p)
        print(os.getcwd())

我原以为 p 而 os.getcwd() 会给出相同的结果。但实际上，p 指向测试文件的目录，而 os.getcwd() 指向预期的临时文件。

这是预期的行为吗？

Answer 1

From the documentation:

You can use the tmpdir fixture which will provide a temporary directory unique to the test invocation, created in the base temporary directory.

然而，getcwd 代表获取当前工作目录，returns 代表您的 python 进程已启动的目录。

Answer 2

看看py.path.as_cwd的文档：

return context manager which changes to current dir during the managed "with" context. On __enter__ it returns the old dir.

因此您观察到的行为是正确的：

def test_something(tmpdir):
    print('current directory where you are before changing it:', os.getcwd())
    # the current directory will be changed now
    with tmpdir.as_cwd() as old_dir:
        print('old directory where you were before:', old_dir)
        print('current directory where you are now:', os.getcwd())
    print('you now returned to the old current dir', os.getcwd())

请记住，您的示例中的 p 不是您要更改到的 "new" 当前目录，而是您更改前的 "old" 目录。

如何使用 pytest tmpdir.as_cwd 获取临时路径

How to get the temporary path using pytest tmpdir.as_cwd

python

pytest

temporary-directory