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jpsotka
Asked: 2019-07-17 05:56:59 +0800 CST

Astropy 更改用户名后无法下载文件

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我通过以下线程更改了我的用户名：如何更改我的用户名？

这是几周前的事，我刚刚遇到了第一个问题，Astropy (for python 2.7) 在下载文件时遇到问题，因为它在错误的缓存文件夹中查找。错误消息：IOError: [Errno 2] No such file or directory: u'/home/jill/.astropy/cache/download/py2/bf6211066f3d9a9b058d46183baba6ab' 。（我的旧用户名是 jill，我可以看到这个文件存在于我的新主文件夹中）。

逐行调试后，似乎错误来自“搁置”模块。如，这是 /home/jill 首次在 url 中引入的地方。

我尝试重新安装 python（sudo apt-get install --reinstall python2.7）并重新安装 astropy（pip2 卸载 astropy，pip2 安装 astropy）。

* Pycharm 上的完整错误信息：

File "/home/jpsotka/Dropbox/Colibri/Simulation/corrections.py", line 74, in get_zenith
    elginfield_altaz = ecliptic(lat=elat*u.degree, lon=elon*u.degree).transform_to(AltAz(obstime=time, location=elginfield))

 File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/coordinates/baseframe.py", line 934, in transform_to
    return trans(self, new_frame)

File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/coordinates/transformations.py", line 1314, in __call__
    curr_coord = t(curr_coord, curr_toframe)

 File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/coordinates/transformations.py", line 914, in __call__
    return supcall(fromcoord, toframe)

 File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/coordinates/builtin_frames/cirs_observed_transforms.py", line 53, in cirs_to_altaz
    xp, yp = get_polar_motion(obstime)

 File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/coordinates/builtin_frames/utils.py", line 43, in get_polar_motion
    xp, yp, status = iers.IERS_Auto.open().pm_xy(time, return_status=True)

 File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/utils/iers/iers.py", line 600, in open
    cls.iers_table = cls.read(file=filename)

 File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/utils/iers/iers.py", line 456, in read
    iers_a = Table.read(file, format='cds', readme=readme)

  File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/table/table.py", line 2521, in read
    out = io_registry.read(cls, *args, **kwargs)

 File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/io/registry.py", line 531, in read
    data = reader(*args, **kwargs)

 File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/io/ascii/connect.py", line 39, in io_read
    return read(filename, format=format, **kwargs)

File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/io/ascii/ui.py", line 353, in read
    dat = reader.read(table)

File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/io/ascii/cds.py", line 322, in read
    return super(Cds, self).read(table)

File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/io/ascii/core.py", line 1159, in read
    self.lines = self.inputter.get_lines(table)

File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/io/ascii/core.py", line 296, in get_lines
    encoding=self.encoding) as fileobj:

File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
    return self.gen.next()

  File "/home/jpsotka/.local/lib/python2.7/site-packages/astropy/utils/data.py", line 206, in get_readable_fileobj
    fileobj = open(name_or_obj, 'rb')

IOError: [Errno 2] No such file or directory: u'/home/jill/.astropy/cache/download/py2/bf6211066f3d9a9b058d46183baba6ab'

Process finished with exit code 1
python username

2 个回答

  1. 我知道没有办法完全避免这种情况，即让 Python 跳过不存在的缓存。但是，有一种简单的方法可以让您的程序再次运行，那就是让它看起来/home/jill文件夹中有缓存（或任何资源）。您可以通过创建一个名为/home/jill(real) 的符号链接来做到这一点/home/jpsotka：

    sudo ln -s /home/jpsotka /home/jill

    就这样。当然，如果jill系统中有其他用户，则该目录/home/jill已经存在，因此无法创建链接。

    估计过一会缓存里的文件会被完全替换掉，可以去掉链接：

    sudo rm /home/jill

    请注意，这不会删除 链接指向的文件夹，只是删除链接本身。

    • 1
  2. Best Answer

    如果您使用的是 astropy 1.0.10 或更高版本，这应该会毫无问题地清除缓存：

    #! /usr/bin/env python
from astropy.utils import data
data.clear_download_cache()

    文档链接：

    astropy.utils.data.clear_download_cache(hashorurl=None)

    [资源]

    通过删除本地文件来清除数据文件缓存。

    参数： hashorurl : str或None

    如果没有，则清除整个缓存。否则，要么指定应该删除的缓存文件的哈希值，要么指定应该从缓存中删除的 URL（如果存在）。

    https://docs.astropy.org/en/stable/api/astropy.utils.data.clear_download_cache.html

    链接到相关的错误和拉取请求：

    https://github.com/astropy/astropy/issues/4427

    https://github.com/astropy/astropy/pull/4810

    • 1

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