Python pip安装icalendar:未找到pytz

我尝试在本地pypi服务器上安装icalendar：

第一次尝试失败了，现在我知道我需要为pytz使用--pre。但是，仍然找不到依赖关系：

(pypi)pypi@gray:~> pip install --pre  -d packages  pytz
Downloading/unpacking pytz
  Downloading pytz-2013d.tar.bz2 (204kB): 204kB downloaded
Saved ./packages/pytz-2013d.tar.bz2
Running setup.py egg_info for package pytz

  warning: no files found matching '*.pot' under directory 'pytz'
  warning: no previously-included files found matching 'test_zdump.py'
Successfully downloaded pytz
Cleaning up...

现在我尝试安装icalendar：

(pypi)pypi@gray:~> pip install -d packages icalendar
Downloading/unpacking icalendar
  File was already downloaded packages/icalendar-3.5.tar.gz
  Running setup.py egg_info for package icalendar

    warning: no previously-included files matching '*.pyc' found under directory 'src/icalendar'
Downloading/unpacking setuptools (from icalendar)
  File was already downloaded packages/setuptools-1.1.5.tar.gz
  Running setup.py egg_info for package setuptools

Downloading/unpacking python-dateutil (from icalendar)
  File was already downloaded packages/python-dateutil-2.1.tar.gz
  Running setup.py egg_info for package python-dateutil

Downloading/unpacking pytz (from icalendar)
  Could not find a version that satisfies the requirement pytz (from icalendar) (from versions: 2010b, 2012f, 2010e, 2005m, 2011e, 2010l, 2010e, 2009u, 2008c, 2006j,... 2013d, 2013d, 2012h, 2011h, 2013b, 2012d, 2004b)
Cleaning up...
No distributions matching the version for pytz (from icalendar)
Storing complete log in /home/pypi/.pip/pip.log

有什么提示可以解决这个问题吗？

请参阅：

在旧版本中，pytz的编号方案与pip不兼容

---

这改变了。请参见

安装

icalendar

时是否尝试保留

--pre

？是的，这解决了问题。请参阅“我的答案”的链接。