Google colaboratory 上下文版本冲突错误，Google colab

我正在尝试在Google colab上安装并运行sunpy。它需要astropy 3.1版或更高版本的软件包。即使在安装astropy 3.2.1版之后，当我导入sunpy时，也会出现以下错误：

ContextualVersionConflict     Traceback (most recent call last)
 <ipython-input-10-1a62dedba559> in <module>()
   ----> 1 import sunpy

5 frames
/usr/local/lib/python3.6/dist-packages/pkg_resources/__init__.py in 
resolve(self, requirements, env, installer, replace_conflicting, 
extras)
789                 # Oops, the "best" so far conflicts with a 
dependency
790                 dependent_req = required_by[req]
--> 791                 raise VersionConflict(dist, 
req).with_context(dependent_req)
792 
793             # push the new requirements onto the stack

ContextualVersionConflict: (astropy 3.0.5 
(/usr/local/lib/python3.6/dist-packages), 
Requirement.parse('astropy>=3.1'), {'sunpy'})

如何解决此问题？

手动安装astropy>=3.1，就像sunpy之前那样：

!pip install astropy>=3.1
!pip install sunpy

然后，使用runtime->restart runtime菜单重新启动运行时以获取新的astropy。最后，导入sunpy

下面是一个成功的例子：

!pip install astropy>=3.1
!pip install sunpy