Python 在Nanobox中，pip安装遇到了NewConnectionError。无法使用pip安装程序包。

我为运行Ubuntu 18.04.1的本地计算机安装了nanobox。Nanobox使用本机docker。所以，我安装了Docker版本18.06.1。我能够运行nanobox，它使用boxfile.yml文件告诉nanobox运行python引擎。之后，我尝试使用pip安装新软件包，但它返回了NewConnectionError。我可以在本地计算机上使用pip安装新软件包，但在nanobox中它失败了

dinesh@dinesh-Inspiron-5559:~/Desktop/Test$ nanobox run
Preparing environment :

Test (local) :
  ✓ Restoring App

Preparing environment :

Building dev environment :
  ✓ Starting docker container
  ✓ Configuring


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+ You are in a Linux container
+ Your local source code has been mounted into the container
+ Changes to your code in either the container or desktop will be mirrored
+ If you run a server, access it at >> 172.20.0.5
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/app $ pip install Flask
Collecting Flask
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f2b29152d10>: Failed to establish a new connection: [Errno 113] No route to host',)': /simple/flask/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f2b291525d0>: Failed to establish a new connection: [Errno 113] No route to host',)': /simple/flask/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f2b291521d0>: Failed to establish a new connection: [Errno 113] No route to host',)': /simple/flask/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f2b29159f90>: Failed to establish a new connection: [Errno 113] No route to host',)': /simple/flask/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7f2b29159610>: Failed to establish a new connection: [Errno 113] No route to host',)': /simple/flask/
  Could not find a version that satisfies the requirement Flask (from versions: )
No matching distribution found for Flask

dinesh@dinesh-Inspiron-5559:~/Desktop/Test$nanobox运行
准备环境：
测试（本地）：
✓ 还原应用程序
准备环境：
构建开发环境：
✓ 启动docker容器
✓ 配置
**
********
***************
*********************
*****************
::    *********    ::
::    ***    ::
++   :::   :::   ++
++   :::   ++
++   ++
+
_  _ ____ _  _ ____ ___  ____ _  _
|\ | |__| |\ | |  | |__) |  |  \/
| \| |  | | \| |__| |__) |__| _/\_
--------------------------------------------------------------------------------
+您在一个Linux容器中
+您的本地源代码已装入容器中
+对容器或桌面中的代码所做的更改将被镜像
+如果运行服务器，请访问>>172.20.0.5
--------------------------------------------------------------------------------
/应用程序$pip安装烧瓶
收集瓶
“NewConnectionError（'：无法建立新连接：[Errno 113]没有到主机的路由'，）”：/simple/flash在连接被“NewConnectionError（'：无法建立新连接，”）中断后重试（重试（重试（总计=4，连接=None，读取=None，重定向=None））/
“NewConnectionError（'：无法建立新连接：[Errno 113]没有到主机的路由'，）”：/simple/flash在连接被“NewConnectionError（'：无法建立新连接，”）中断后重试（重试（重试（总计=3，连接=None，读取=None，重定向=None））/
“NewConnectionError（'：未能建立新连接：[Errno 113]没有到主机的路由'，）”：/simple/flask断开连接后重试（重试（总计=2，连接=None，读取=None，重定向=None））/
“NewConnectionError（'：无法建立新连接：[Errno 113]没有到主机的路由'，）”：/simple/flash在连接被“NewConnectionError（'：无法建立新连接，”）中断后重试（重试（重试（总计=1，连接=None，读取=None，重定向=None））/
“NewConnectionError（'：未能建立新连接：[Errno 113]没有到主机的路由'，）”：/simple/flask断开连接后重试（重试（总计=0，连接=None，读取=None，重定向=None））/
找不到满足要求的版本（来自版本：）
未找到烧瓶的匹配分布

你能给我看看你的boxfile.yml吗？