为什么"pip install tornado“不安装tornado模块？

Question

我正在尝试将tornado安装到我的虚拟环境中，这样我就可以让Jupyter工作了。我尝试过pip install tornado，它似乎可以运行，但它只安装其他模块。我甚至试图卸载tornado，然后尝试重新安装它，但由于它不存在，我甚至无法卸载它。

有没有办法安装tornado这样我就能看到了？我觉得我什么都试过了。有什么建议吗？

Edit1:我应该提一下，更新pip没有做任何事情。

下面的shell输出是我设置虚拟环境并激活它

[ec2-user@ip-172-31-51-121 ~]$ virtualenv venv
New python executable in venv/bin/python2.7
Also creating executable in venv/bin/python
Installing setuptools, pip...done.
[ec2-user@ip-172-31-51-121 ~]$ . venv/bin/activate

然后我们来看一下与pip list一起安装的模块

(venv)[ec2-user@ip-172-31-51-121 ~]$ pip list
You are using pip version 6.0.8, however version 8.1.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
pip (6.0.8)
setuptools (12.0.5)

接下来，我们pip install tornado (并确保我们重新下载它，以防它存在于缓存中)：

(venv)[ec2-user@ip-172-31-51-121 ~]$ pip install tornado --no-cache-dir
You are using pip version 6.0.8, however version 8.1.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting tornado
  Downloading tornado-4.3.tar.gz (450kB)
    100% |################################| 454kB 27.6MB/s
Collecting backports.ssl-match-hostname (from tornado)
  Downloading backports.ssl_match_hostname-3.5.0.1.tar.gz
Collecting singledispatch (from tornado)
  Downloading singledispatch-3.4.0.3-py2.py3-none-any.whl
Collecting certifi (from tornado)
  Downloading certifi-2016.2.28-py2.py3-none-any.whl (366kB)
    100% |################################| 368kB 28.2MB/s
Collecting backports-abc>=0.4 (from tornado)
  Downloading backports_abc-0.4-py2.py3-none-any.whl
Collecting six (from singledispatch->tornado)
  Downloading six-1.10.0-py2.py3-none-any.whl
Installing collected packages: six, backports-abc, certifi, singledispatch, backports.ssl-match-hostname, tornado




  Running setup.py install for backports.ssl-match-hostname
  Running setup.py install for tornado
    building 'tornado.speedups' extension
    gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -I/usr/include/python2.7 -c tornado/speedups.c -o build/temp.linux-x86_64-2.7/tornado/speedups.o
    gcc -pthread -shared build/temp.linux-x86_64-2.7/tornado/speedups.o -L/usr/lib64 -lpython2.7 -o build/lib.linux-x86_64-2.7/tornado/speedups.so
Successfully installed backports-abc-0.4 backports.ssl-match-hostname-3.5.0.1 certifi-2016.2.28 singledispatch-3.4.0.3 six-1.10.0 tornado

使用pip list进行了两次检查，我们仍然没有看到tornado

(venv)[ec2-user@ip-172-31-51-121 ~]$ pip list
You are using pip version 6.0.8, however version 8.1.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
backports-abc (0.4)
backports.ssl-match-hostname (3.5.0.1)
certifi (2016.2.28)
pip (6.0.8)
setuptools (12.0.5)
singledispatch (3.4.0.3)
six (1.10.0)

当然，因为我们看不到它，所以我们不能卸载它。

(venv)[ec2-user@ip-172-31-51-121 ~]$ pip uninstall tornado
You are using pip version 6.0.8, however version 8.1.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Cannot uninstall requirement tornado, not installed

Answer 1

先升级你的pip，试试这个

pip install -U wheel

或

pip install -U wheel
pip install tornado

For info visit github github issue link，在这里你也可以提出这个问题。

Answer 2

我的猜测是，您使用的是不支持Tornado所需的lib64的较旧版本的virtualenv。这个问题应该在升级virtualenv时解决。