Can't connect to HTTPS URL because the SSL module is not available. - skipping

今天用pip3安装第三方库的时候报了这样一个错：

　　Can't connect to HTTPS URL because the SSL module is not available. - skipping

[root@python_test ~]# rpm -qa openssl　　# 检查了一下是安装了openssl的
openssl-1.0.1e-57.el6.x86_64

于是我将原先编译安装好的python目录删除后，重新编译安装：

[root@python_test tools]# tar xf Python-3.6.3.tgz
[root@python_test Python-3.6.3]# ./configure --prefix=/usr/local/python3.6.3 --with-ssl　　　　# pip3会用到ssl模块，之前没有指定所以该功能不能使用
[root@python_test Python-3.6.3]# make && make install

最后测试发现已经可以了：

[root@pygame ~]# pip3 install pygame
Collecting pygame
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fb129etRyf5a20>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /simple/pygame/
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fb129fWER12128>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /simple/pygame/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fb129ef5WER5c0>: Failed to establish a new connection: [Errno 110] Connection timed out',)': /simple/pygame/
  Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x7fb129eaEWR9cf8>: Failed to establish a new connection: [Errno -2] Name or service not known',)': /packages/b3/5e/fb7c85304ad1fd52008fd25fce97a7f59e6147ae97378afc86cf0f5d9146/pygame-1.9.4-cp36-cp36m-manylinux1_x86_64.whl
  Downloading https://files.pythonhosted.org/packages/b3/5e/fb7c85304ad1fd52008fd25fce97a7f59e6147ae97378afc86cf0f5d9146/pygame-1.9.4-cp36-cp36m-manylinux1_x86_64.whl (12.1MB)
    100% |████████████████████████████████| 12.1MB 61kB/s 
Installing collected packages: pygame
Successfully installed pygame-1.9.4

 然后测试一下ssl模块是否可用：

[root@python_test ~]# python3
Python 3.6.3 (default, Dec 27 2018, 05:50:10) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-23)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> import ssl　　　　# 没报错说明可以用了
>>>