centos解决Could not find a version that satisfies the requirement pip3 (from versions: none)及No matching distribution found for pip3问题

python环境：python 3.8

报错信息：

WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Collecting pip3
  WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/pip3/
  WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/pip3/
  WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/pip3/
  WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/pip3/
  WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/pip3/
  Could not fetch URL https://pypi.org/simple/pip3/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip3/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping
  ERROR: Could not find a version that satisfies the requirement pip3 (from versions: none)
ERROR: No matching distribution found for pip3
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping

安装python 3.8的方法：centos安装httprunner方法

执行命令：

#pip install httprunner

报错：使用pip 命令失败，见顶部“报错信息”

解决办法：升级openssl

1、查看openssl版本

# openssl version

OpenSSL 1.0.1e-fips 11 Feb 2013

# cat /etc/issue               
CentOS release 6.6 (Final)
Kernel \r on an \m

原因：系统版本centos6.6，其中openssl的版本为OpenSSL 1.0.1e-fips 11 Feb 2013,而python3.8需要的openssl的版本为1.0.2或者1.1.x,需要对openssl进行升级，并重新编译python3.8.0。

注意：yum 安装的openssl 版本都比较低。
2、下载openssl
#wget https://www.openssl.org/source/openssl-1.1.1a.tar.gz
#tar -zxvf openssl-1.1.1a.tar.gz
#cd openssl-1.1.1a
3、编译安装
#./config --prefix=/usr/local/openssl no-zlib #不需要zlib
#make && make install
4、备份原配置
#mv /usr/bin/openssl /usr/bin/openssl.bak
#mv /usr/include/openssl/ /usr/include/openssl.bak
5、新版配置
#ln -s /usr/local/openssl/include/openssl /usr/include/openssl
#ln -s /usr/local/openssl/lib/libssl.so.1.1 /usr/local/lib64/libssl.so
#ln -s /usr/local/openssl/bin/openssl /usr/bin/openssl
6、修改系统配置
1）写入openssl库文件的搜索路径
#echo "/usr/local/openssl/lib" >> /etc/ld.so.conf
2）使修改后的/etc/ld.so.conf生效
#ldconfig -v
7、查看openssl版本

# openssl version

OpenSSL 1.1.1a  20 Nov 2018

8、重新安装python

进入python解压缩文件夹，执行
#./configure --prefix=/usr/local/python3 --with-openssl=/usr/local/openssl
#make
#make install

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