python 安装： WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in

python 安装： WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.

系统CENTOS6.10,安装Python3时遇到了如下问题，在CENTOS7系统上安装时未遇到上述问题。

WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
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感谢狐狸已妖化提供的解决方案
##解决方案如下

1、原因

系统版本centos6.10，其中openssl的版本为OpenSSL 1.0.1e-fips 11 Feb 2013,而python3.7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python3.7.0。yum 安装的openssl 版本都比较低。

2、升级openssl

2.1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
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2.2 编译安装

./config --prefix=/usr/local/openssl no-zlib #不需要zlib
make
make install
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2.3 备份原配置

mv /usr/bin/openssl /usr/bin/openssl.bak
mv /usr/include/openssl/ /usr/include/openssl.bak
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2.4 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
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2.5 修改系统配置

## 写入openssl库文件的搜索路径
echo "/usr/local/openssl/lib" >> /etc/ld.so.conf
## 使修改后的/etc/ld.so.conf生效 
ldconfig -v
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6.查看openssl版本

openssl version
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openssl version 提示：

 /usr/local/openssl/bin/openssl: error while loading shared libraries: libssl.so.1.1: cannot open shared object file: No such file or directory
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假如你的libssl.so.1.1 文件在/usr/local/openssl/lib/下面，可以这样做

ln -s /usr/local/openssl/lib/libssl.so.1.1 /usr/lib64/libssl.so.1.1

ln -s /usr/local/openssl/lib/libcrypto.so.1.1 /usr/lib64/libcrypto.so.1.1
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然后重新安装Python3

./configure --prefix=/usr/local/python3 --with-openssl=/usr/local/openssl
make
make install
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