Excerpt: https: //blog.csdn.net/love_cjiajia/article/details/82254371
python3.7 installation (to solve the problem of ssl)
1) Installation Preparation
yum -y install zlib zlib-devel
yum -y install bzip2 bzip2-devel
yum -y install ncurses ncurses-devel
yum -y install readline readline-devel
yum -y install openssl openssl-devel
yum -y install openssl-static
yum -y install xz lzma xz-devel
yum -y install sqlite sqlite-devel
yum -y install gdbm gdbm-devel
yum -y install tk tk-devel
2) Installation libressl openssl-devel place
because the system is openssl version 1.0.1, for python3.7 too old, or needs to be updated to openssl1.0.2 libressl2.64 (free) later versions, so here the official website libressl Download libressl source code, compiled library file instead of the system of openssl1.0.1
After the files are decompressed directory libressl-2.8.0
运行： ./config –prefix=/usr/local/ssl
make
make intall
mv /usr/bin/openssl /usr/bin/openssl.bak
mv /usr/include/openssl /usr/include/openssl.bak
ln -s /usr/local/ssl/bin/openssl /usr/bin/openssl
ln -s /usr/local/ssl/include/openssl /usr/include/openssl
cd /etc/ld.so.conf.d
New File
vim libressl-2.8.0.conf
# following line to join the file, and save the
/ usr / local / ssl / lib
ldconfig -v # reload library
Verify that the installation is complete
[root @ testmachine hadoop_software] # OpenSSL Version
libressl 2.8.0
3) Installation python3.7
downloaded from the official website of the source python3.7,
after decompression into the Python-3.7.0
We need to set environment variables before compiling (important)
Export LDFLAGS = "- L / usr / local / ssl / lib"
Export CPPFLAGS = "- the I / usr / local / ssl / the include"
Export PKG_CONFIG_PATH = "/ usr / local / ssl / lib / pkgconfig "
./configure -prefix = / usr / python -enable -shared CFLAGS = -fPIC
occur after running a bunch of information:
Note that the last inspection of ssl, as shown below: 
If the ssl version is too old or not set ssl environment before compilation variable here is not detected in ssl, pip3 after the installation is not available, it is very crucial!
After detection by running
the make
the make the install
ln -s /usr/python/bin/python3 /usr/bin/python3
ln -s /usr/python/bin/pip3 /usr/bin/pip3
Verify python installed correctly
import ssl no error
Reference: http://ju.outofmemory.cn/entry/363322