Python 3.6.5是从源代码构建的，并与Python 2.7.5一起安装。
python3 打开python终端，但 pip3 无法安装任何包含SSL错误的软件包。
[root@servername openssl-OpenSSL_1_1_1-pre5]# pip3 install flask
pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Collecting flask
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/flask/
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/flask/
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/flask/
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/flask/
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/flask/
Could not fetch URL https://pypi.python.org/simple/flask/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.python.org', port=443): Max retries exceeded with url: /simple/flask/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.",)) - skipping
Could not find a version that satisfies the requirement flask (from versions: )
No matching distribution found for flask
据观察，python3中未安装SSL模块。但是，SSL在python2中运行良好。是否可以配置python3来引用python2使用的SSL位置？
另外，一个建议是安装openssl-devel。安装时，会检测到以下依赖性问题。
任何使SSL与python3一起使用的建议都很有帮助。
[root@servername openssl-OpenSSL_1_1_1-pre5]# yum install openssl-devel
Loaded plugins: langpacks, rhnplugin, search-disabled-repos
This system is receiving updates from RHN Classic or Red Hat Satellite.
Resolving Dependencies
--> Running transaction check
---> Package openssl-devel.x86_64 1:1.0.1e-42.el7_1.4 will be installed
--> Processing Dependency: openssl-libs(x86-64) = 1:1.0.1e-42.el7_1.4 for package: 1:openssl-devel-1.0.1e-42.el7_1.4.x86_64
--> Processing Dependency: krb5-devel(x86-64) for package: 1:openssl-devel-1.0.1e-42.el7_1.4.x86_64
--> Running transaction check
---> Package krb5-devel.x86_64 0:1.12.2-14.el7 will be installed
--> Processing Dependency: krb5-libs(x86-64) = 1.12.2-14.el7 for package: krb5-devel-1.12.2-14.el7.x86_64
--> Processing Dependency: libverto-devel for package: krb5-devel-1.12.2-14.el7.x86_64
--> Processing Dependency: libcom_err-devel for package: krb5-devel-1.12.2-14.el7.x86_64
--> Processing Dependency: keyutils-libs-devel for package: krb5-devel-1.12.2-14.el7.x86_64
--> Processing Dependency: libselinux-devel for package: krb5-devel-1.12.2-14.el7.x86_64
--> Processing Dependency: libkdb5.so.7()(64bit) for package: krb5-devel-1.12.2-14.el7.x86_64
---> Package openssl-devel.x86_64 1:1.0.1e-42.el7_1.4 will be installed
--> Processing Dependency: openssl-libs(x86-64) = 1:1.0.1e-42.el7_1.4 for package: 1:openssl-devel-1.0.1e-42.el7_1.4.x86_64
--> Running transaction check
---> Package keyutils-libs-devel.x86_64 0:1.5.8-3.el7 will be installed
---> Package krb5-devel.x86_64 0:1.12.2-14.el7 will be installed
--> Processing Dependency: krb5-libs(x86-64) = 1.12.2-14.el7 for package: krb5-devel-1.12.2-14.el7.x86_64
--> Processing Dependency: libkdb5.so.7()(64bit) for package: krb5-devel-1.12.2-14.el7.x86_64
---> Package libcom_err-devel.x86_64 0:1.42.9-7.el7 will be installed
---> Package libselinux-devel.x86_64 0:2.2.2-6.el7 will be installed
--> Processing Dependency: libsepol-devel >= 2.1.9-1 for package: libselinux-devel-2.2.2-6.el7.x86_64
--> Processing Dependency: pkgconfig(libpcre) for package: libselinux-devel-2.2.2-6.el7.x86_64
--> Processing Dependency: pkgconfig(libsepol) for package: libselinux-devel-2.2.2-6.el7.x86_64
---> Package libverto-devel.x86_64 0:0.2.5-4.el7 will be installed
---> Package openssl-devel.x86_64 1:1.0.1e-42.el7_1.4 will be installed
--> Processing Dependency: openssl-libs(x86-64) = 1:1.0.1e-42.el7_1.4 for package: 1:openssl-devel-1.0.1e-42.el7_1.4.x86_64
--> Running transaction check
---> Package krb5-devel.x86_64 0:1.12.2-14.el7 will be installed
--> Processing Dependency: krb5-libs(x86-64) = 1.12.2-14.el7 for package: krb5-devel-1.12.2-14.el7.x86_64
--> Processing Dependency: libkdb5.so.7()(64bit) for package: krb5-devel-1.12.2-14.el7.x86_64
---> Package libsepol-devel.x86_64 0:2.1.9-3.el7 will be installed
---> Package openssl-devel.x86_64 1:1.0.1e-42.el7_1.4 will be installed
--> Processing Dependency: openssl-libs(x86-64) = 1:1.0.1e-42.el7_1.4 for package: 1:openssl-devel-1.0.1e-42.el7_1.4.x86_64
---> Package pcre-devel.x86_64 0:8.32-14.el7 will be installed
--> Processing Dependency: pcre(x86-64) = 8.32-14.el7 for package: pcre-devel-8.32-14.el7.x86_64
--> Finished Dependency Resolution
Error: Package: 1:openssl-devel-1.0.1e-42.el7_1.4.x86_64 (cat-rhel71_x86_64)
Requires: openssl-libs(x86-64) = 1:1.0.1e-42.el7_1.4
Installed: 1:openssl-libs-1.0.1e-51.el7_2.5.x86_64 (@rhel-x86_64-server-7)
openssl-libs(x86-64) = 1:1.0.1e-51.el7_2.5
Available: 1:openssl-libs-1.0.1e-34.el7.x86_64 (cat-rhel71_x86_64)
openssl-libs(x86-64) = 1:1.0.1e-34.el7
Available: 1:openssl-libs-1.0.1e-34.el7_0.3.x86_64 (cat-rhel71_x86_64)
openssl-libs(x86-64) = 1:1.0.1e-34.el7_0.3
Available: 1:openssl-libs-1.0.1e-34.el7_0.4.x86_64 (cat-rhel71_x86_64)
openssl-libs(x86-64) = 1:1.0.1e-34.el7_0.4
Available: 1:openssl-libs-1.0.1e-34.el7_0.6.x86_64 (cat-rhel71_x86_64)
openssl-libs(x86-64) = 1:1.0.1e-34.el7_0.6
Available: 1:openssl-libs-1.0.1e-34.el7_0.7.x86_64 (cat-rhel71_x86_64)
openssl-libs(x86-64) = 1:1.0.1e-34.el7_0.7
Available: 1:openssl-libs-1.0.1e-42.el7.x86_64 (cat-rhel71_x86_64)
openssl-libs(x86-64) = 1:1.0.1e-42.el7
Available: 1:openssl-libs-1.0.1e-42.el7_1.4.x86_64 (cat-rhel71_x86_64)
openssl-libs(x86-64) = 1:1.0.1e-42.el7_1.4
Error: Package: krb5-devel-1.12.2-14.el7.x86_64 (cat-rhel71_x86_64)
Requires: krb5-libs(x86-64) = 1.12.2-14.el7
Installed: krb5-libs-1.13.2-12.el7_2.x86_64 (@rhel-x86_64-server-7)
krb5-libs(x86-64) = 1.13.2-12.el7_2
Available: krb5-libs-1.11.3-49.el7.x86_64 (cat-rhel71_x86_64)
krb5-libs(x86-64) = 1.11.3-49.el7
Available: krb5-libs-1.12.2-14.el7.x86_64 (cat-rhel71_x86_64)
krb5-libs(x86-64) = 1.12.2-14.el7
Error: Package: krb5-devel-1.12.2-14.el7.x86_64 (cat-rhel71_x86_64)
Requires: libkdb5.so.7()(64bit)
Available: krb5-libs-1.11.3-49.el7.x86_64 (cat-rhel71_x86_64)
libkdb5.so.7()(64bit)
Available: krb5-libs-1.12.2-14.el7.x86_64 (cat-rhel71_x86_64)
libkdb5.so.7()(64bit)
Installed: krb5-libs-1.13.2-12.el7_2.x86_64 (@rhel-x86_64-server-7)
~libkdb5.so.8()(64bit)
Error: Package: pcre-devel-8.32-14.el7.x86_64 (cat-rhel71_x86_64)
Requires: pcre(x86-64) = 8.32-14.el7
Installed: pcre-8.32-15.el7_2.1.x86_64 (@rhel-x86_64-server-7)
pcre(x86-64) = 8.32-15.el7_2.1
Available: pcre-8.32-12.el7.x86_64 (cat-rhel71_x86_64)
pcre(x86-64) = 8.32-12.el7
Available: pcre-8.32-14.el7.x86_64 (cat-rhel71_x86_64)
pcre(x86-64) = 8.32-14.el7
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest
答案 0 :(得分：2)
降级依赖项修复了依赖性问题。
yum downgrade pcre krb5-libs openssl-libs openssl
现在，openssl-devel的安装成功了。
yum install openssl-devel
再次重新安装python3（./configure,make和make altinstall）使pip3与ssl一起工作。