在Cent0S 7.5下将Python 2.7.5升级到Python 3.6.6后，发现ssl模块不可用，具体详细信息如下所示：
[root@db-server ~]# pip listPackage Version---------- -------pip 19.2.3 setuptools 39.0.1 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
[root@db-server ~]# python -VPython 3.6.6
>>> import sslTraceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/lib/python3.6/ssl.py", line 101, in <module> import _ssl # if we can't import it, let the error propagateModuleNotFoundError: No module named '_ssl'>>> >>> import socket>>> hasattr(socket,"SSL")False>>>
检查发现openssl包已经安装了，然后按照网上的文章，修改Modules/Setup.dist中，找到SSL配置部分，如下截图所示
[root@db-server ~]# yum list installed |grep opensslopenssl.x86_64 1:1.0.2k-19.el7 @base openssl-libs.x86_64 1:1.0.2k-19.el7 @base
# Socket module helper for SSL support; you must comment out the other
# socket line above, and possibly edit the SSL variable:
#SSL=/usr/local/ssl
#_ssl _ssl.c \
# -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \
# -L$(SSL)/lib -lssl -lcrypto
# The crypt module is now disabled by default because it breaks builds
# on many systems (where -lcrypt is needed), e.g. Linux (I believe).
#
# First, look at Setup.config; configure may have set this for you.
#_crypt _cryptmodule.c # -lcrypt # crypt(3); needs -lcrypt on some systems
这里需要取消注释部分（上图红框附近部分的设置），设置SSL路径，但是这个SSL的安装路径在哪里呢？ 我查找了一下，发现openssl的安装路径如下：
[root@db-server ~]# whereis opensslopenssl: /usr/bin/openssl /usr/lib64/openssl /usr/share/man/man1/openssl.1ssl.gz[root@db-server ~]# rpm -ql openssl/etc/pki/CA/etc/pki/CA/certs/etc/pki/CA/crl/etc/pki/CA/newcerts/etc/pki/CA/private/etc/pki/tls/certs/Makefile/etc/pki/tls/certs/make-dummy-cert/etc/pki/tls/certs/renew-dummy-cert/etc/pki/tls/misc/CA/etc/pki/tls/misc/c_hash/etc/pki/tls/misc/c_info/etc/pki/tls/misc/c_issuer/etc/pki/tls/misc/c_name/usr/bin/openssl/usr/share/doc/openssl-1.0.2k/usr/share/doc/openssl-1.0.2k/FAQ/usr/share/doc/openssl-1.0.2k/NEWS/usr/share/doc/openssl-1.0.2k/README/usr/share/doc/openssl-1.0.2k/README.FIPS/usr/share/doc/openssl-1.0.2k/README.legacy-settings/usr/share/licenses/openssl-1.0.2k/usr/share/licenses/openssl-1.0.2k/LICENSE/usr/share/man/man1/asn1parse.1ssl.gz/usr/share/man/man1/ca.1ssl.gz/usr/share/man/man1/ciphers.1ssl.gz/usr/share/man/man1/cms.1ssl.gz/usr/share/man/man1/crl.1ssl.gz/usr/share/man/man1/crl2pkcs7.1ssl.gz/usr/share/man/man1/dgst.1ssl.gz/usr/share/man/man1/dhparam.1ssl.gz/usr/share/man/man1/dsa.1ssl.gz/usr/share/man/man1/dsaparam.1ssl.gz/usr/share/man/man1/dss1.1ssl.gz/usr/share/man/man1/ec.1ssl.gz/usr/share/man/man1/ecparam.1ssl.gz/usr/share/man/man1/enc.1ssl.gz/usr/share/man/man1/errstr.1ssl.gz/usr/share/man/man1/gendsa.1ssl.gz/usr/share/man/man1/genpkey.1ssl.gz/usr/share/man/man1/genrsa.1ssl.gz/usr/share/man/man1/md2.1ssl.gz/usr/share/man/man1/md4.1ssl.gz/usr/share/man/man1/md5.1ssl.gz/usr/share/man/man1/mdc2.1ssl.gz/usr/share/man/man1/nseq.1ssl.gz/usr/share/man/man1/ocsp.1ssl.gz/usr/share/man/man1/openssl.1ssl.gz/usr/share/man/man1/pkcs12.1ssl.gz/usr/share/man/man1/pkcs7.1ssl.gz/usr/share/man/man1/pkcs8.1ssl.gz/usr/share/man/man1/pkey.1ssl.gz/usr/share/man/man1/pkeyparam.1ssl.gz/usr/share/man/man1/pkeyutl.1ssl.gz/usr/share/man/man1/req.1ssl.gz/usr/share/man/man1/ripemd160.1ssl.gz/usr/share/man/man1/rsa.1ssl.gz/usr/share/man/man1/rsautl.1ssl.gz/usr/share/man/man1/s_client.1ssl.gz/usr/share/man/man1/s_server.1ssl.gz/usr/share/man/man1/s_time.1ssl.gz/usr/share/man/man1/sess_id.1ssl.gz/usr/share/man/man1/sha.1ssl.gz/usr/share/man/man1/sha1.1ssl.gz/usr/share/man/man1/sha224.1ssl.gz/usr/share/man/man1/sha256.1ssl.gz/usr/share/man/man1/sha384.1ssl.gz/usr/share/man/man1/sha512.1ssl.gz/usr/share/man/man1/smime.1ssl.gz/usr/share/man/man1/speed.1ssl.gz/usr/share/man/man1/spkac.1ssl.gz/usr/share/man/man1/sslpasswd.1ssl.gz/usr/share/man/man1/sslrand.1ssl.gz/usr/share/man/man1/ts.1ssl.gz/usr/share/man/man1/verify.1ssl.gz/usr/share/man/man1/version.1ssl.gz/usr/share/man/man1/x509.1ssl.gz/usr/share/man/man5/config.5ssl.gz/usr/share/man/man5/openssl.cnf.5ssl.gz/usr/share/man/man5/x509v3_config.5ssl.gz/usr/share/man/man7/des_modes.7ssl.gz
尝试了几个路径，例如SSL=/usr/lib64/openssl ，然后重新编译安装Python，发现依然报错，
[root@db-server Python-3.6.6]# vi Modules/Setup.dist
SSL=/usr/lib64/openssl
_ssl _ssl.c \
-DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \
-L$(SSL)/lib -lssl -lcrypto
#cd /tmp/Python-3.6.6
#./configure --prefix=/usr/local
#make
#make install
在Python的解压安装包里面，我查了一下setup.py , 搜索ssl关键字，发现有如下一些代码， 但是我在系统搜索了一下，居然找不到这些目录（ssl/include和/ssl/lib）和ssl.h这些文件。
[root@db-server ~]# vi /tmp/Python-3.6.6/setup.py # Detect SSL support for the socket module (via _ssl) search_for_ssl_incs_in = [ '/usr/local/ssl/include', '/usr/contrib/ssl/include/' ] ssl_incs = find_file('openssl/ssl.h', inc_dirs, search_for_ssl_incs_in ) if ssl_incs is not None: krb5_h = find_file('krb5.h', inc_dirs, ['/usr/kerberos/include']) if krb5_h: ssl_incs += krb5_h ssl_libs = find_library_file(self.compiler, 'ssl',lib_dirs, ['/usr/local/ssl/lib', '/usr/contrib/ssl/lib/' ] )
if (ssl_incs is not None and ssl_libs is not None): exts.append( Extension('_ssl', ['_ssl.c'], include_dirs = ssl_incs, library_dirs = ssl_libs, libraries = ['ssl', 'crypto'], depends = ['socketmodule.h']), ) else: missing.append('_ssl')
[root@db-server ~]# ls -lrt /usr/lib64/openssltotal 0drwxr-xr-x. 2 root root 218 Sep 20 07:00 engines
[root@db-server ~]# ls /usr/local/sslls: cannot access /usr/local/ssl: No such file or directory
[root@db-server ~]# find / -name ssl.h
后面才搞清楚，openssl包只包含了可执行部分，openssl-devel才包含了头文件、头文件参考、某些库文件等以及跟开发相关的东西。所以只安装了openssl包是找不到相应的头文件的，安装完openssl-devel之后，验证确认这些目录和文件已经存在了。
[root@db-server ~]# rpm -qa | grep openssl-devel[root@db-server ~]# rpm -qa | grep opensslopenssl-1.0.2k-19.el7.x86_64openssl-libs-1.0.2k-19.el7.x86_64
[root@db-server ~]# yum list installed |grep openssl-devel[root@db-server ~]# yum list installed |grep opensslopenssl.x86_64 1:1.0.2k-19.el7 @base openssl-libs.x86_64 1:1.0.2k-19.el7 @base [root@db-server ~]#
[root@db-server ~]# yum install openssl-devel
使用# rpm -ql openssl-devel 定位安装安装路径为“/usr/include/openssl”，修改安装路径的Modules/Setup.dist文件，修改后的部分如下所示（对比上面截图），然后重新编译安装Python后问题彻底解决。
# Socket module helper for SSL support; you must comment out the other
# socket line above, and possibly edit the SSL variable:
SSL=/usr/include/openssl
_ssl _ssl.c \
-DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \
-L$(SSL)/lib -lssl –lcrypto
参考资料：
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