the ssl module in Python is not available错误解决

在使用pip安装pymongo的过程中报错，提示如下：

11 $ pip3 install pymongo
22 pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
33 Collecting pymongo
44   Could not fetch URL https://pypi.python.org/simple/pymongo/: There was a problem confirming the ssl certificate: Can't connect to HTTPS URL because the SSL module is not available. - skipping
55   Could not find a version that satisfies the requirement pymongo (from versions: )
66 No matching distribution found for pymongo

这是由于缺少ssl模块，进入python中验证。

1$ python
2Python 3.7.0a3 (default, Jan 10 2018, 14:36:35)
3[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux
4Type "help", "copyright", "credits" or "license" for more information.
5>>> import ssl
6Traceback (most recent call last):
7  File "<stdin>", line 1, in <module>
8  File "/usr/local/lib/python3.7/ssl.py", line 100, in <module>
9    import _ssl             # if we can't import it, let the error propagate
10ModuleNotFoundError: No module named '_ssl'
11>>>

原因找到：缺少openssl-devel包

1$ rpm -qa | grep openssl
2openssl-1.0.2k-8.el7.x86_64
3xmlsec1-openssl-1.2.20-7.el7_4.x86_64
4openssl-libs-1.0.2k-8.el7.x86_64

解决方法：

1、安装openssl-devel包

$ sudo yum install -y openssl-devel

2、重新编译安装pyhton

修改Setup配置

1$ vi Modules/Setup
2找到
3# Socket module helper for socket(2)
4#_socket socketmodule.c
5
6# Socket module helper for SSL support; you must comment out the other
7# socket line above, and possibly edit the SSL variable:
8#SSL=/usr/local/ssl
9#_ssl _ssl.c \
10#       -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \
11#       -L$(SSL)/lib -lssl -lcrypto
12改为
13# Socket module helper for socket(2)
14_socket socketmodule.c
15
16# Socket module helper for SSL support; you must comment out the other
17# socket line above, and possibly edit the SSL variable:
18#SSL=/usr/local/ssl
19_ssl _ssl.c \
20        -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \
21        -L$(SSL)/lib -lssl -lcrypto

编译安装

./configure &&  sudo make && sudo make install

验证：

1$ python
2Python 3.7.0a3 (default, Jan 10 2018, 15:13:22)
3[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux
4Type "help", "copyright", "credits" or "license" for more information.
5>>> import ssl
6>>>

安装pymongo

1$ sudo /usr/local/bin/pip3 install pymongo
2Collecting pymongo
3  Downloading pymongo-3.6.0.tar.gz (581kB)
4    100% |████████████████████████████████| 583kB 28kB/s
5Installing collected packages: pymongo
6  Running setup.py install for pymongo ... done
7Successfully installed pymongo-3.6.0

安装完成