pip install third-party libraries given as follows:
[root@besttest ld.so.conf.d]# pip3 install xlrd
pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Collecting xlrd
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/xlrd/
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/xlrd/
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/xlrd/
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/xlrd/
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/xlrd/
Could not fetch URL https://pypi.org/simple/xlrd/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/xlrd/ (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 xlrd (from versions: )
No matching distribution found for xlrd
You are using pip version 10.0.1, however version 19.2.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
solution:
pip3 install xlrd -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
Cause: foreign server resources, resulting not been downloaded, plus watercress, watercress source for downloads on the go, faster than in other countries URLs
Other sources Address:
1) http://mirrors.aliyun.com/pypi/simple/ Ali cloud
2) https://pypi.mirrors.ustc.edu.cn/simple/ China University of Science and Technology
3) http://pypi.douban.com/simple/ watercress
4) https://pypi.tuna.tsinghua.edu.cn/simple/ Tsinghua University
5) http://pypi.mirrors.ustc.edu.cn/simple/ University of Science and Technology of China