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背景：
ubuntu 14.04
python3.8
使用pip install pymsql 提示错误：
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Collecting django
WARNING: 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/django/
WARNING: 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/django/
WARNING: 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/django/
WARNING: 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/django/
WARNING: 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/django/
Could not fetch URL https://pypi.org/simple/django/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/django/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.")) - skipping
ERROR: Could not find a version that satisfies the requirement django (from versions: none)
ERROR: No matching distribution found for django
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原因：
因为pip安装第三方库需要ssl模块，而python默认安装ssl功能是不可用的
解决办法是重新编译python3安装文件，加上--with-ssl参数就可以让pip3使用ssl功能了
#重新编译安装 ./configure --enable-optimizations --with-ssl
Ubuntu 16.04 安装（install）python3.8
永久修改pip源
如果需要永久修改pip的软件镜像源，可以通过修改配置文件实现。
在Linux下，修改~/.pip/pip.conf，如果没有则创建：
mkdir ~/.pip vim ~/.pip/pip.conf
添加以下内容
[global] index-url = http://mirrors.aliyun.com/pypi/simple/ [install] trusted-host = mirrors.aliyun.com
或者是：
[global] timeout = 6000 index-url = http://pypi.douban.com/simple/ [install] use-mirrors = true mirrors = http://pypi.douban.com/simple/ trusted-host = pypi.douban.com
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