通过源码安装python3.7
pip install 出现ModuleNotFoundError: No module named ‘_ctypes
或者提示
Can't connect to HTTPS URL because the SSL module is not available. - skipping
这是因为源码编译python3.7时候没有安装依赖或者安装依赖不全
解决方法：
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo apt-get install build-essential python-dev python-setuptools python-pip python-smbus
sudo apt-get install build-essential libncursesw5-dev libgdbm-dev libc6-dev
sudo apt-get install zlib1g-dev libsqlite3-dev tk-dev
sudo apt-get install libssl-dev openssl
sudo apt-get install libffi-dev