linux下python3、pip3和python2、pip2共存

首先安裝時候遇到了ssl模塊缺失
編譯安裝ssl
下載
wget https://www.openssl.org/source/openssl-1.1.1-pre9.tar.gz
解壓
tar xf openssl-1.1.1-pre9.tar.gz
./config
make
make install

源碼編譯py3
wget https://www.python.org/ftp/python/3.5.6/Python-3.5.6.tar.xz –no-check-certificate
解壓
tar xf Python-3.5.6.tar.xz
cd /tmp/Python-3.5.6
./configure –prefix=/python3 –enable-shared CFLAGS=-fPIC
cd /tmp/Python-3.5.6/Modules
vim Setup(將以下代碼取消註釋、安裝ssl模塊)
_socket socketmodule.c
SSL=/usr/local/ssl
_ssl _ssl.c \
-DUSE_SSL -I(SSL)/include−I$(SSL)/include-I$ (SSL)/include/openssl \
-L$(SSL)/lib -lssl -lcrypto
make && make install

注意：加上–enable-shared和-fPIC之後可以將python3的動態鏈接庫編譯出來,會安裝pip3和setuptools等