在Linux系统上安装Python3

一、第一步：先安装openssl

下载：openssl-OpenSSL_1_1_1.tar.gz

tar -zxvf softs/openssl-OpenSSL_1_1_1.tar.gz -C servers/
sudo mkdir -p /usr/local/openssl
cd servers/openssl-OpenSSL_1_1_1
sudo ./config --prefix=/usr/local/openssl shared zlib
sudo make && sudo make install

参考：centos 解决python3.7 安装时No module named _ssl。

二、第二步：安装python3

tar -zxvf softs/Python-3.9.1.tgz -C servers/
sudo mkdir -p /usr/local/python3

修改Modules/Setup：

cd servers/Python-3.9.1
vi Modules/SetupSSL=/usr/local/openssl
_ssl _ssl.c \-DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \-L$(SSL)/lib -lssl -lcryptosudo ln -s /usr/local/openssl/lib/libssl.so.1.1 /usr/lib64/libssl.so.1.1
sudo ln -s /usr/local/openssl/lib/libcrypto.so.1.1 /usr/lib64/libcrypto.so.1.1

执行python安装命令：

sudo ./configure --prefix=/usr/local/python3 --with-openssl=/usr/local/opensslsudo make && sudo make install

然后执行下面命令：

sudo rm -rf /usr/bin/python3
sudo rm -rf /usr/bin/pip3
sudo ln -s /usr/local/python3/bin/python3.9 /usr/bin/python3
sudo ln -s /usr/local/python3/bin/pip3.9 /usr/bin/pip3

三、第三步：验证安装情况

$ python3
>>> import _ssl
>>>