第一章、环境准备

资源下载：https://www.python.org/downloads/

环境Centos7.8，window10。

下载python3.0稳定版：wget https://www.python.org/ftp/python/3.7.12/Python-3.7.12.tgz
tar -zxvf Python-3.7.12.tgz
cd Python-3.7.12.tgz
./configure --prefix=/usr/local/python3

重新执行：/configure --prefix=/usr/local/python3 --enable-optimizations --enable-shared

make&&make install

重新编译：/configure --prefix=/usr/local/python3，再次make



备份原来的python2.7文件：
mv /bin/python /bin/python2.7.5

修改受影响的yum文件：
vim /usr/bin/yum修改：#!/usr/bin/python为#!/usr/bin/python2.7

vim /usr/libexec/urlgrabber-ext-down//同上修改

ln -s /usr/local/python3/bin/python3.7 /bin/python3
ln -s /usr/local/python3/bin/pip3.7 /usr/bin/pip3

验证：python3 -V //报错如下：
error while loading shared libraries: libpython3.7m.so.1.0: cannot open shared object file: No such file or directory
有2种解决办法：
1）编辑/etc/ld.so.conf，将libpython3.7m.so.1.0的位置写入文件后，执行ldconfig
2）软连接：ln -s /usr/local/python3/lib/libpython3.7m.so.1.0 /usr/local/lib/libpython3.7m.so.1.0，然后ldconfig