如何在已安装Python解释器的Linux上更新Python

时间：2023-03-09 16:17:11
如何在已安装Python解释器的Linux上更新Python
1.先删除存在的Python的软链接 
# CD /usr/bin

# sudo  rm python2
2.下载新的Python安装包www.python.org
3.解压下载好的Python-3.x.x.tgz包(具体包名因你下载的Python具体版本不不同⽽而不不同，如：我下载的是Python3.6.8.那我这里就是Python-3.6.8.tgz)
# tar -zvxf python3.6.8.tgz
cd 到python3.6.8目录下
然后依次执行以下代码:
make
# make
make install
make install    或者 make && make install
 
5.建立python3的软链
#sudo ln -s /usr/local/python3/bin/python3  /usr/bin/python3
6.并将/usr/local/python3/bin加入PATH
# vim ~/.bash_profile
# .bash_profile
# Get the aliases and functions

if [ -f ~/.bashrc ]; then

. ~/.bashrc

fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin:/usr/local/python3/bin

export PATH

按ESC，输入:wq 或者 输入：x  回车退出。

修改完记得执行行下面的命令，让上一步的修改生效：
# source ~/.bash_profile
检查Python3及pip3是否正常可用：
# python3 -V

Python 3.6.8
# pip3 -V

pip 18.0.1 from
/usr/local/python3/lib/python3.6/site-packages (python 3.6)
7.不行的话在创建一下pip3的软链接(我也不清楚这一步有什么用)
# ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3

注：

　　

提示找不到SSL模块
python安装完毕后，提示找不到ssl模块：
 
[root@localhost ~]# python2.7.5

Python 2.7.5 (default, Jun 3 2013, 11:08:43)

[GCC 4.1.2 20080704 (Red Hat 4.1.2-54)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> import ssl

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "/usr/local/python27/lib/python2.7/ssl.py", line 60, in <module>

import _ssl # if we can't import it, let the error propagate

ImportError: No module named _ssl

>>>
5.2 重新编译python（去掉最后4行的注释）
#修改Setup文件
vim /root/Python-3.6.5/Modules/Setup.dist
#修改结果如下：
# Socket module helper for socket(2)

_socket socketmodule.c timemodule.c

# Socket module helper for SSL support; you must comment out the other

# socket line above, and possibly edit the SSL variable:

SSL=/usr/local/ssl

_ssl _ssl.c \

-DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \

-L$(SSL)/lib -lssl -lcrypto
5.3 再次编译安装
./configure --prefix=/usr/local/python
make

make install
5.4 测试，已可正常使用。
[root@localhost ~]# python

Python 3.6.4 (default, Jun 3 2013, 14:56:13)

[GCC 4.1.2 20080704 (Red Hat 4.1.2-54)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> import ssl

>>>
 

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