centos7 python升级python3.7

更新&&安装支撑

更新源&&包

#centos 7 添加阿里云镜像
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum install epel-release
#更新包
yum -y update

安装相关支撑

yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel libffi-devel
yum -y install gcc gcc-c++ kernel-devel

安装

下载解压

cd /usr/local
wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz
tar -xzvf Python-3.7.0.tgz

创建python3.7文件夹
配置安装路径&&编译

mkdir python3.7
cd Python-3.7.0　
./configure --prefix=/usr/local/python3.7
make && make install

更换系统默认的python和pip版本

备份系统旧的python版本
以备接下来yum依赖

mv /usr/bin/python /usr/bin/python2.7
mv /usr/bin/pip /usr/bin/pipold

建立指向新python3和pip3的软链接

ln -s /usr/local/python3/bin/python3.5 /usr/bin/python
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip

检查python和pip版本

python --version
pip --version

更新yum相关设置

因yum依赖python2，故修改文件

vim /usr/bin/yum

把第一行改了

#!/usr/bin/python—改成—> #!/usr/bin/python2.7

emmmm
用yum时可能又会出现另一种报错

Is this ok [y/d/N]: y
Downloading packages:
  File "/usr/libexec/urlgrabber-ext-down", line 28
    except OSError, e:
                  ^
SyntaxError: invalid syntax

解决方法

vim /usr/libexec/urlgrabber-ext-down

将第一行#!/usr/bin/python 改为 #!/usr/bin/python2.7即可

EeeeeeeeeeerroR

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升级新版pip 之后,有可能是与旧版冲突出现的下面的错误

[root@controller bin]# pip -V
Traceback (most recent call last):
  File "/usr/local/bin/pip", line 5, in <module>
    from pip._internal.cli.main import main
ModuleNotFoundError: No module named 'pip._internal.cli'

解决方法

 # 下载安装脚本
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
# 运行安装脚本
sudo python get-pip.py 

然后好了

[root@controller bin]# pip --version
pip 20.0.2 from /usr/local/python3/lib/python3.7/site-packages/pip (python 3.7)

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