Centos7安裝python3以及後續相容yum

sudo yum install epel-release

## 安裝python3：(python36是python3加一些pip等元件)，可以去掉 -y 檢視

sudo yum install -y python36

[root@lm graduate_work]

# python3 --version

python 3.6.8

[root@lm build]

# whereis python
python: /usr/bin/python /usr/bin/python2.7 /usr/bin/python3.6 /usr/bin/python3.6m /usr/lib/python2.7 /usr/lib/python3.6 /usr/lib64/python2.7 /usr/lib64/python3.6 /etc/python /usr/include/python2.7 /usr/include/python3.6m /usr/share/man/man1/python.1.gz
[root@lm build]
# ll /usr/bin/python
lrwxrwxrwx. 1 root root 7 2月 17 01:36 /usr/bin/python -> python2
[root@lm build]
# ln -s /usr/bin/python3.6 /usr/bin/python
ln: 無法建立符號鏈結"/usr/bin/python"
: 檔案已存在
[root@lm build]
# rm /usr/bin/python
[root@lm build]
# ln -s /usr/bin/python3.6 /usr/bin/python
[root@lm build]
# python --version
python 3.6.8
[root@lm build]
# pip --version
bash: pip: 未找到命令
[root@lm build]
# whereis pip
pip: /usr/bin/pip3.6
[root@lm build]
# ln -s /usr/bin/pip3.6 /usr/bin/pip
[root@lm build]
# pip --version
pip 9.0.3 from /usr/lib/python3.6/site-packages (python 3.6)
[root@lm build]
# yum
file "/usr/bin/yum", line 30
except keyboardinterrupt, e:
^syntaxerror: invalid syntax
[root@lm build]
# vim /usr/bin/yum
[root@lm build]
# cat /usr/bin/yum | head -1
#!/usr/bin/python2.7
downloading packages:
file "/usr/libexec/urlgrabber-ext-down", line 28
except oserror, e:
^syntaxerror: invalid syntax
file "/usr/libexec/urlgrabber-ext-down", line 28
except oserror, e:
^syntaxerror: invalid syntax
由於使用者取消而退出
[root@lm build]
# vim /usr/libexec/urlgrabber-ext-down
[root@lm build]
# cat /usr/libexec/urlgrabber-ext-down | head -1
#! /usr/bin/python2.7
您在 /var/spool/mail/root 中有郵件
[root@lm download]
# cat /var/spool/mail/root
from [email protected] fri mar 12 14:01:01 2021
return-path: 
x-original-to: root
delivered-to: [email protected]
received: by lm.localdomain (postfix, from userid 0)
id 488f220bceb8; fri, 12 mar 2021 14:01:01 +0800 (cst)
from: "(cron daemon)"
to: [email protected]
subject: cron run-parts /etc/cron.hourly
content-type: text/plain; charset=utf-8
auto-submitted: auto-generated
precedence: bulk
x-cron-env: 
x-cron-env: 
x-cron-env: 
x-cron-env: 
x-cron-env: 
x-cron-env: 
x-cron-env: 
x-cron-env: 
x-cron-env: 
message-id: <[email protected]>
date: fri, 12 mar 2021 14:01:01 +0800 (cst)
/etc/cron.hourly/0yum-hourly.cron:
file "/usr/sbin/yum-cron", line 256
except exception, e:
^syntaxerror: invalid syntax
[root@lm download]
# vim /usr/sbin/yum-cron 
[root@lm download]
# cat /usr/sbin/yum-cron | head -n 1 
#!/usr/bin/python2.7 -tt

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