ubuntu apt-get升级python3.5到python3.6

1.安装软件管理工具

sudo apt-get install software-properties-common

2.添加软件源

sudo add-apt-repository ppa:jonathonf/python-3.6

3更新apt

sudo apt update

4.安装python3.6

sudo apt-get install python3.6

5.验证

root@iZ2vcf47jzvf8ea38o0y8lZ:/usr/bin# python3.6
Python 3.6.8 (default, May  7 2019, 14:58:50) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 

6.修改python3快捷方式

root@iZ2vcf47jzvf8ea38o0y8lZ:/usr/bin# which python3
/usr/bin/python3

cd /usr/bin/

mv python3 python3.bk

ln -s python3.6 python3

7.验证快捷方式

root@iZ2vcf47jzvf8ea38o0y8lZ:/usr/bin# python3
Python 3.6.8 (default, May  7 2019, 14:58:50) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

8.强制重装pip3 解决pip3报错（也可以使用）

root@iZ2vcf47jzvf8ea38o0y8lZ:/usr/bin# pip3 install  https://github.com/CrawlScript/WebCollector-Python/archive/master.zip
Traceback (most recent call last):
  File "/usr/local/bin/pip3", line 7, in <module>
    from pip._internal import main
ModuleNotFoundError: No module named 'pip._internal'

root@iZ2vcf47jzvf8ea38o0y8lZ:/usr/bin#  curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1733k  100 1733k    0     0  79621      0  0:00:22  0:00:22 --:--:-- 81820

root@iZ2vcf47jzvf8ea38o0y8lZ:/usr/bin# python3 get-pip.py --force-reinstall
Looking in indexes: http://mirrors.cloud.aliyuncs.com/pypi/simple/
Collecting pip
  Downloading http://mirrors.cloud.aliyuncs.com/pypi/packages/30/db/9e38760b32e3e7f40cce46dd5fb107b8c73840df38f0046d8e6514e675a1/pip-19.2.3-py2.py3-none-any.whl (1.4MB)
     |████████████████████████████████| 1.4MB 42.6MB/s 
Installing collected packages: pip
  Found existing installation: pip 8.1.1
    Uninstalling pip-8.1.1:
      Successfully uninstalled pip-8.1.1
Successfully installed pip-19.2.3

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