python开发问题

1. pip3

'''
pip3 install --upgrade pip

sudo apt-get install python3-setuptools

pip3 install --upgrade pip
Traceback (most recent call last):
File "/usr/bin/pip3", line 9, in
from pip import main
ImportError: cannot import name 'main'

sudo vim pip3

import sys
from pip import main
if name == 'main':
sys.exit(main())

Change to:

import sys
from pip import main
if name == 'main':
sys.exit(main._main())

'''
2.ModuleNotFoundError: No module named '_sqlite3'

>>>sudo apt-get install libsqlite3-dev
重新编译和安装Python：

先进入Python源文件目录下，例如我的是Python-3.6.2
>>>cd Python-3.7.2
>>>./configure
>>>make
>>>sudo make install 

3.Collecting Twisted>=13.1.0 (from scrapy)
Could not find a version that satisfies the requirement Twisted>=13.1.0 (from scrapy) (from versions: )
No matching distribution found for Twisted>=13.1.0 (from scrapy)

sudo apt-get install bzip2 libbz2-dev
>>>cd Python-3.7.2
>>>./configure
>>>make
>>>sudo make install