Auto update Python 2.x to 3.x
阿新 • • 發佈：2021-06-24
1, How to check the python version
importsys
ifsys.version_info < (3.0)
print("python version is 2.x")
else:
print("python version is 3.x")
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2, How to change the default python version
sudorm/usr/bin/python
sudo ln-s/usr/bin/python3.5 /usr/bin/python
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3, How to install python3.x package
sudo apt install python3-pip
sudo pip3 install package
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4,Auto update python2.x to python3.x
http://python-future.org/futurize.html#forwards-conversion
http://python-future.org/automatic_conversion.html
4.1 Install future
sudo pip install future
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4.2 execute cmd
futurize --stage1-w**/*.py
futurize --stage2-w**/*.py
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or
futurize-w**/*.py
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5, Changed lib
| 2.x | 3.x |
|---|---|
| import ConfigParser | import configparser |
| import copy_reg | import copyreg |
| import Queue | import queue |
| import SocketServer | import socketserver |
| import HTMLParser | import html |
| import urllib2 | import urllib |