UbuntuIn the system, Python version 2.7.x is installed by default, and python command is executed directly. Pthon version 2.7.x will be opened; Python version 3 needs to be installed by itself, and after successful installation, Python 3 will open pyt.Hon 3.x version.
pythonIt is installed in the /usr/bin directory; the python library is installed in /usr/local/lib/python XX. XX is the version number.
This article introduces the installation of Python source code in Ubuntu system:
Official website download source: WGet https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tar.gz
Decompression source package: tar -zxf Python-3.5.2.tar.gz
Compile: CD Python-3.5.2
./configure –prefix=/usr/local # –prefix=/usr/localSpecify installation directory
make && sudo make install
By modifying the soft connection and directly executing the python command, you can open the python 3.x version:
sudo unlink /usr/bin/python
sudo ln –s /usr/bin/python3.5 /usr/bin/python # Specify python3.5 version
UbuntuIn the system, there are two ways to execute Python files:
1. python/python3 test.py When there is Chinese in the python 2 file, you need to add # coding = UTF-8 or # – * – coding: UTF-8 – * – (recommended) at the beginning to solve the problem of unsupported Chinese encoding, but not in the python 3 file.
2. ./test.py In this way, the python file starts with either \!/ usr / bin / Python or !/ usr / bin / Python 3, indicating where the Python interpreter is located.