Getting Started with Python (i)

I. Modifying the Python version of Linux

Use commands to view Python versions

ls/usr/bin/python*

View the default Python version information

Python--version

1. User-modified version of Python

To modify a Python version for a specific user, simply create an alias in its home directory. Open the user's ~/.BASHRC file and add

Alias python='/usr/bin/python3.4'

Effective: Reload. BASHRC $. ~/.bashrc

2. Download the new Python

(1). Download the source package,，https://www.python.org/ftp/python/

(2). Unzip and enter the source file

(3). Compile and install

./configure
Make all
Make install

(4). View version

/usr/local/bin/python2.7-v

(5). Modify the default Python version

　　mv /usr/bin/python /usr/bin/python2.6

     ln - s / usr / local / bin / python2. 7 / usr / bin / pythonTwo. HelloWorld python internal implementation process Python internal execution process is as follows: (1). Executing a python file if you call to another file, the __pycache__ folder is created in the current directory to hold the PYc file. (2). The interpreter is added at the top of the

#!/usr/bin/env python

(3). Content Encoding (PY2)

At the top of the py2, you need to add the following:

#-*-coding:utf-8 -*-

However, the py3 is brought into the input by default

Getting Started with Python (i)