Python 3 course
Python of 3.0 edition , It is often called Python 3000, Or abbreviation Py3k. be relative to Python Earlier versions of , This is a big upgrade . In order not to bring in too much burden ,Python 3.0 Downward compatibility was not considered in the design .
Python Introduction and installation tutorial we are in Python 2.X Version of the tutorial It has been introduced in , I won't repeat here .
You can also click Python2.x And 3.x Version differences To see the difference between the two .
This tutorial is mainly aimed at Python 3.x Version of learning , If you use Python 2.x Please move to Python 2.X Version of the tutorial .
It is officially announced that ,2020 year 1 month 1 day , stop it Python 2 Updates for .
see Python edition
We can in the command window (Windows use win+R call out cmd Run box ) Use the following command to view the Python edition ：
python -V Or python --version
The execution result of the above command is as follows ：
You can also enter Python Interactive programming mode , View version ：
Python 3.3.2 (v3.3.2:d047928ae3f6, May 16 2013, 00:03:43) [MSC v.1600 32 bit (Intel)] on win32 Type "copyright", "credits" or "license()" for more information. >>>
first Python3.x Program
For most programming languages , The first entry programming code is "Hello World！", The following code is used Python output "Hello World！"：
example (Python 3.0+)
Run instance »
You can save the above code in hello.py File and use python Command executes the script file .
$ python3 hello.py
The output result of the above command is ：